IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
3.3V EEPROM
PROGRAMMABLE CLOCK
GENERATOR
FEATURES:
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IDT5V9888
DESCRIPTION:
Three internal PLLs
Internal non-volatile EEPROM
JTAG and FAST mode I2C serial interfaces
Input Frequency Ranges: 1MHz to 400MHz
Output Frequency Ranges:
− LVTTL: up to 200MHz
− LVPECL/ LVDS: up to 500MHz
Reference Crystal Input with programmable oscillator gain and
programmable linear load capacitance
− Crystal Frequency Range: 8MHz to 50MHz
Each PLL has an 8-bit pre-scaler and a 12-bit feedback-divider
10-bit post-divider blocks
Fractional Dividers
Two of the PLLs support Spread Spectrum Generation
capability
I/O Standards:
− Outputs - 3.3V LVTTL/ LVCMOS, LVPECL, and LVDS
− Inputs - 3.3V LVTTL/ LVCMOS
Programmable Slew Rate Control
Programmable Loop Bandwidth Settings
Programmable output inversion to reduce bimodal jitter
Redundant clock inputs with glitchless auto and manual
switchover options
JTAG Boundary Scan
Individual output enable/disable
Power-down mode
3.3V VDD
Available in TQFP and VFQFPN packages
The IDT5V9888 is a programmable clock generator intended for high
performance data-communications, telecommunications, consumer, and
networking applications. There are three internal PLLs, each individually
programmable, allowing for three unique non-integer-related frequencies.
The frequencies are generated from a single reference clock. The
reference clock can come from one of the two redundant clock inputs. A
glitchless automatic or manual switchover function allows any one of the
redundant clocks to be selected during normal operation.
The IDT5V9888 can be programmed through the use of the I2C or JTAG
interfaces. The programming interface enables the device to be programmed when it is in normal operation or what is commonly known as insystem programmable. An internal EEPROM allows the user to save and
restore the configuration of the device without having to reprogram it on
power-up. JTAG boundary scan is also implemented.
Each of the three PLLs has an 8-bit pre-scaler and a 12-bit feedback
divider. This allows the user to generate three unique non-integer-related
frequencies. The PLL loop bandwidth is programmable to allow the user
to tailor the PLL response to the application. For instance, the user can tune
the PLL parameters to minimize jitter generation or to maximize jitter
attenuation. Spread spectrum generation and fractional divides are
allowed on two of the PLLs.
There are 10-bit post dividers on five of the six output banks. Two of the
six output banks are configurable to be LVTTL, LVPECL, or LVDS. The
other four output banks are LVTTL. The outputs are connected to the PLLs
via the switch matrix. The switch matrix allows the user to route the PLL
outputs to any output bank. This feature can be used to simplify and optimize
the board layout. In addition, each output's slew rate and enable/disable
function can be programmed.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
c
2007
Integrated Device Technology, Inc.
OCTOBER 2007
1
DSC 7044/13
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
FUNCTIONAL BLOCK DIAGRAM
XTALOUT
OSC.
XTALIN/REFIN
OUT1
P2 Divider
10-Bit
/2
OUT2
/2
OUT3
P3 Divider
PLL 0
10-Bit
CLKIN
OUT4
P4 Divider
PLL 1
10-Bit
/2
OUT4
PLL 2
OUT5
P5 Divider
SHUTDOWN/OE
10-Bit
(1)
(1)
P6 Divider
EEPROM
10-Bit
GIN4/CLK_SEL
Control Block for
Multi-Purpose I/O, Programming, Features
I 2 C/JTAG
(1)
/2
OUT5
WRITE ENABLE
(1)
/2
OUT6
GOUT0/TDO/
LOSS_LOCK
GIN3/TRST
GIN1/SCLK/TCLK
GIN2/TMS
GIN0/SDAT/TDI
GOUT1/
LOSS_CLKIN
NOTE:
1. OUT4 and OUT5 pairs can be configured to be LVDS, LVPECL, or two single-ended LVTTL outputs. As LVTTL, OUT4 and OUT5 can be configured to be non-inverting.
2
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
VDD
GOUT1/LOSS_CLKIN
3
22
I 2 C/JTAG
XTALIN/REFIN
4
21
GIN4/CLK_SEL
XTALOUT
5
20
GIN1/SCLK/TCLK
OUT1
6
19
GIN0/SDA/TDI
VDD
7
18
GND
17
9
10
11
12
13
14
15
16
GND
OUT4
VDD
OUT6
GND
OUT5
OUT5
8
OUT4
OUT3
VDD
3
23
22
21
GIN2/TMS
GND
2
20
VDD
GOUT1/LOSS_CLKIN
3
19
I 2 C/JTAG
XTALIN/REFIN
4
18
GIN4/CLK_SEL
XTALOUT
5
17
GIN1/SCLK/TCLK
OUT1
6
16
GIN0/SDA/TDI
OUT3
7
15
VDD
GND
8
9
10
11
12
13
14
VFQFPN
TOP VIEW
TQFP
TOP VIEW
GIN3/TRST
WRITE ENABLE
24
SHUTDOWN/OE
OUT2
25
OUT5
23
26
OUT5
2
27
1
GND
GND
28
CLKIN
OUT6
GIN2/TMS
24
GND
25
VDD
26
VDD
27
GOUT0.TDO/LOSS_LOCK
28
OUT4
SHUTDOWN/OE
29
GIN3/TRST
OUT2
30
WRITE ENABLE
GND
31
VDD
GOUT0.TDO/LOSS_LOCK
32
1
OUT4
CLKIN
VDD
PIN CONFIGURATION
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
PIN DESCRIPTION
Pin Name
PF32
Pin#
NL28
Pin#
I/O
Type
Description
CLKIN
1
1
I
LVTTL
Input Clock
XTALIN/REFIN
4
4
I
LVTTL
CRYSTAL_IN - Reference crystal input or external reference clock input
XTALOUT
5
5
O
LVTTL
CRYSTAL_OUT -Reference crystal feedback
GIN0/SDAT/TDI
19
16
I
LVTTL
Multi-purpose inputs. Can be used for Frequency Control, SDAT(I2C), or TDI(JTAG).
GIN1/SCLK/TCK
20
17
I
LVTTL
Multi-Purpose inputs. Can be used for Frequency Control, SCLK(I2C), or TCK(JTAG).
GIN2/TMS
24
21
I
LVTTL(3)
Multi-Purpose inputs. Can be used for Frequency Control or TMS (JTAG).
WRITE ENABLE
27
24
I
LVTTL(3)
Write Enable pin. This pin must be pulled HIGH during normal operation. HIGH =
normal operation, LOW = Enable writing to internal EEPROM.
GIN3/TRST
25
22
I
LVTTL(3)
Multi-Purpose inputs. Can be used for Frequency Control or TRST (JTAG).
GIN4/CLK_SEL
21
18
I
LVTTL(3)
Multi-Purpose inputs. Can be used for Frequency Control or input clock selector.
SHUTDOWN/OE
28
23
I
LVTTL
Enables/disables the outputs or powers down the chip. The SP bit (0x1C) controls the
polarity of the signal to be either active HIGH or LOW. (Default is active HIGH.)
I2C/JTAG
22
19
I
3-level(2)
I2C (HIGH) or MFC Mode (MID) or JTAG Programming (LOW).
(3)
(3)
(3)
OUT1
6
6
O
LVTTL
Configurable clock output 1. Can also be used to buffer the reference clock.
OUT2
29
25
O
LVTTL
Configurable clock output 2
OUT3
8
7
O
LVTTL
OUT4
10
8
OUT4
11
9
OUT5
15
OUT5
Configurable clock output 3
O
(1)
Adjustable
Configurable clock output 4, Single-Ended or Differential when combined with OUT4
O
Adjustable(1)
Configurable complementary clock output 4, Single-Ended or Differential when
combined with OUT4
13
O
Adjustable(1)
Configurable clock output 5, Single-Ended or Differential when combined with OUT5
16
14
O
Adjustable(1)
Configurable complementary clock output 5, Single-Ended or Differential when
combined with OUT5
OUT6
13
11
O
LVTTL
Configurable clock output 6
GOUT0/TDO/LOSS_LOCK
31
27
O
LVTTL
Multi-Purpose Output. Can be programmed to use as PLL LOCK signal, LOSS_LOCK
or TDO in JTAG mode.
GOUT1/LOSS_CLKIN
3
3
O
LVTTL
Multi-Purpose Output. Can be programmed to use as LOSS_CLKIN.
VDD
7,12,17,
23,26,32
10,15,20
28
3.3V Power Supply
GND
2,9,14,
18,30
2,12,26
Ground
(3)
NOTES:
1. Outputs are user programmable to drive single-ended 3.3V LVTTL, differential LVDS, or differential LVPECL interface levels.
2. 3-level inputs are static inputs and must be tied to VDD or GND or left floating. These inputs are internally biased to VDD/2. They are not hot-insertable or over voltage tolerant.
3. The JTAG (TDO, TMS, TCLK, TRST, and TDI) and I2C (SCLK and SDAT) signals share the same pins with GIN signals.
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IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
PLL FEATURES AND DESCRIPTIONS
D0 Divider
VCO
M0 Multiplier
Spread
Spectrum
Modulation
PLL0 Block Diagram
D1 Divider
VCO
M1 Multiplier
Spread
Spectrum
Modulation
PLL1 Block Diagram
D2 Divider
VCO
M2 Multiplier
PLL2 Block Diagram
5
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Pre-Divider (D) Values
Multiplier (M) Values
Programmable Loop Bandwidth
Spread Spectrum
Generation Capability
PLL0
1 - 255
2 - 8190
yes
yes
PLL1
1 - 255
2 - 8190
yes
yes
PLL2
1 - 255
1 - 4095
yes
no
REFERENCE CLOCK INPUT PINS AND
SELECTION
XTAL load cap = 3.5pF + XTALCAP[7:0] * 0.125pF (Eq. 1)
Parameter
XTALCAP
The 5V9888 supports up to two clock inputs. One of the clock inputs (XTALIN/
REFIN) can be driven by either an external crystal or a reference clock. The
second clock input (CLKIN) can only be driven from an external reference clock.
Either clock input can be set as a the primary clock. The primary clock
designation is to establish which is the main reference clock to the PLLs. The
non-primary clock is designated as the secondary clock in case the primary clock
goes absent and a backup is needed. The PRIMCLK bit (0x34) determines
which clock input will be the primary clock. When PRIMCLK bit is "0", it will select
XTALIN/REFIN as the primary, and when "1", it will select CLKIN as the primary.
The two external reference clocks can be manually selected using the GIN4/
CLK_SEL pin, except in Manual Frequency Control (MFC) mode 2, or via
programming by hard wiring the CLK_SEL pin and toggling the PRIMCLK bit.
For more details on the MFC modes, refer to the CONFIGURING MULTIPURPOSE I/Os section. When CLK_SEL is LOW, the primary clock is selected
and when HIGH, the secondary clock is selected. The SM bits (0x34) must be
set to "0x" for manual switchover which is detailed in SWITCHOVER MODES
section.
GIN4/CLK_SEL
Selected Clock Input
L
H
Primary
Secondary
Bits
8
Step
0.125
Min
0
Max
32
Units
pF
When using an external reference clock instead of a crystal on the XTAL/
REFIN pin, the input load capacitors may be completely bypassed. This allows
for the input frequency to be up to 200MHz. When using an external reference
clock, the XTALOUT pin must be left floating, XTALCAP must be programmed
to the default value of "0", and crystal drive strength bit, XDRV (0x06), must
be set to the default value of "11".
CLKIN Pin
CLKIN pin is a regular clock input pin, and can be driven up to 400MHz.
PRE-SCALER, FEEDBACK-DIVIDER, AND
POST-DIVIDER
Each PLL incorporates an 8-bit pre-scaler and a 12-bit feedback divider
which allows the user to generate three unique non-integer-related frequencies.
For output banks OUT2-OUT6, each bank has a 10-bit post-divider. The
following equation governs how the frequency on output banks OUT2-6 is
calculated.
M
FOUT = FIN *( D )
(Eq. 2)
P*2
Where FIN is the reference frequency, M is the total feedback-divider value,
D is the pre-scaler value, P is the total post-divider value, and FOUT is the resulting
output bank frequency. The value 2 in the denominator is due to the divideby-2 on each of the output banks OUT2-6. Note that OUT1 does not have any
type of post-divider. Also, programming any of the dividers may cause glitches
on the outputs.
Crystal Input (XTALIN/REFIN)
The crystal oscillators should be fundamental mode quartz crystals: overtone
crystals are not suitable. Crystal frequency should be specified for parallel
resonance with 50Ω maximum equivalent series resonance.
When the XTALIN/REFIN pin is driven by a crystal, it is important to set the
internal oscillator inverter drive strength and internal tuning/load capacitor
values correctly to achieve the best clock performance. These values are
programmable through either I2C or JTAG interface to allow for maximum
compatibility with crystals from various manufacturers, processes, performances,
and qualities. The internal load capacitors are true parallel-plate capacitors for
ultra-linear performance. Parallel-plate capacitors were chosen to reduce the
frequency shift that occurs when non-linear load capacitance interacts with load,
bias, supply, and temperature changes. External non-linear crystal load
capacitors should not be used for applications that are sensitive to absolute
frequency requirements. The value of the internal load capacitors are determined
by XTALCAP[7:0] bits, (0x07). The load capacitance can be set with a resolution
of 0.125 pF for a total crystal load range of 3.5pF to 35.4pF. Check with the
vendor's crystal load capacitance specification for the exact setting to tune the
internal load capacitor. The following equation governs how the total internal
load capacitance is set.
Pre-Scaler
D[7:0] are the bits used to program the pre-scaler for each PLL, D0 for
PLL0, D1 for PLL1, and D2 for PLL2. The pre-scalers divide down the
reference clock with integer values ranging from 1 to 255. To maintain low jitter,
the divided down clock must be higher than 400KHz; it is best to use the smallest
D divider value possible. If D is set to '0x00', then this will power down the PLL
and all the outputs associated with that PLL.
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IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Feedback-Divider
N[11:0] and A[3:0] are the bits used to program the feedback-divider for PLL0 (N0 and A0) and PLL1 (N1 and A1). If spread spectrum generation is enabled
for either PLL0 or PLL1, then the SS_OFFSET[5:0] bits (0x61, 0x69) would be factored into the overall feedback divider value. See the SPREAD SPECTRUM
GENERATION section for more details on how to configure PLL0 and PLL1 when spread spectrum is enabled. The two PLLs can also be configured for fractional
divide ratios. See FRACTIONAL DIVIDER for more details. For PLL2, only the N[11:0] bits (N2) are used to program its feedback divider and there is no spread
spectrum generation and fractional divides capability. The12-bit feedback-divider integer values range from 1 to 4095.
The following equations govern how the feedback divider value is set. Note that the equations are different for PLL0/PLL1 and PLL2
PLL0 and PLL1:
M = 2*N[11:0] + A[3:0] + 1 + SS_OFFSET[5:0] * 1/64
M = 2*N[11:0] + A[3:0] + 1 (spread spectrum disabled)
(Eq. 3)
(Eq. 4)
A[3:0] = 0000 = -1
= 0001 = 1
= 0010 = 2
= 0011 = 3
.
.
.
= 1111 = 15
Note: A[3:0] < (N[11:0] - 5), must be met when using A. N cannot be programmed with a value of 4, 8, or 16 when using A.
PLL2:
M = N[11:0]
(Eq. 5)
The user can achieve an even or odd integer divide ratio for both PLL0 and PLL1 by setting the A[3:0] bits accordingly and disabling the spread spectrum.
A fractional divide can also be set for PLL0 and PLL1 by using the A[3:0] bits in conjunction with the SS_OFFSET[5:0] bits, which is detailed in the FRACTIONAL
DIVIDER section. Note that the VCO has a frequency range of 10MHz to 1200MHz. To maintain low jitter, it is best to maximize the VCO frequency. For example,
if the reference clock is 100MHz and a 200MHz clock is required, to achieve the best jitter performance, multiply the 100MHz by 12 to get the VCO running at
the highest possible frequency of 1200MHz and then divide it down to get 200MHz. Or if the reference clock is 25MHz and 20MHz is the required clock, multiply
the 25MHz by 40 to get the VCO running at 1000MHz and then divide it down to get 20MHz. If N is set to '0x00', the VCO will slew to the minimum frequency.
Post-Divider
Q[9:0] are the bits used to program the 10-bit post-dividers on output banks OUT2-6. OUT1 bank does not have a 10-bit post-divider or any other postdivide along its path. The 10-bit post-dividers will divide down the output banks' frequency with integer values ranging from 1 to 1023.
There is the option to choose between disabling the post-divider, utilizing a div/1, a div/2, or the 10-bit post-divider by using the PM[1:0] bits. . Each bank,
except for OUT1, has a set of PM bits. When disabling the post-divider, no clock will appear at the outputs, but will remain powered on. The values are listed
in the table below.
P
PM[1:0]
00
01
10
11
P Post-Divider
disabled
div/1
div/2
Q[9:0] + 2 (Eq. 6)
00
01
VCO
To Outputs
/2
/2
10
11
/ (Q+2)
PM[1:0]
Post-Divider Diagram
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IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Note that the actual 10-bit post-divider value has a 2 added to the integer value Q and the outputs are routed through another div/2 block. The post-divider
should never be disabled unless the output bank will never be used during normal operation. The output frequency range for LVTTL outputs are from 4.9KHz
to 200MHz. The output frequency range for LVPECL/LVDS outputs are from 4.9KHz to 500MHz.
SPREAD SPECTRUM GENERATION
PLL0 and PLL1 support spread spectrum generation capability, which users have the option of turning on and off. Spread spectrum profile, frequency, and
spread are fully programmable (within limits). The programmable spread spectrum generation parameters are TSSC[3:0], NSSC[3:0], SS_OFFSET[5:0],
SD[3:0], DITH, and X2 bits. These bits are in the memory address range of 0x60 to 0x67 for PLL0 and 0x68 to 0x6F for PLL1. The spread spectrum generation
on PLL0 & PLL1 can be enabled/disabled using the TSSC[3:0] bits. To enable spread spectrum, set TSSC > '0' and set NSSC, SD[3:0], SD[5:0], and the
A[3:0] in the total M value accordingly. And to disable, set TSSC = '0'.
TSSC[3:0]
These bits are used to determine the number of phase/frequency detector cycles per spread spectrum cycle (ssc) steps. The modulation frequency can be
calculated with the TSSC bits in conjunction with the NSSC bits. Valid TSSC integer values for the modulation frequency range from 5 to 14.
NSSC[3:0]
These bits are used to determine the number of delta-encoded samples used for a single quadrant of the spread spectrum waveform. All four quadrants
of the spread spectrum waveform are mirror images of each other. The modulation frequency is also calculated based off the NSSC bits in conjunction with the
TSSC bits. Valid NSSC integer values range from 1 to 6.
SS_OFFSET[5:0]
These bits are used to program the fractional offset with respect to the nominal M integer value. For center spread, the SS_OFFSET should be set to '0' so
the spread spectrum waveform is about the nominal M (Mnom) value. For down spread, the SS_OFFSET > '0' so the spread spectrum wavform is about the
(Mideal -1 = Mnom) value. The downspread percentage can be thought of in terms of center spread. For example, a downspread of -1% can also be considered
as a center spread of ±0.5% but with Mnom shifted down by one and offset. The SS_OFFSET has integer values ranging from 0 to 63.
SD[3:0]
These bits are used to shape the profile of the spread spectrum waveform. These are delta-encoded samples of the waveform. There are twelve sets of
SD samples for each PLL. The NSSC bits determine how many of these samples are used for the waveform. The sum of these delta-encoded samples (sigmadelta-encoded samples) determine the amount of spread and should not exceed (63 - SS_OFFSET). The maximum spread is inversely proportional to the
nominal M integer value.
DITH
This bit is for dithering the sigma-delta-encoded samples. This will randomize the least-significant bit of the input to the spread spectrum modulator. Set the
bit to '1' to enable dithering.
X2
This bit will double the total value of the sigma-delta-encoded-samples which will increase the amplitude of the spread spectrum waveform by a factor of two.
When X2 is '0', the amplitude remains nominal but if set to '1', the amplitude is increased by x2.
The following equations govern how the spread spectrum is set:
TSSC = TSSC[3:0] + 2
(Eq. 7)
NSSC = NSSC[3:0] * 2
(Eq. 8)
SD[3:0]K = SJ+1(unencoded) - SJ(unencoded) (Eq. 9)
where SJ is the unencoded sample out of a possible 12 and SDK is the delta-encoded sample out of a possible 12.
Amplitude = (2*N[11:0] + A[3:0] + 1) * Spread% / 100
2
if 1 < Amp < 2, then set X2 bit to '1'.
(Eq. 10)
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IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Modulation frequency:
FPFD = FIN / D (Eq. 11)
FVCO = FPFD * MNOM (Eq. 12)
FSSC = FPFD / (4 * Nssc * Tssc)
(Eq. 13)
Spread:
ΣΔ = SD0 + SD1 + SD2 + … + SD11
the number of samples used depends on the NSSC value
ΣΔ ≤ 63 - SS_OFFSET
±Spread% =
ΣΔ * 100
64 * (2*N[11:0] + A{3:0} + 1)
(Eq. 14)
±Max Spread% / 100 = 1 / MNOM or 2 / MNOM (X2=1)
Profile:
Waveform starts with SS_OFFSET, SS_OFFSET + SDJ, SS_OFFSET + SDJ+1, etc.
Spread Spectrum Using Sinusoidal Profile
9
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Example
FIN = 25MHz, FOUT = 100MHz, Fssc = 33KHz with center spread of ±2%. Find the necessary spread spectrum register settings.
Since the spread is center, the SS_OFFSET can be set to '0'. Solve for the nominal M value; keep in mind that the nominal M should be chosen to maximize
the VCO. Start with D = 1, using Eq.10 and Eq.11.
MNOM = 1100MHz / 25MHz = 44
Using Eq.4, we arbitrarily choose N = 20, A = 3. Now that we have the nominal M value, we can determine TSSC and NSSC by using Eq.12.
Nssc * Tssc = 25MHz / (33KHz * 4) = 190
However, using Eq. 7 and Eq.8, we find that the closest value is when TSSC = 14 and NSSC = 6. Keep in mind to maximize the number of samples used
to enhance the profile of the spread spectrum waveform.
Tssc = 14 + 2 = 16
Nssc = 6 * 2 = 12
Nssc * Tssc = 192
Use Eq.14 to determine the value of the sigma-delta-encoded samples.
±2% = ΣΔ * 100
64 * 44
ΣΔ = 56.32
Either round up or down to the nearest integer value. Therefore, we end up with 56 or 57 for sigma-delta-encoded samples. Since the sigma-delta-encoded
samples must not exceed 63 with SS_OFFSET set to '0', 56 or 57 is well within the limits. It is the discretion of the user to define the shape of the profile that
is better suited for the intended application.
Using Eq.14 again, the actual spread for the sigma-delta-encoded samples of 56 and 57 are ±1.99% and ±2.02%, respectively.
Use Eq.10 to determine if the X2 bit needs to be set;
Amplitude = 44 * (1.99 or 2.02) / 100 = 0.44 < 1
2
Therefore, the X2 = '0 '. The dither bit is left to the discretion of the user.
The example above was of a center spread using spread spectrum. For down spread, the nominal M value can be set one integer value lower to 43.
Note that the 5V9888 should not be programmed with TSSC > '0', SS_OFFSET = '0', and SD = '0' in order to prevent an unstable state in the modulator. The
PLL loop bandwidth must be at least 10x the modulation frequency along with higher damping (larger ωuz) to prevent the spread spectrum from being filtered
and reduce extraneous noise. Refer to the LOOP FILTER section for more detail on ωuz. The A[3:0] must be used for spread spectrum, even if the total multiplier
value is an even integer.
FRACTIONAL DIVIDER
There is the option for the feedback-divider to be programmed as a fractional divider for only PLL0 and PLL. By setting TSSC > '0' and SD bits to '0', the
SS_OFFSET bits would determine the fractional divide value. See the SPREAD SPECTRUM GENERATION section for more details on the TSSC, SD, and
SS_OFFSET bits. The following equation governs how the fractional divide value is set.
M = 2*N[11:0] + A[3:0] + 1 + SS_OFFSET[5:0] *1/64
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IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
The spread spectrum parameters such as the modulation frequency and profile will not be enabled nor will it have any impact on the PLL output when the
PLL is programmed for fractional divide.
The following is an example of how to set the fractional divider.
Example
FIN = 20MHz, FOUT1 = 168.75MHz, FOUT2 = 350MHz
Solving for 350MHz using Eq.2 and Eq.3 with PLL0 and spread spectrum off,
350MHz = 20MHz * (M / D)
P*2
For better jitter performance, keep D as small as possible
350MHz * 2 = M = 35
20MHz
P 1
Therefore, we have D = 1, M = 35 (N = 16, A = 2) for PLL0 with P = 1 on output bank4 resulting in 350MHz.
Solving for 168.75MHz with PLL1 and fractional divide enabled:
168.75MHz = 20MHz * (M / D)
P*2
168.75MHz * 2 = M = 16.875 or 33.75
20MHz
P
1
2
The 33.75 value is chosen to achieve the highest VCO frequency possible. Next step is to figure out the setting for the fractional divide using Eq.3.
33.75 = 2*N + A + 1 + SS_OFFSET * 1/64
Integer value 33 can be determined by N and A, thus leaving 0.75 left to be solved.
2*N + A + 1 = 33
SS_OFFSET = 64 * 0.75 = 48
Therefore, we have D=1, M=33.75 (N=15, A=2, SS_OFFSET=48) for PLL1 with P=2 on an output bank resulting in 168.75MHz.
The fractional divider can be determined if it is needed by following the steps in the previous example. Note that the 5V9888 should not be programmed with
TSSC > '0', SS_OFFSET = '0', and SD = '0' in order to prevent an unstable state in the modulator. The A[3:0] must be used and set to be greater than '2' for
a more accurate fractional divide.
11
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
LOOP FILTER
The loop filter for each PLL can be programmed to optimize the jitter performance. The low-pass frequency response of the PLL is the mechanism that dictates
the jitter transfer characteristics. The loop bandwidth can be extracted from the jitter transfer. A narrow loop bandwidth is good for jitter attenuation while a wide
loop bandwidth is best for low jitter generation. The specific loop filter components that can be programmed are the resistor via the RZ[3:0] bits, pole capacitor
via the CZ[3:0] bits, zero capacitor via the CP[3:0] bits, and the charge pump current via the IP[2:0] bits.
The following equations govern how the loop filter is set.
VDD
Ip
UP
To VCO
From PFD
DOWN
Rz
Ip
Cp
Cz
Charge Pump and Loop Filter Configuration
Resistor (Rz) = 0.3KΩ + RZ[3:0] * 1KΩ
(Eq. 15)
Zero capacitor (Cz) = 6pF + CZ[3:0] * 27.2pF (Eq. 16)
Pole capacitor (Cp) = 1.3pF + CP[3:0] * 0.75pF (Eq. 17)
Charge pump current (Ip) = 5 * 2IP[2:0] μA
Parameter
Bits
(Eq. 18)
Step
Min
Max
Units
RZ
4
1
0.3
15.3
KΩ
CZ
4
27.2
6
414
pF
CP
4
0.75
1.3
12.55
pF
IP
3
2
5
640
μA
n
PLL loop filter design is beyond the scope of this datasheet. Refer to design procedures for 3-order charge-pump based PLLs. For the sake of simplicity,
the fastest and easiest way to calculate the PLL loop bandwidth (Fc) given the programmable loop filter parameters is as follows.
PLL Loop Bandwidth:
Charge pump gain (Kφ) = Ip / 2π
(Eq. 19)
VCO gain (KVCO) = 950MHz/V * 2π (Eq. 20)
M = Total multiplier value (See the PRE-SCALERS, FEEDBACK-DIVIDERS, POST-DIVIDERS section for more detail)
ωc = Rz * Kφ * KVCO * Cz (Eq. 21)
M * (Cz + Cp)
Fc = ωc / 2π
(Eq. 22)
Note, the phase/frequency detector frequency (FPFD) is typically seven times the PLL closed-loop bandwidth (Fc) but too high of a ratio will reduce your
phase margin thus compromising loop stability.
12
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
To determine if the loop is stable, the phase margin (ωm) would need to be calculated as follows.
Phase Margin:
ωz = 1 / (Rz * Cz)
ωp = Cz + Cp
Rz * Cz * Cp
(Eq. 23)
(Eq. 24)
φm = (360 / 2π ) * [tan-1(ωc/ ωz) - tan-1(ωc/ ωp)]
(Eq. 25)
To ensure stability in the loop, the phase margin is recommended to be > 60° but too high will result in the lock time being excessively long. Certain loop filter
parameters would need to be compromised to not only meet a required loop bandwidth but to also maintain loop stability.
Example
Fc = 150KHz is the desired loop bandwidth. The total M value is 850. The ratio of ωp/ωc should be at least 4. A rule of thumb that will help to aid the way,
the ωp / ωc ratio should be at least 4. Given Fc and M, an optimal loop filter setting needs to be solved for that will meet both the PLL loop bandwidth and maintain
loop stability.
The charge pump gain should be relatively small as possible to achieve a low loop bandwidth.
Ip = 40uA .
Kφ * KVCO = 950MHz/V * 40uA = 38000A/Vs
Loop Bandwidths
ωc = 2π * Fc = 9.42x105 s-1
ωuz = ωp / ωc = 4
(Eq. 26)
ωc2 = ωp * ωz
(Eq. 27)
ωp = Cz + Cp = ωz (1 + Cz / Cp)
Rz * Cz * Cp
Solving for Cz, Cp, and Rz
Knowing ωc = Rz * Kφ * KVCO * Cz and substituting in the equations from above,
M * (Cz + Cp)
Cz >>> Cp, therefore, we can easily derive Cp to be
Cp = Kφ * KVCO
= 12.60pF
M * ωc2 * ωuz
Similarly for Cz and Rz
Cz = Kφ * KVCO * (ωuz2 - 1) = Cp * (ωuz2 - 1) = 189pF
M * ωc2 * ωuz
Rz =
M * ωc * ωuz2
= 22.48KΩ
Kφ * KVCO * (ωuz2 - 1)
Based on the loop filter parameter equations from above, since there are no possible values of 12.60pF for Cp, 189pF for Cz, and 22.48KΩ for Rz, the next
possible values within the loop filter settings are 12.55pF (CP[3:0]=1111), 196.4pF (CZ[3:0]=0111), and 15.3KΩ (RZ[3:0]=1111), respectively. This loop filter
setting will yield a loop bandwidth of about 102KHz. The phase margin must be checked for loop stability.
φm = (360 / 2π ) * [tan-1 (6.41x105 s-1 / 3.33x105 s-1) - tan-1 (6.41x105 s-1 / 5.54x106 s-1)] = 56°
Although slightly below 60°, the phase margin would be acceptable with a fairly stable loop.
13
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
CONFIGURING THE MULTI-PURPOSE I/Os
The 5V9888 can operate in four distinct modes. These modes are controlled by the MFC bit (0x04) and the I2C/JTAG pin. The general purpose I/O pins
(GIN0, GIN1, GIN2, GIN3, GIN4) have different uses depending on the mode of operation. The four available modes of operation are:
1)
Manual Frequency Control (MFC) Mode for PLL0 Only
2)
Manual Frequency Control (MFC) Mode for all three PLLs
3)
I2C Programming Mode
4)
JTAG Programming Mode
Along with the GINx pins are also GOUTx output pins that can take up a different function depending on the mode of operation. See table below for description.
Multi-Purpose Pins
GIN0
GIN1
GIN2
GIN3
GIN4
GOUT0
GOUT1
Other Signal Functions
SDAT / TDI
SCLK / TCK
TMS
TRST
CLK_SEL
TDO / LOSS_LOCK
LOSS_CLKIN
Signal Description
I C serial data input / JTAG serial data input
I2C clock input / JTAG clock input
JTAG control signal to the TAP controller state machine
JTAG active LOW input to asynchronously reset the BST
Reference clock select between XTALIN/REFIN and CLKIN
JTAG serial data output / Detects loss of PLL lock(1)
Detects loss of the selected clock source(1)
2
NOTE:
1. LOSS_LOCK and LOSS_CLKIN cannot be used as reliable inputs to other devices.
Each PLL's programming registers can store up to four different Dx and Mx configurations in combination with two different P configurations in MFC modes.
The post-divider should never be disabled in any of the two P configurations unless the output bank will never be used during normal operation. The PLL's
loop filter settings also has four different configurations to store and select from. This will be explained in the MODE1 and MODE2 sections. The use of the GINx
pins in MFC mode control the selection of these configurations.
MODE1 - Manual Frequency Control (MFC) Mode for PLL0 Only
In this mode, only the configuration of PLL0 can be changed during operation.. PLL1 and PLL2 have only one fixed configuration in this mode. The GIN0,
GIN1 and GIN2 pins control the selection of up to eight different D0, M0, P, RZ0, CZ0, PZ0, and IP0 stored configurations. GIN3 is not available to users and
GIN4 becomes CLK_SEL pin. The output GOUT0 will become an indicator for loss of PLL lock (LOSS_LOCK).
GOUT1 pin will become an indicator for loss of the selected clock (LOSS_CLKIN).
PLL0 itself only has four different configurations to choose from but in this mode, it borrows two configurations (Config2 and Config3) from both PLL1 and PLL2,
to provide eight different stored configurations. PLL1 and PLL2 will still be fully operational but the default configuration will be Config0. The output banks will
each have two P configurations that can be associated with each of the PLL configurations. Each of the two P configurations has its own set of PM bits (See the
PRE-SCALERS, FEEDBACK-DIVIDERS, POST-DIVIDERS section for more detail on the PM bits). Use the ODIV bit to choose which post-divider configuration
to associate with a specific PLL configuration. For example, if ODIV0_CONFIG0=1, then when Config0 is selected Qx[9:0]_CONFIG1 is selected as the postdivider value to be used. Or if ODIV2_CONFIG3 = 0, then when CONFIG7 is selected, Qx[9:0]_CONFIG0 is selected. Note that there is an ODIVx bit for each
of the PLL configurations. In this way, the post-divider values can change with the configuration.
To enter this mode, users must set MFC bit to "1", and I2C/JTAG pin must be left floating.
GIN2 Pin
0
GIN1 Pin
0
GIN0 Pin
0
PLL0 Configuration Selection (Mode 1)
Configuration 0: D0_CONFIG0, M0_CONFIG0, and ODIV0_CONFIG0
0
0
1
Configuration 1: D0_CONFIG1, M0_CONFIG1, and ODIV0_CONFIG1
0
1
0
Configuration 2: D0_CONFIG2, M0_CONFIG2, and ODIV0_CONFIG2
0
1
1
Configuration 3: D0_CONFIG3, M0_CONFIG3, and ODIV0_CONFIG3
1
0
0
Configuration 4: D1_CONFIG2, M1_CONFIG2, and ODIV1_CONFIG2
1
0
1
Configuration 5: D1_CONFIG3, M1_CONFIG3, and ODIV1_CONFIG3
1
1
0
Configuration 6: D2_CONFIG2, M2_CONFIG2, and ODIV2_CONFIG2
1
1
1
Configuration 7: D2_CONFIG3, M2_CONFIG3, and ODIV2_CONFIG3
14
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
MODE2 - Manual Frequency Control (MFC) Mode for all PLLs
In this mode, the configuration of PLL0, PLL1, and PLL2 can be changed during operation. The GINx pins are used to control the selection of up to four different
Dx, Mx, P, RZx, CZx, CPx, and IPx configurations for each PLL. GIN0 and GIN1 become configuration selection pins for D0 and M0 of PLL0, GIN2 and GIN3
become configuration selection pins for D1 and M1 of PLL1, and GIN3 and GIN4 become configuration selection pins for D2 and M2 of PLL2. The output GOUT0
will become an indicator for loss of PLL lock (LOSS_LOCK). GOUT1 pin will become an indicator for loss of the selected clock (LOSS_CLKIN).
The output banks will have two different P configurations to choose from for each of the four PLL configurations. Each of the two P configurations has its own
set of PM bits (See the PRE-SCALERS, FEEDBACK-DIVIDERS, POST-DIVIDERS section for more detail on the PM bits). Use the ODIV bit to choose which
post-divider configuration to associate with a specific PLL configuration. For example, if ODIV2_CONFIG2=1, then when Config2 is selected Qx[9:0]_CONFIG1
is selected as the post-divider value to be used. Note that there is an ODIVx bit for each of the PLL configurations. In this way, the post-divider values can change
with the configuration.
To enter this mode, users must set MFC bit to "0", and I2C/JTAG pin must be left floating.
GIN1 Pin
0
0
1
1
GIN0 Pin
0
1
0
1
GIN2 Pin
0
1
GIN4 Pin
0
0
1
1
PLL0 Configuration Selection (Mode 2)
Configuration 0
Configuration 1
Configuration 2
Configuration 3
GIN3 Pin
0
1
0
1
PLL2 Configuration Selection (Mode 2)
Configuration 0
Configuration 1
Configuration 2
Configuration 3
PLL1 Configuration Selection (Mode 2)
Configuration 0
Configuration 1
MODE3 - I2C Programming Mode
In this mode, GIN0, GIN1, and GIN4 become SDAT (I2C data), SCLK (I2C clock), and CLK_SEL signal pins, respectively. The output GOUT0 will become
an indicator for loss of PLL lock (LOSS_LOCK). GOUT1 pin will become an indicator for loss of the selected clock (LOSS_CLKIN). GIN2 and GIN3 are not
available to users.
To enter this mode, I2C/JTAG pin must be set HIGH.
MODE4 - JTAG Programming Mode
In this mode, GIN0, GIN1, GIN2, GIN3, and GIN4 will become TDI (JTAG data in), TCK (JTAG clock), TMS (JTAG control signal), TRST (JTAG reset) and
CLK_SEL signal pins, respectively. The output GOUT0 will become JTAG TDO signal, and GOUT1 will be an indicator for loss of the selected clock (LOSS_CLKIN).
To enter this mode, I2C/JTAG pin must be set LOW.
Multi-Purpose pins
GIN0
GIN1
GIN2
GIN3
GIN4
GOUT0
GOUT1
Mode1
GIN0
GIN1
GIN2
n/a
CLK_SEL
LOSS_LOCK
LOSS_CLKIN
Manual Frequency Control modes
Mode2
JTAG
GIN0
TDI
GIN1
TCK
GIN2
TMS
GIN3
TRST
GIN4(1)
CLK_SEL
LOSS_LOCK
TDO
LOSS_CLKIN
LOSS_CLKIN
NOTE:
1. The PLL(s) will lock onto the primary clock and the manual switchover can be controlled by the PRIMCLK bit.
15
I2C
SDAT
SCLK
n/a
n/a
CLK_SEL
LOSS_LOCK
LOSS_CLKIN
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Understanding the GIN Signals
During power up, the part will virtually be in MFC mode2, therefore, the values of GIN3, GIN2, GIN1 and GIN0 will be latched and used for PLL configuration
selection, regardless of the state of the I2C/JTAG pin. GIN4 is not latched, and will assume the LOW state internally when in programming mode. This means
that when in programming mode, the PLL configuration can only be changed by writing directly to the registers of the currently selected configuration. When
in MFC mode 2, configuration 0 or 1 (GIN4=0) should be selected if you do not want to change configurations when entering or leaving programming mode.
The GIN pins should be held LOW during power up to select configuration0 as default.
When not in programming mode, the GIN inputs directly control the selected configuration. The internal GINx signals can be individually disabled via
programming the GINEN bits (0x06). When disabled by setting GINENx to "0", the GINx inputs may be left floating, but during power up, the GIN pins will still
latch. Disabled inputs are interpreted as LOW by the internal state machines. Even if disabled, GIN2, GIN1, GIN0 and GIN3 pins will be enabled if required
for I2C or JTAG programming functions when in programming mode. The CLK_SEL function on the GIN4 pin will be rendered completely non-functional when
disabled.
SHUTDOWN/ENABLE OF OUTPUTS
The SHUTDOWN/OE pin, along with internal bits, controls the enabling/disabling of the output banks. The SHUTDOWN/OE pin can be programmed to function
as an output enable or global shutdown. The polarity of the SHUTDOWN/OE signal pin can be programmed to be either active HIGH or LOW with the SP bit
(0x1C). When SP is "0", the pin becomes active HIGH and when SP is "1", the pin becomes active LOW. The SH bit(0x1C) determines the function of the
SHUTDOWN/OE signal pin. If SH is "1", the signal pin is SHUTDOWN and functions as a global shutdown. This will override the OEx (0x1C), OSx (0x1D),
and PLLSx (0x1E) bits. If SH is "0", the signal pin is OE and functions as an enable/disable of the output banks. If used as an output enable/disable, each
output bank can be individually programmed to be enabled or disabled by the OE pin.by setting OEx bits to "1". If the OE signal pin is asserted, the output banks
that has their corresponding OEx bit set to "1" will be disabled. The OEMx bits determine the outputs' disable state. When set to "0x" the outputs will be tristated.
When set to "10", the outputs will be pulled low. When set to "11", the outputs will be pulled high. Inverted outputs will be parked in the opposite state. If the
OEx bits are set to "0", the states of the corresponding output banks will not be impacted by the state of the OE pin. To individually enable/disable via programming
instead of the OE pin, hard wire the OE pin to Vdd or GND (depending if it is active HIGH or LOW) as if to disable the outputs. Then toggle the OEx bits to either
"0" to enable or "1" to disable.
When the chip is in shutdown, the outputs, the reference oscillator, and the I2C /JTAG pin are powered down. The outputs will be tristated and the I2C
/JTAG pin will be set to MFC mode (MID level). Programming will not be allowed. The GINx pins and clock inputs remain operational. The PLL is not disabled.
The SHUTDOWN pin must be reasserted in order to program the part or to resume operation.
16
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
MANUAL FREQUENCY CONTROL (MFC) BLOCK DIAGRAM
OUTPUT MUX
PLL0
Prescaler "D"
CONFIG0
CONFIG1
VCO
Output Divider P2
CONFIG2
CONFIG3
CONFIG0
CONFIG1
Multiplier "M"
CONFIG0
ODIV
CONFIG1
ODIV
CONFIG2
ODIV
CONFIG3
ODIV
ODIV
Output Divider P3
CONFIG0
CONFIG1
PLL1
ODIV
Prescaler "D"
CONFIG0
CONFIG1
VCO
CONFIG2
CONFIG3
Multiplier "M"
CONFIG0
ODIV
CONFIG1
ODIV
PLL2
Prescaler "D"
CONFIG0
CONFIG1
VCO
CONFIG2
CONFIG3
Multiplier "M"
CONFIG0
ODIV
CONFIG1
ODIV
CONFIG2
ODIV
CONFIG3
ODIV
MFC = 0
NOTES:
This illustration shows how the configurations are arranged for each PLL. There is an ODIV bit associated with each of the four configurations.
- GIN0 and GIN1 control four configurations from PLL0.
- GIN2 controls four configurations from PLL1.
- GIN3 and GIN4 control four configurations from PLL2.
- ODIV from each configuration determines the selection of two Output Divider Px Configurations.
17
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
MANUAL FREQUENCY CONTROL (MFC) BLOCK DIAGRAM
OUTPUT MUX
PLL0
Prescaler "D"
CONFIG0
CONFIG1
VCO
Output Divider P2
CONFIG2
CONFIG3
CONFIG0
CONFIG1
Multiplier "M"
CONFIG0
ODIV
CONFIG1
ODIV
CONFIG2
ODIV
CONFIG3
ODIV
ODIV
Output Divider P3
CONFIG0
CONFIG1
PLL1
ODIV
Prescaler "D"
CONFIG0
VCO
CONFIG4
CONFIG5
Multiplier "M"
CONFIG0
ODIV
CONFIG4
ODIV
CONFIG5
ODIV
PLL2
Prescaler "D"
CONFIG0
VCO
CONFIG6
CONFIG7
Multiplier "M"
CONFIG0
ODIV
CONFIG6
ODIV
CONFIG7
ODIV
MFC = 1
NOTES:
This illustration shows how the configurations are arranged for PLL0. Config_4 and Config_5 are taken from PLL1, and Config_6 and Config_7 are taken from PLL2. There is an
ODIV bit associated with each of the four configurations.
- GIN0, GIN1, and GIN2 control eight shaded configurations for PLL0.
- ODIV from each configuration determines the selection of two Output Divider Px Configurations.
18
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
BLOCK DIAGRAM FOR SHUTDOWN/OE CONTROL SIGNAL
OUT1
PM2
OE1
01
10
/2
Q2
OUT2
/2
11
+2
OE2
01
10
/2
Q3
/2
OUT3
11
+2
OE3
PM3
OUT4
MUX
01
10
/2
Q4
/2
11
+2
OUT4
PM4
OE4
PM5
OUT5
01
10
/2
Q5
/2
11
+2
OUT5
PM6
OE5
01
10
/2
Q6
OUT6
/2
11
+2
OE6
OE MODE
SHUTDOWN/OE
Global SHUTDOWN Mode:
Assert to Shutdown power on the outputs
and 3-Level Pin
SP
SH
NOTE:
This illustration shows the internal logic behind the SHUTDOWN/OE pin and the bits associated with it.
19
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
POWER UP AND POWER SAVING FEATURES
If a global shutdown is enabled, SHUTDOWN pin asserted, most of the chip except for the PLLs will be powered down. Note that the register bits will not lose
their state in the event of a chip power-down. The only possibility that the register bits will lose their state is if the part was power-cycled. After coming out of shutdown
mode, the PLLs will require time to relock.
During power up, the values of GIN3, GIN2, GIN1 and GIN0 will be latched and used for PLL configuration selection, regardless of the state of the I2C/JTAG
pin and GINx being disabled via the GINENx bits. GIN4 will have an internal state of LOW. The GIN pins should be held LOW during power up to select configuration0
as default. The output levels will be at an undefined state during power up.
The post-divider should never be disabled via PM bits after power up, or else it will render the output bank completely non-functional during normal operation,
(unless the output bank itself will not be used at all).
During power up, the VDD ramp must be monotonic.
LOSS OF LOCK AND INPUT CLOCK
The device employs a loss of lock and loss of input clock detection circuitry. The GIN0/LOSS_LOCK and GIN1/LOSS_CLKIN are the outputs that indicate
such failures. LOSS_LOCK signal will be asserted if any of the three powered up PLLs loses frequency lock for any event other than PLL shutdown. Lock
is determined by checking that the reference and feedback clocks are within 1/2 period of each other. LOSS_LOCK is also asserted for at least two clock cycles
of the newly selected clock when switching over to a different clock source (manual or automatic).
LOSS_CLKIN is asserted when the currently selected clock is lost or is asserted when both clocks are lost. In the event of the selected clock being absent
up on power up, the loss of the selected clock detection circuitry will reference an internal oscillator. LOSS_LOCK and LOSS_CLKIN cannot be used as reliable
inputs to other devices.
SWITCHOVER MODES
The IDT5V9888 features redundant clock inputs which supports both Automatic and Manual switchover mode. These two modes are determined by the
configuration bits, SM (0x34). The primary clock source can be programmed, via the PRIMCLK bit, to be either XTALIN/REFIN or CLKIN, which is determined
by the PRIMCLK bit. The other clock source input will be considered as the secondary source. This is more detailed in the 'REFERENCE CLOCK INPUT PINS
AND SELECTION'. Note that the switchover modes are asynchronous. If the reference clocks are directly routed to OUTx with no phase relationship, short
pulses can be generated during switchover. The automatic switchover mode will work only when the primary clock source is XTALIN/REFIN.
MANUAL SWITCHOVER MODE
When SM[1:0] is "0x", the redundant inputs are in manual switchover mode. In this mode, CLK_SEL pin is used to switch between the primary and secondary
clock sources. As previously mentioned, the primary and secondary clock source setting is determined by the PRIMCLK bit. During the switchover, no glitches
will occur at the output of the device, although there may be frequency and phase drift, depending on the exact phase and frequency relationship between the
primary and secondary clocks. The LOSS_LOCK signal will be asserted for a minimum of two input clock cycles of the newly selected clock, even if the two inputs
are exactly in phase. GOUT1 is used as LOSS_CLKIN, which indicates the loss of the currently used selected clock.
AUTOMATIC SWITCHOVER MODE
When SM[1:0] is "1x", the redundant inputs are in automatic switchover mode. Automatic switchover mode supports both revertive and non-revertive
functionalities. These two functions are determined by the SM bits being set to "10" for non-revertive and "11" for revertive.
Non-Revertive
The input clock selection will switch to the secondary clock source when there are no transitions on the primary clock source for two secondary clock cycles.
LOSS_LOCK and LOSS_CLKIN signals will be asserted for a minimum of two secondary clock cycles. LOSS_LOCK will remain asserted until the PLL achieves
lock, as previously defined, to the new input clock. If there are no transitions on both clock sources, the LOSS_LOCK signal and LOSS_CLKIN signal will be
asserted. In this mode, once the secondary clock is selected, it will not automatically re-select the primary clock as the input clock, even if the secondary clock
goes away and the primary clock is functional. The CLK_SEL pin must be toggled to re-select the primary clock source as the input clock.
20
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Revertive
The input clock selection will switch to the secondary clock source when there are no transitions on the primary clock source for two secondary clock cycles.
LOSS_LOCK and LOSS_CLKIN signals will be asserted. LOSS_LOCK will remain asserted until the PLL achieves lock, as previously defined, to the new input
clock. If there are no transitions on both clock sources, the LOSS_LOCK signal and LOSS_CLKIN signal will be asserted. After a stable and valid primary clock
source is present for either 8 or 1024 primary clock cycles, the input clock selection will automatically switch back to the primary clock source and LOSS_CLKIN
signal will be deasserted. The CLK_SEL pin can be left floating in this auto-revertive mode. The OKC bit (0x1D) determines the number of valid primary clock
cycles of either 8 or 1024 before switching back to the primary clock source. If OKC is set to "0", the primary clock will be re-selected as the input clock if the
primary clock is present for 8 primary clock cycles. If OKC is set to "1", the re-select threshold is 1024 primary clock cycles. (Actual switchover times will vary.)
Note that both clock inputs must be at the same frequency in order for the auto-revertive switchover to function properly. If both reference clocks are at different
frequencies, the device will always remain on the primary clock unless it is absent for two secondary clock cycles.
In all switchover modes, LOSS_LOCK signal is asserted for at least two input clock cycles of the newly selected clock when switching clock sources (manually
or automatic).
CLOCK SWITCH MATRIX AND OUTPUTS
All three PLL outputs and the currently selected input clock source are routed into and through a clock matrix. The user is able to select which PLL output and
clock source is routed to which output bank via the SRCx bits (0x34, 0x35). Each output bank has its own set of SRC bits. Refer to the RAM table for more
information. Note that OUT1 will be based off the reference clock and the only output bank toggling under the default RAM bit settings.
Outputs 1, 2 and 3 are 3.3V LVTTL. Outputs banks 4 and 5 can be 3.3V LVTTL, LVPECL or LVDS. The LVDS and LVPECL selection is determined by
the LVLx bits (0x54, 0x58). Each output bank has individual slew-rate control (SLEWx bits). Each output can be individually inverted (INVx bits); when using
LVPECL or LVDS modes, one of the outputs in each LVPECL/LVDS pair should be inverted. All output banks except OUT1 have a programmable 10-bit postdivider (Qx bits) with two selectable divide configurations via the ODIVx bits.
There are four settings for the programmable slew rate, 0.7V/ns, 1.25V/ns, 2V/ns, and 2.75V/ns; this only applies to the 3.3V LVTTL outputs. The differential
outputs are not slew rate programmable in LVPECL or LVDS modes. SLEW4 and/or SLEW5 must be set to 2.75V/ns for stable output operation . For LVTTL
output frequency rates higher than 100MHz, a slew rate of 2V/ns or greater should be selected. The post-dividers can be disabled using the PMx bit, which
is described in the PRE-SCALER, FEEDBACK-DIVIDER, AND POST-DIVIDER section. Each output can also be enabled/disabled, which is described in the
'SHUTDOWN/ENABLE of OUTPUTS' section. Refer to the RAM table for all binary settings.
HIGH LEVEL BLOCK DIAGRAM FOR CONFIGURATION SCHEME
I/Os
I/Os
Non-Volatile
Configuration
PLLs and Control
Blocks
EEPROM
Cell
Volatile
Configuration
I 2C or JTAG
interface
Write Enable
Programming
Interface Block
NOTE: Diagram does not represent actual number of die on chip.
21
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
PROGRAMMING THE DEVICE
I2C and JTAG may be used to program the 5V9888. The I2C/JTAG pin selects the I2C when HIGH and JTAG when LOW. Note that the TRST pin needs
to be LOW for I2C mode.
Hardwired Parameters for the IDT5V9888
JTAG identification number = 32'b0000_0000001110101100_00000110011_1
Device (slave) address = 7'b1101010
ID Byte for the 5V9888 = 8'b00010000
I2C PROGRAMMING
The 5v9888 is programmed through an I2C-Bus serial interface, and is an I2C slave device. The read and write transfer formats are supported. The first
byte of data after a write frame to the correct slave address is interpreted as the register address; this address auto-increments after each byte written or read.
The frame formats are shown below.
SDA
SDA
SCL
SCL
P
S
Data Frame
Data is stable during
clock HIGH
Start
Condition
Stop
Condition
Figure 1: Framing
Each frame starts with a "Start Condition" and ends with an "End Condition". These are both generated by the Master device.
MSB
1
LSB
1
0
1
0
1
0
R/W
7-bit slave address
R/W
0 - Slave will be written by master
1 - Slave will be read by master
ACK from Slave
The first byte transmitted by the Master is the Slave Address followed by the R/W bit.
The Slave acknowledges by sending a "1" bit.
Figure 2: First Byte Transmittetd on I2C Bus
22
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
EXTERNAL I2C INTERFACE CONDITION
KEY:
From Master to Slave
1234
1234
1234 From Master to Slave, but can be omitted if followed by the correct sequence
Normally data transfer is terminated by a STOP condition generated by the Master. However, if the Master still wishes to communicate on the bus, it can
generate a repeated START condition, and address another Slave address without first generating a STOP condition.
From Slave to Master
SYMBOLS:
ACK - Acknowledge (SDA LOW)
NACK - Not Acknowledge (SDA HIGH)
Sr - Repeated Start Condition
S - START Condition
P - STOP Condition
PROGWRITE
S
Address
R/W
7-bits
0
ACK Command Code ACK
1-bit
8-bits: xxxxxx00
1-bit
Register
ACK
8-bits
1-bit
Data ACK
8-bits
P
1-bit
Figure 3: Progwrite Command Frame
Writes can continue as long as a Stop condition is not sent and each byte will increment the register address.
PROGREAD
Note: If the expected read command is not from the next higher register to the previous read or write command, then set a known "read" register address
prior to a read operation by issuing the following command:
S
Address
R/W
7-bits
0
ACK Command Code ACK
1-bit
8-bits: xxxxxx00
Register
ACK
8-bits
1-bit
1-bit
P
Figure 4a: Prior to Progread Command Set Register Address
The user can ignore the STOP condition above and use a repeated START condition instead, straight after the slave acknowledgement bit (i.e., followed by
the Progread command):
Sr Address
7-bits
R/W
ACK
ID Byte
1
1-bit
8 bits
ACK Data_1 ACK Data_2 ACK Data_last NACK P
1-bit
8-bits
1-bit
8-bits
1-bit
8-bits
1-bit
Figure 4b: Progread Command Frame
Note: Figure 4b above by itself is the Progread command format. The ID byte for the 5V9888 is 10hex. Each byte recieved increments the register address.
23
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
PROGSAVE
JTAG INSTRUCTION REGISTER
DESCRIPTION
To save configuration into EEPROM, WRITE ENABLE pin must be set LOW
S
Address
R/W
7-bits
0
ACK Command Code ACK
1-bit
8-bits:xxxxxx01
P
IR (3)
0
0
0
0
0
0
0
0
1
1
1
1-bit
NOTE:
PROGWRITE is for writing to the 5V9888 registers.
PROGREAD is for reading the 5V9888 registers.
PROGSAVE is for saving all the contents of the 5V9888 registers to the EEPROM.
PROGRESTORE is for loading the entire EEPROM contents to the 5V9888 registers.
PROGRESTORE
S
Address
R/W
7-bits
0
ACK Command Code ACK
1-bit
8-bits:xxxxxx10
P
1-bit
JTAG INTERFACE
In addition to the IEEE 1149.1 instructions EXTEST, SAMPLE/PRELOAD,
CLAMP, HIGH-Z and BYPASS, the 5V9888 allows access to internal
programming registers using the REGADDR (set register address), REGDATAR
(read register) and REGDATW (write register instructions. Data is always
accessed by byte, and the register address increments after each read or write.
The full instruction set follows. The IDT5V9888 will be updating the registers
during programming.
The JTAG TAP controller can be reset in one of four ways:
1) Power up in JTAG mode
2) Power up in I2C mode and then go into JTAG mode, or go out of and back
into JTAG mode with the I2C/JTAG pin
3) Apply TRST while in JTAG mode
4) Apply five rising edges of TCK with TMS high while in JTAG mode
IR (2)
0
0
0
0
1
1
1
1
0
0
1
IR (1)
0
0
1
1
0
0
1
1
0
0
1
IR (0)
0
1
0
1
0
1
0
1
0
1
1
Instructions
EXTEST(1)
SAMPLE/PRELOAD(1)
IDCODE(1)
REGADDR(2)
REGDATAW / PROGWRITE(3)
REGDATAR / PROGREAD(4)
PROGSAVE (5)
PROGRESTORE(6)
CLAMP(1)
HIGHZ(1,7)
BYPASS (1)
NOTES:
1. IEEE 1149.1 definition
2. REGADDR is for setting a specific 5V9888 register address.
3. REGDATAW/PROGWRITE is for writing to the 5V9888 registers.
4. REGDATAR/PROGREAD is for reading the 5V9888 registers.
5. PROGSAVE is for saving all the contents of the 5V9888 registers to the EEPROM.
WRITE ENABLE pin must be asserted LOW.
6. PROGRESTORE is for loading the entire EEPROM contents to the 5V9888 registers.
7. The OEMs bits for OUT1-6 must be set for tri-state when using the HIGHZ instruction
EEPROM INTERFACE
The IDT5V9888 can also store its configuration in an internal EEPROM. The contents of the device's internal programming registers can be saved to the
EEPROM by issuing a save instruction (ProgSave) and asserting the WRITE ENABLE pin LOW. They can be loaded back to the internal programming registers
by issuing a restore instruction (ProgRestore).
To initiate a save or restore using I2C, only two bytes are transferred. The Device Address is issued with the read/write bit set to "0", followed by the appropriate
command code. The save or restore instruction executes after the STOP condition is issued by the Master, during which time the IDT5V9888 will not generate
Acknowledge bits. The 5V9888 will acknowledge the instructions after it has completed execution of them. During that time, the I2C bus should be interpreted
as busy by all other users of the bus.
Using JTAG, the ProgSave and ProgRestore instructions selects the BYPASS register path for shifting the data from TDI to TDO during the data register scanning.
During the execution of a ProgSave or ProgRestore instruction, the IDT5V9888 will not accept a new programming instruction (read, write, save, or restore).
All non-programming JTAG instructions will function properly, but the user should wait until the save or restore is complete before issuing a new programming
instruction. If a new programming instruction is issued before the save or restore completes, the new instruction is ignored, and the BYPASS register path remains
in effect for shifting data from TDI to TDO during data register scanning.
The time it takes for the save (TSAVE) and restore (TRESTORE) instructions to complete is:
TSAVE = 100ms max, TRESTORE = 10 ms max
WRITE ENABLE should stay low for at least 10ms after the completion of a save instruction.
24
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
In order for the save and restore instructions to function properly, the IDT5V9888 must not be in shutdown mode (SHUTDOWN pin asserted). In the event
of an interrupt of some sort such as a power down of the part in the middle of a save or restore operation, the contents to or from the EEPROM will be partially
loaded, and a CRC error will be generated. The CERR bit (0x81) will be asserted to indicate that an error has occurred. The LOSS_LOCK signal will also
be asserted.
On power-up of the IDT5V9888, an automatic restore is performed to load the EEPROM contents into the internal programming registers. The auto-restore
will not function properly if the device is in shutdown mode (SHUTDOWN pin asserted). The IDT5V9888 will be ready to accept a programming instruction once
it acknowledges its 7-bit I2C address.
tTCLK
t4
t2
t1
TCLK
t3
TDI/TMS
tDS
tDH
TDO
TDO
tDO
t6
TRST
t5
Standard JTAG Timing
NOTE:
t1 = tTCLKLOW
t2 = tTCLKHIGH
t3 = tTCLKFALL
t4 = tTCLKRISE
t5 = tRST (reset pulse width)
t6 = tRSR (reset recovery)
JTAG
AC ELECTRICAL CHARACTERISTICS
Symbol
tTCLK
tTCLKHIGH
tTCLKLOW
tTCLKRISE
tTCLKFALL
tRST
tRSR
Parameter
JTAG Clock Input Period
JTAG Clock HIGH
JTAG Clock Low
JTAG Clock Rise Time
JTAG Clock Fall Time
JTAG Reset
JTAG Reset Recovery
Min.
100
40
40
—
—
50
50
Max.
—
—
—
5(1)
5(1)
—
—
SYSTEM INTERFACE PARAMETERS
Symbol
tDO
tDOH
tDS
tDH
Units
ns
ns
ns
ns
ns
ns
ns
Parameter
Data Output(1)
Data Output Hold(1)
Data Input, tRISE = 3ns
Data Input, tFALL = 3ns
NOTE:
1. 50pF loading on external output signals.
NOTE:
1. Guaranteed by design.
25
Min.
—
0
10
10
Max.
20
—
—
—
Units
ns
ns
ns
ns
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
I2C BUS DC CHARACTERISTICS
Symbol
VIH
VIL
VHYS
I IN
VOL
Parameter
Input HIGH Level
Input LOW Level
Hysteresis of Inputs
Input Leakage Current
Output LOW Voltage
Conditions
Min
0.7 * VDD
Typ
Max
0.3 * VDD
0.05 * VDD
±1.0
0.4
IOL = 3 mA
Unit
V
V
V
μA
V
I2C BUS AC CHARACTERISTICS FOR STANDARD MODE
Symbol
FSCLK
Parameter
Min
Serial Clock Frequency (SCLK)
Typ
0
Max
Unit
100
KHz
Bus free time between STOP and START
4.7
μs
tSU:START
Setup Time, START
4.7
μs
tHD:START
Hold Time, START
4
μs
tSU:DATA
Setup Time, data input (SDAT)
250
ns
tHD:DATA
Hold Time, data input (SDAT)(1)
0
tBUF
μs
Output data valid from clock
Capacitive Load for Each Bus Line
3.45
400
μs
pF
tR
Rise Time, data and clock (SDAT, SCLK)
1000
ns
tF
Fall Time, data and clock (SDAT, SCLK)
tOVD
CB
300
ns
tHIGH
HIGH Time, clock (SCLK)
4
μs
tLOW
LOW Time, clock (SCLK)
4.7
μs
4
μs
tSU:STOP
Setup Time, STOP
NOTE:
1. A device must internally provide a hold time of at least 300ns for the SDAT signal (referred to the VIHMIN of the SCLK signal) to bridge the undefined region of the falling edge
of SCLK.
I2C BUS AC CHARACTERISTICS FOR FAST MODE
Symbol
FSCLK
Parameter
Min
Serial Clock Frequency (SCLK)
0
Typ
Max
Unit
400
KHz
Bus free time between STOP and START
1.3
μs
tSU:START
Setup Time, START
0.6
μs
tHD:START
Hold Time, START
0.6
μs
tSU:DATA
Setup Time, data input (SDAT)
100
ns
tHD:DATA
Hold Time, data input (SDAT)(1)
0
tBUF
tOVD
CB
Output data valid from clock
Capacitive Load for Each Bus Line
μs
0.9
400
μs
pF
ns
tR
Rise Time, data and clock (SDAT, SCLK)
20 + 0.1 * CB
300
tF
Fall Time, data and clock (SDAT, SCLK)
20 + 0.1 * CB
300
ns
tHIGH
HIGH Time, clock (SCLK)
0.6
μs
tLOW
LOW Time, clock (SCLK)
1.3
μs
Setup Time, STOP
0.6
μs
tSU:STOP
NOTE:
1. A device must internally provide a hold time of at least 300ns for the SDAT signal (referred to the VIHMIN of the SCLK signal) to bridge the undefined region of the falling edge
of SCLK.
26
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
ABSOLUTE MAXIMUM RATINGS(1)
Symbol
Description
Max
Unit
VDD
Internal Power Supply Voltage
-0.5 to +4.6
V
VI
Input Voltage
-0.5 to +4.6
V
(2)
VO
Output Voltage
-0.5 to VDD + 0.5
V
TJ
Junction Temperature
150
°C
TSTG
Storage Temperature
–65 to +150
°C
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
2. Not to exceed 4.6V.
CAPACITANCE (TA = +25°C, f = 1MHz, VIN = 0V)(1)
Symbol
CIN
Parameter
Min.
Typ.
Max.
Unit
Input Capacitance
—
4
—
pF
Crystal Specifications
XTAL_FREQ
Crystal Frequency
8
—
50
MHz
XTAL_MIN
Minimum Crystal Load Capacitance
—
3.5
—
pF
XTAL_MAX
Maximum Crystal Load Capacitance
—
35.4
—
pF
Crystal Load Capacitance Resolution
—
0.125
—
Voltage Swing (peak-to-peak, nominal)
—
2.3
—
XTAL_VPP
V
NOTE:
1. Capacitance levels characterized but not tested.
RECOMMENDED OPERATING CONDITIONS
Symbol
VDD
TA
CLOAD_OUT
FIN
tPU
Description
Power Supply Voltage for LVTTL
Power Supply Voltage for LVDS/LVPECL
Operating Temperature, Ambient
Maximum Load Capacitance (LVTTL only)
External Reference Crystal
External Reference Clock, Industrial
Power-up time for all VDDs to reach minimum specified voltage
(power ramps must be monotonic)
Min.
3
3.135
–40
—
8
1
0.05
27
Typ.
3.3
3.3
—
—
—
—
—
Max.
3.6
3.465
+85
15
50
400
5
Unit
V
°C
pF
MHz
ms
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Symbol
VIHH
VIMM
VILL
Parameter
Input HIGH Voltage Level(1)
Input MID Voltage Level(1)
Input LOW Voltage Level(1)
I3
3-Level Input DC Current
IDD
Total Power Supply Current
(3.3V Supply, VDD)
Total Power Supply Current in
Shutdown Mode(2)
IDDS
Test Conditions
I2C/JTAG 3-Level Input
I2C/JTAG 3-Level Input
I2C/JTAG 3-Level Input
HIGH Level
VIN = VDD
VIN = VDD/2
MID Level
VIN = GND
LOW Level
2 outputs @166MHz; 4 outputs @ 83MHz
2 outputs @20MHz; 4 outputs @ 40MHz
Global Shutdown Mode
(PLLs, dividers, outputs, etc. powered down)
Min.
VDD – 0.4
VDD/2 – 0.2
—
—
–50
–200
—
—
—
Typ.
—
—
—
—
—
—
120
40
2
Max.
—
VDD/2 + 0.2
0.4
200
+50
—
—
—
—
Unit
V
V
V
μA
mA
mA
NOTES:
1. These inputs are normally wired to VDD, GND, or left floating. If these inputs are switched dynamically after powerup, the function and timing of the outputs may be glitched, and
the PLL may require additional tAQ time before all datasheet limits are achieved.
2. Dividers must reload reprogrammed values via power-on reset or terminal count reload in order to ensure low-power mode.
DC ELECTRICAL CHARACTERISTICS FOR 3.3V LVTTL(1)
Symbol
IOH
IOL
VIH
VIL
IIH
IIL
IOZD
Parameter
Output HIGH Current
Output LOW Current
Input Voltage HIGH
Input Voltage LOW
Input HIGH Current
Input LOW Current
Output Leakage Current
Test Conditions
VOH = VDD - 0.5, VDD = 3.3V ± 0.3V
VOL = 0.5V, VDD = 3.3V ± 0.3V
Typ.
24
24
—
—
—
—
—
Max.
—
—
—
0.8
10
10
10
Unit
mA
mA
V
V
μA
μA
μA
Test Conditions
REF = LOW
Outputs enabled, All outputs unloaded
VDD = Max., CL = 0pF
Typ.
6
Max
12
Unit
mA
40
60
μA/MHz
FREFERENCE CLOCK = 33MHz, CL = 15pf
26
40
FREFERENCE CLOCK = 133MHz, CL = 15pf
FREFERENCE CLOCK = 200MHz, CL = 15pf
80
112
120
170
VIN = VDD
VIN = 0V
3-state outputs
Min.
12
12
2
—
—
—
—
NOTE:
1. See RECOMMENDED OPERATING RANGE table.
POWER SUPPLY CHARACTERISTICS FOR LVTTL OUTPUTS
Symbol
IDDQ
IDDD
ITOT
Parameter
Quiescent VDD Power Supply Current
Dynamic VDD Power Supply
Current per Output
Total Power VDD Supply Current
28
mA
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS FOR LVDS
Symbol
VOT (+)
VOT (-)
Δ VOT
VOS
Δ VOS
IOS
IOSD
Parameter
Differential Output Voltage for the TRUE binary state
Differential Output Voltage for the FALSE binary state
Change in VOT between Complimentary Output States
Output Common Mode Voltage (Offset Voltage)
Change in VOS between Complimentary Output States
Outputs Short Circuit Current, VOUT+ or VOUT- = 0V or VDD
Differential Outputs Short Circuit Current, VOUT+ = VOUT-
Min.
247
-247
—
1.125
—
—
—
Typ.
—
—
—
1.2
—
9
6
Max
454
-454
50
1.375
50
24
12
Unit
mV
mV
mV
V
mV
mA
mA
Typ.
68
Max
90
Unit
mA
30
45
μA/MHz
POWER SUPPLY CHARACTERISTICS FOR LVDS OUTPUTS(1)
Symbol
IDDQ
Parameter
Quiescent VDD Power Supply Current
IDDD
Dynamic VDD Power Supply
Current per Output
ITOT
Total Power VDD Supply Current
Test Conditions(2)
REF = LOW
Outputs enabled, All outputs unloaded
VDD = Max., CL = 0pF
FREFERENCE CLOCK = 100MHz, CL = 5pf
86
130
FREFERENCE CLOCK = 200MHz, CL = 5pf
FREFERENCE CLOCK = 400MHz, CL = 5pf
100
122
150
190
mA
Typ.
—
—
—
Max
VDD - 0.9
VDD - 1.61
0.93
Unit
V
V
V
NOTES:
1. Output banks 4 and 5 are toggling. Other output banks are powered down.
2. The termination resistors are excluded from these measurements.
DC ELECTRICAL CHARACTERISTICS FOR LVPECL
Symbol
VOH
VOL
VSWING
Parameter
Output Voltage HIGH, terminated through 50Ω tied to VDD - 2V
Output Voltage LOW, terminated through 50Ω tied to VDD - 2V
Peak to Peak Output Voltage Swing
Min.
VDD - 1.2
VDD - 1.95
0.55
POWER SUPPLY CHARACTERISTICS FOR LVPECL OUTPUTS(1)
Symbol
IDDQ
IDDD
ITOT
Parameter
Quiescent VDD Power Supply Current
Dynamic VDD Power Supply
Current per Output
Total Power VDD Supply Current
Test Conditions(2)
REF = LOW
Outputs enabled, All outputs unloaded
VDD = Max., CL = 0pF
Typ.
86
Max
110
Unit
mA
35
50
μA/MHz
FREFERENCE CLOCK = 100MHz, CL = 5pf
120
180
FREFERENCE CLOCK = 200MHz, CL = 5pf
FREFERENCE CLOCK = 400MHz, CL = 5pf
130
140
190
210
NOTES:
1. Output banks 4 and 5 are toggling. Other output banks are powered down.
2. The termination resistors are excluded from these measurements.
29
mA
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
AC TIMING ELECTRICAL CHARACTERISTICS
(SPREAD SPECTRUM GENERATION = OFF)
Symbol
fIN
1/t1
Parameter
Input Frequency
Output Frequency
fVCO
fPFD
fBW
t2
VCO Frequency
PFD Frequency
Loop Bandwidth
Input Duty Cycle
t3
Output Duty Cycle
t6
Slew Rate
SLEWx(bits) = 00
Slew Rate
SLEWx(bits) = 01
Slew Rate
SLEWx(bits) = 10
Slew Rate
SLEWx(bits) = 11
Rise Times
Fall Times
Rise Times
Fall Times
Output three-state Timing
t7
Clock Jitter(3,7)
t8
Output Skew
t9
t10
t11
Lock Time
Lock time(8)
Write-Protect Time
t4(2)
t5
Test Conditions
Input Frequency Limit
Single Ended Clock output limit (LVTTL)
Differential Clock output limit (LVPECL/ LVDS)
VCO operating Frequency Range
PFD operating Frequency Range
Based on loop filter resistor and capacitor values
Duty Cycle for Input
Measured at VDD/2, FOUT ≤ 200MHz
Measured at VDD/2, FOUT > 200MHz
Single-Ended Output clock rise and fall time,
20% to 80% of VDD (Output Load = 15pf)
Single-Ended Output clock rise and fall time,
20% to 80% of VDD (Output Load = 15pf)
Single-Ended Output clock rise and fall time,
20% to 80% of VDD (Output Load = 15pf)
Single-Ended Output clock rise and fall time,
20% to 80% of VDD (Output Load = 15pf)
LVDS, 20% to 80%
Min.
1(1)
0.0049
0.0049
10
0.4(1)
0.03
40
Typ.
—
—
—
—
—
—
—
Max
400
200
500
1200
400
40
60
Unit
MHz
MHz
45
40
—
—
—
2.75
55
60
—
%
—
2
—
—
1.25
—
—
0.75
—
—
—
—
—
—
850
850
500
500
—
ns
—
—
—
—
200
—
—
—
—
—
150 +
1/FOUTX
150
—
150
—
—
10
10
20
—
20
100
—
ms
μs
ms
MHz
MHz
MHz
%
V/ns
LVPECL, 20% to 80%
Time for output to enter or leave three-state mode
after SHUTDOWN/OE switches
Peak-to-peak period jitter,
fPFD > 20MHz
CLK outputs measured at VDD/2
fPFD < 20MHz
Skew between output to output on the same bank
(bank 4 and bank 5 only)(4, 5)
PLL Lock Time from Power-up(6)
PLL Lock time from shutdown mode
Hold Time after TSAVE for WRITE ENABLE signal
ps
ps
ps
NOTES:
1. Practical lower input frequency is determined by loop filter settings.
2. A slew rate of 2V/ns or greater should be selected for output frequencies of 100MHz and higher.
3. Input frequency is the same as the output with all output banks running at the same frequency.
4. Skew measured between all in-phase outputs in the same bank.
5. Skew measured between the cross points of all differential output pairs under identical input and output interfaces, transitions and load conditions on any one device.
6. Includes loading the configuration bits from EEPROM to PLL registers. It does not include EEPROM programming/write time.
7. Guaranteed by design but not production tested.
8. Actual PLL lock time depends on the loop configuration.
SPREAD SPECTRUM GENERATION SPECIFICATIONS
Symbol
fIN
fMOD
fSPREAD
Parameter
Input Frequency
Mod Freq
Spread Value
Description
Input Frequency Limit
Modulation Frequency
Amount of Spread Value (Programmable) - Down Spread
Amount of Spread Value (Programmable) - Center Spread
NOTE:
1. Practical lower input frequency is determined by loop filter settings.
30
Min.
1(1)
—
Typ.
Max
—
400
33
—
-0.5, -1, -2.5, -3.5, -4
-0.5 to +0.5
Unit
MHz
kHz
%fOUT
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND CONDITIONS(1)
VDD
0.1μF
CLKOUT
OUTPUTS
CLOAD
GND
NOTE:
1. All VDD pins must be tied together.
Test Circuits for DC Outputs
OTHER TERMINATION SCHEME (BLOCK DIAGRAM)
CLOAD
CLKOUT
OUTPUTS
CLKOUT
OUTPUTS
CLOAD
RLOAD
CLKOUT
CLOAD
GND
GND
LVDS: - 100Ω between differential outputs with 5pF
LVTTL: -15pF for each output
VDD-2V
RLOAD
CLOAD
CLKOUT
OUTPUTS
CLKOUT
CLOAD
GND
RLOAD
VDD-2V
LVPECL: - 50Ω to VDD-2V for each output with 5pF
31
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
RAM (PROGRAMMING REGISTER) TABLES
BIT #
(Default Settings)
ADDR
7
6
5
4
3
2
BIT #
1
0
Default
Register
Hex Value
7
6
5
4
3
2
1
0
DESCRIPTION
0x00
0x01
NoRead-Only
registers exist
0x02
0x03
0x04
0
0
0
0
0
0
0
0
00
MFC
0x05
1
1
1
1
1
1
1
1
FF
0x06
0
0
1
1
0
0
0
0
30
0x07
0
0
0
0
0
0
0
0
00
0x08
0
0
0
0
0
0
0
0
00
ODIV0_CONFIG0
IP0[2:0]_CONFIG0
RZ0[3:0]_CONFIG0
GINEN4
GINEN3
GINEN2
GINEN1
GINEN0
MFC=Manual Frequency Control Mode ('0'=All PLL Control (Default), "1"=PLL0 Control Only );
GINEN0 to GINEN5=GINx Pins Enable Bits, ("1"=Enable (Default), "0"=No Connect (Internal State will be "Low"));
Address 0x04, Bits[7:1] are reserved and should bet set to "0".
Address 0x05, Bits 7, 6, and 3 are reserved and should be set to "1'.
XDRV=crystal drive strength ("00" = 1.4V, "01" = 2.3V, "10"= 3.2V pk-pk swing typical, "11"=XTAL_IN with external clock-default); When
"11", XTALCAP[7:0] value must also be set to "0".
Bits 7,6, 3, 2, 1, 0 are reserved and should be set to "0"
XDRV[1:0]
XTAL load cap = 3.5pF+ (0.125 x XTALCAP[7:0]) , 3.5pF to 35.4pF; Each XTAL pin to GND;
(For example, "00000001"=0.125pF, "00000010"=0.25pF, "00000100"=0.5pF); Default = "00000000";
XTALCAP[7:0]
0x09
0
0
0
0
0
0
0
0
00
ODIV0_CONFIG1
IP0[2:0]_CONFIG1
RZ0[3:0]_CONFIG1
0x0A
0
0
0
0
0
0
0
0
00
ODIV0_CONFIG2
IP0[2:0]_CONFIG2
RZ0[3:0]_CONFIG2
0x0B
0
0
0
0
0
0
0
0
00
ODIV0_CONFIG3
IP0[2:0]_CONFIG3
RZ0[3:0]_CONFIG3
0x0C
0
0
0
0
0
0
0
0
00
CP0[3:0]_CONFIG0
CZ0[3:0]_CONFIG0
0x0D
0
0
0
0
0
0
0
0
00
CP0[3:0]_CONFIG1
CZ0[3:0]_CONFIG1
0x0E
0
0
0
0
0
0
0
0
00
CP0[3:0]_CONFIG2
CZ0[3:0]_CONFIG2
0x0F
0
0
0
0
0
0
0
0
00
CP0[3:0]_CONFIG3
0x10
0
0
0
0
0
0
0
0
00
0x11
0
0
0
0
0
0
0
0
00
D0[7:0]_CONFIG1
PLL0 INPUT DIVIDER D0 SETTING
0x12
0
0
0
0
0
0
0
0
00
D0[7:0]_CONFIG2
PLL0 D-Divider Values (Prescaler) - For 4 Configurations (Default value is '0');
0x13
0
0
0
0
0
0
0
0
00
D0[7:0]_CONFIG3
0x14
0
0
0
0
0
0
0
0
00
N0[7:0]_CONFIG0
0x15
0
0
0
0
0
0
0
0
00
N0[7:0]_CONFIG1
0x16
0
0
0
0
0
0
0
0
00
N0[7:0]_CONFIG2
0x17
0
0
0
0
0
0
0
0
00
N0[7:0]_CONFIG3
0x18
0
0
0
0
0
0
0
0
00
A0[3:0]_CONFIG0
N0[11:8]_CONFIG0
0x19
0
0
0
0
0
0
0
0
00
A0[3:0]_CONFIG1
N0[11:8]_CONFIG1
PLL0 LOOP FILTER SETTING
Loop Filter Values for PLL0 - For 4 Configurations (Default value is '0');
CONFIG0 will be selected if GINx are disabled and operating in MFC mode
ODIV0_CONFIGx=Determines which one of the 2 "Qx-Divider" Configurations to use with, for any of the "Qx-Divider" block associated
with PLL0; Used in MFC mode; Default ODIV value is "0", and use CONFIG0 of Qx-Divider;
Resistor = 0.3KΩ + RZ0[3:0] * 1KΩ, 0.3 to 15.3kOhm with 1kOhm Step, ("0000"=0.3kOhm, "0001"=1.3kOhm, "0010"=2.3kOhm, ...);
Zero capacitor = 6pF + CZ0[3:0] * 27.2pF, 6pF to 414pF with 27.2pF Step, ("0000"=6pF, "0001"=33.2pF, "0010"=60.4pF", ...);
Pole capacitor = 1.3pF + CP0[3:0] * 0.75pF, 1.3pF to 12.55pF with 0.75pF Step, ("0000"=1.3pF, "0001"=2.05pF, "0010"=2.8pF, ...)
Charge pump current = 5 * 2^IP0[2:0] μA, 5uA to 640uA with 5, 10, 20, 40, ... binary step;
CZ0[3:0]_CONFIG3
D0[7:0]_CONFIG0
PLL0 MULTIPLIER SETTING
CONFIG0 will be selected if GINx are disabled and operating in MFC mode.
0x1A
0
0
0
0
0
0
0
0
00
A0[3:0]_CONFIG2
N0[11:8]_CONFIG2
0x1B
0
0
0
0
0
0
0
0
00
A0[3:0]_CONFIG3
N0[11:8]_CONFIG3
0x1C
0
0
0
0
0
0
0
0
00
SP
SH
OE6
OE5
OE4
OE3
OE2
N0[11:0]_CONFIGx - Part of PLL0 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0');
A0[3:0]_CONFIGx - Part of PLL0 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0');
SSC_OFFSET0[5:0] - Spread Spectrum Fractional Multiplier Offset Value. See Spread Spectrum Settings in register address range
0x60-0x67
Total Multiplier Value M0 = 2 * N0[11:0] + A0 + 1 + SS_OFFSET0 * 1/64
When A0[3:0] = 0 and spread spectrum disabled, M0= 2 * N0[11:0];
When A0[3:0] > 0 and spread spectrum disabled, M0 = 2 * N0[11:0] + A0 + 1;
(Note: A < N-1, i.e. valid M values are 2, 4, 6, 8, 9, 10, 11, 12, 13, ..., 4095 assuming within fPFD and fVCO spec);
OE1
SP=Shutdown/OE Polarity for SHUTDOWN/OE signal pin, ("0"= Active High (Default), "1"= Active Low);
OEx=Output Disable Function for OUTx, ("1"=OUTx disabled based on OE pin (Default for OUT2-6, Disable mode is defined by OEMx
bits), "0"= Outputs enabled and no association with OE pin (Default));
0x1D
0
1
0
0
0
0
0
0
40
SH=Determines the function of the SHUTDOWN/OE signal pin. ("1"=Global Shutdown; this over-rides OEx and OSx bits, "0"=Ouput
Enable/Disable (Default))
OKC
OKC=clock OK count, "0"=8 cycles, "1"=1024 cycles (Default) of Input Clocks for Revertive Switchover Mode:
Address 0x1D, Bit 7 [5:0], and Address 0x1E are reserved and should be set to "0"
0x1E
0
0
0
0
0
0
0
0
00
32
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
RAM (PROGRAMMING REGISTER) TABLES
BIT #
(Default Settings)
BIT #
ADDR
7
6
5
4
3
2
1
0
Default
Register
Hex Value
0x1F
0
0
0
0
0
0
0
0
00
0x20
0
0
0
0
0
0
0
0
00
ODIV1_CONFIG0
IP1[2:0]_CONFIG0
RZ1[3:0]_CONFIG0
0x21
0
0
0
0
0
0
0
0
00
ODIV1_CONFIG1
IP1[2:0]_CONFIG1
RZ1[3:0]_CONFIG1
0x22
0
0
0
0
0
0
0
0
00
ODIV1_CONFIG2
IP1[2:0]_CONFIG2
RZ1[3:0]_CONFIG2
0x23
0
0
0
0
0
0
0
0
00
ODIV1_CONFIG3
IP1[2:0]_CONFIG3
RZ1[3:0]_CONFIG3
0x24
0
0
0
0
0
0
0
0
00
CP1[3:0]_CONFIG0
CZ1[3:0]_CONFIG0
0x25
0
0
0
0
0
0
0
0
00
CP1[3:0]_CONFIG1
CZ1[3:0]_CONFIG1
0x26
0
0
0
0
0
0
0
0
00
CP1[3:0]_CONFIG2
CZ1[3:0]_CONFIG2
0x27
0
0
0
0
0
0
0
0
00
CP1[3:0]_CONFIG3
0x28
0
0
0
0
0
0
0
0
00
D1[7:0]_CONFIG0
7
6
5
OEM1[1;0]
4
SLEW1[1:0]
3
2
1
0
DESCRIPTION
Configuring Output OUT1
INV1=Output Inversion for OUT1 ("0"= Non-Invert (Default), "1"=Invert);
SLEW1=Slew Rate Settings for OUT1 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns);
OEM1= Output Enable Mode for OUT1 output, when used with OE1 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park
Low, "11"=Park High);
Address 0x1F, Bits 3, 1, 0 are reserved and should be set to "0"
INV1
PLL1 LOOP FILTER SETTING
Loop Filter Values for PLL1 - For 4 Configurations (Default value is '0');
CONFIG0 will be selected if GINx are disabled and operating in MFC mode.
ODIV1_CONFIGx=Determines which one of the 2 "Qx-Divider" Configurations to use with, for any of the "Qx-Divider" block associated
with PLL1; Used in MFC mode; Default ODIV value is "0", and use CONFIG0 of Qx-Divider;
Resistor = 0.3KΩ + RZ1[3:0] * 1KΩ, 0.3 to 15.3kOhm with 1kOhm Step, ("0000"=0.3kOhm, "0001"=1.3kOhm, "0010"=2.3kOhm, ...);
Zero capacitor = 6pF + CZ1[3:0] * 27.2pF, 6pF to 414pF with 27.2pF Step, ("0000"=6pF, "0001"=33.2pF, "0010"=60.4pF", ...);
Pole capacitor = 1.3pF + CP1[3:0] * 0.75pF, 1.3pF to 12.55pF with 0.75pF Step, ("0000"=1.3pF, "0001"=2.05pF, "0010"=2.8pF, ...)
Charge pump current = 5 * 2^IP1[2:0] μA, 5uA to 640uA with 5, 10, 20, 40, ... binary step;
CZ1[3:0]_CONFIG3
0x29
0
0
0
0
0
0
0
0
00
D1[7:0]_CONFIG1
PLL1 INPUT DIVIDER D1 SETTING
0x2A
0
0
0
0
0
0
0
0
00
D1[7:0]_CONFIG2
PLL1 D-Divider Values (Prescaler) - For 4 Configurations (Default value is '0');
0x2B
0
0
0
0
0
0
0
0
00
D1[7:0]_CONFIG3
0x2C
0
0
0
0
0
0
0
0
00
N1[7:0]_CONFIG0
0x2D
0
0
0
0
0
0
0
0
00
N1[7:0]_CONFIG1
0x2E
0
0
0
0
0
0
0
0
00
N1[7:0]_CONFIG2
0x2F
0
0
0
0
0
0
0
0
00
N1[7:0]_CONFIG3
0x30
0
0
0
0
0
0
0
0
00
A1[3:0]_CONFIG0
N1[11:8]_CONFIG0
0x31
0
0
0
0
0
0
0
0
00
A1[3:0]_CONFIG1
N1[11:8]_CONFIG1
0x32
0
0
0
0
0
0
0
0
00
A1[3:0]_CONFIG2
N1[11:8]_CONFIG2
0x33
0
0
0
0
0
0
0
0
00
A1[3:0]_CONFIG3
N1[11:8]_CONFIG3
0x34
0
1
0
0
0
1
1
0
46
SRC2[1:0]
SRC1[1:0]
0x35
0
1
0
1
0
1
0
1
55
SRC6[1:0]
SRC5[1:0]
PLL1 MULTIPLIER SETTING
CONFIG0 will be selected if GINx are disabled and operating in MFC mode.
SM[1:0]
SRC4[1:0]
N1[11:0]_CONFIGx - Part of PLL1 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0');
A1[3:0]_CONFIGx - Part of PLL1 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0');
SSC_OFFSET1[5:0] - Spread Spectrum Fractional Multiplier Offset Value. See Spread Spectrum Settings in register address range
0x68-0x6F
Total Multiplier Value M1 = 2 * N1[11:0] + A1 + 1 + SS_OFFSET1 * 1/64
When A1[3:0] = 0 and spread spectrum disabled, M1= 2 * N1[11:0];
When A1[3:0] > 0 and spread spectrum disabled, M1 = 2 * N1[11:0] + A1 + 1 ;
(Note: A < N-1, i.e. valid M values are 2, 4, 6, 8, 9, 10, 11, 12, 13, ..., 4095 assuming within fPFD and fVCO spec);
PRIMCLK
SRC3[1:0]
PRIMCLK=Priority Selection for Input Clock ("0"=XTALIN/REF_IN becomes Primary (Default), "1"=CLK_IN becomes Primary);
SM = Switchover Mode ("0x"=Manual, "10"= Auto-NonRevertive, "11"=Auto-Revertive (Default));
Bit 3 is reserved and should be set to "0".
SRCx[1:0]=Input Source Selection for Output Dividers "Qx" blocks ("00"=Selected Input CLK, "01"=PLL0, "10"=PLL1, "11"=PLL2);
Default on SRC1 is the selected input clock. Default on SRC2-6 is PLL0 which will be powered down.
0x36
No Registers Exist
0x37
0x38
0
0
0
0
0
0
0
0
00
ODIV2_CONFIG0
IP2[2:0]_CONFIG0
RZ2[3:0]_CONFIG0
0x39
0
0
0
0
0
0
0
0
00
ODIV2_CONFIG1
IP2[2:0]_CONFIG1
RZ2[3:0]_CONFIG1
0x3A
0
0
0
0
0
0
0
0
00
ODIV2_CONFIG2
IP2[2:0]_CONFIG2
RZ2[3:0]_CONFIG2
0x3B
0
0
0
0
0
0
0
0
00
ODIV2_CONFIG3
IP2[2:0]_CONFIG3
RZ2[3:0]_CONFIG3
0x3C
0
0
0
0
0
0
0
0
00
CP2[3:0]_CONFIG0
CZ2[3:0]_CONFIG0
0x3D
0
0
0
0
0
0
0
0
00
CP2[3:0]_CONFIG1
CZ2[3:0]_CONFIG1
0x3E
0
0
0
0
0
0
0
0
00
CP2[3:0]_CONFIG2
CZ2[3:0]_CONFIG2
0x3F
0
0
0
0
0
0
0
0
00
CP2[3:0]_CONFIG3
CZ2[3:0]_CONFIG3
PLL2 LOOP FILTER SETTING
33
Loop Filter Values for PLL2 - For 4 Configurations (Default value is '0');
CONFIG0 will be selected if GINx are disabled and operating in MFC mode.
ODIV2_CONFIGx=Determines which one of the 2 "Qx-Divider" Configurations to use with, for any of the "Qx-Divider" block associated with
PLL2; Used in MFC mode; Default ODIV value is "0", and use CONFIG0 of Qx-Divider;
Resistor = 0.3KΩ + RZ2[3:0] * 1KΩ, 0.3 to 15.3kOhm with 1kOhm Step, ("0000"=0.3kOhm, "0001"=1.3kOhm, "0010"=2.3kOhm, ...);
Zero capacitor = 6pF + CZ2[3:0] * 27.2pF, 6pF to 414pF with 27.2pF Step, ("0000"=6pF, "0001"=33.2pF, "0010"=60.4pF", ...);
Pole capacitor = 1.3pF + CP2[3:0] * 0.75pF, 1.3pF to 12.55pF with 0.75pF Step, ("0000"=1.3pF, "0001"=2.05pF, "0010"=2.8pF, ...)
Charge pump current = 5 * 2^IP2[2:0] μA, 5uA to 640uA with 5, 10, 20, 40, ... binary step;
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
RAM (PROGRAMMING REGISTER) TABLES
BIT #
(Default Settings)
BIT #
ADDR
7
6
5
4
3
2
1
0
Default
Register
Hex Value
0x40
0
0
0
0
0
0
0
0
00
D2[7:0]_CONFIG0
0x41
0
0
0
0
0
0
0
0
00
D2[7:0]_CONFIG1
7
6
5
4
3
2
1
0
DESCRIPTION
PLL2 INPUT DIVIDER D2 SETTING
PLL2 D-Divider Values (Prescaler) - For 4 Configurations (Default value is '0');
0x42
0
0
0
0
0
0
0
0
00
D2[7:0]_CONFIG2
0x43
0
0
0
0
0
0
0
0
00
D2[7:0]_CONFIG3
0x44
0
0
0
0
0
0
0
0
00
N2[7:0]_CONFIG0
0x45
0
0
0
0
0
0
0
0
00
N2[7:0]_CONFIG1
0x46
0
0
0
0
0
0
0
0
00
N2[7:0]_CONFIG2
0x47
0
0
0
0
0
0
0
0
00
N2[7:0]_CONFIG3
0x48
0
0
0
0
0
0
0
0
00
N2[11:8]_CONFIG0
0x49
0
0
0
0
0
0
0
0
00
N2[11:8]_CONFIG1
0x4A
0
0
0
0
0
0
0
0
00
N2[11:8]_CONFIG2
0x4B
0
0
0
0
0
0
0
0
00
N2[11:8]_CONFIG3
0x4C
0
0
0
0
0
0
0
0
00
PLL2 MULTIPLIER SETTING
CONFIG0 will be selected if GINx are disabled and operating in MFC mode.
N2[11:0]_CONFIGx - Part of PLL2 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0');
Total Multiplier Value M2 = N2;
Bits [7:4] in addresses 0x48, 0x49, 0x4A, and 0x4B are reserved and should be set to "0"
OEM2[1:0]
Q2[1:0]_CONFIG1
SLEW2[1:0]
PM2[1:0]_CONFIG1
INV2
Q2[1:0]_CONFIG0
0x4D
1
0
1
1
1
0
1
1
BB
0x4E
0
0
0
0
0
0
0
0
00
Q2[9:2]_CONFIG0
0x4F
0
0
0
0
0
0
0
0
00
Q2[9:2]_CONFIG1
0x50
0
0
0
0
0
0
0
0
00
OEM3[1:0]
SLEW3[1:0]
0x51
1
0
1
1
1
0
1
1
BB
Q3[1:0]_CONFIG1
PM3[1:0]_CONFIG1
0x52
0
0
0
0
0
0
0
0
00
Q3[9:2]_CONFIG0
0x53
0
0
0
0
0
0
0
0
00
Q3[9:2]_CONFIG1
0x54
0
0
0
0
1
1
0
0
0C
OEM4[1:0]
SLEW4[1:0]
0x55
1
0
1
1
1
0
1
1
BB
Q4[1:0]_CONFIG1
PM4[1:0]_CONFIG1
0x56
0
0
0
0
0
0
0
0
00
Q4[9:2]_CONFIG0
0x57
0
0
0
0
0
0
0
0
00
Q4[9:2]_CONFIG1
0x58
0
0
0
0
1
1
0
0
0C
OEM5[1:0]
SLEW5[1:0]
0x59
1
0
1
1
1
0
1
1
BB
Q5[1:0]_CONFIG1
PM5[1:0]_CONFIG1
0x5A
0
0
0
0
0
0
0
0
00
Q5[9:2]_CONFIG0
0x5B
0
0
0
0
0
0
0
0
00
Q5[9:2]_CONFIG1
0x5C
0
0
0
0
0
0
1
1
03
OEM6[1:0]
SLEW6[1:0]
0x5D
1
0
1
1
1
0
1
1
BB
Q6[1:0]_CONFIG1
PM6[1:0]_CONFIG1
0x5E
0
0
0
0
0
0
0
0
00
Q6[9:2]_CONFIG0
0x5F
0
0
0
0
0
0
0
0
00
Q6[9:2]_CONFIG1
PM2[1:0]_CONFIG0
Configuring Output OUT2
INV2=Output Inversion for OUT2 ("0"= Non-Invert (Default), "1"=Invert);
SLEW2=Slew Rate Settings for OUT2 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns);
OEM2= Output Enable Mode for OUT2output, when used with OE2 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park
Low, "11"=Park High);
Q2[x:x]=Output Divider "Q2" Values (Default value is '2') - Support 2 output configurations when used in MFC mode;
PM2[x:x]=Divide Mode, ("00"=Divider Disabled;"01"=Divide by '1';"10"=Divide by 2; "11"=Divide by (Q+2) (Default));
(Note: To enable OUT2, PM2 register bit values for both CONFIG0 and CONFIG1 configurations must be non-zero.)
Address 0x4C, Bits 3, 1, 0 are reserved and should be set to "0"
INV3
Q3[1:0]_CONFIG0
PM3[1:0]_CONFIG0
Configuring Output OUT3
INV3=Output Inversion for OUT3 ("0"= Non-Invert (Default), "1"=Invert);
SLEW3=Slew Rate Settings for OUT3 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns);
OEM3= Output Enable Mode for OUT3 output, when used with OE3 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park
Low, "11"=Park High);
Q3[x:x]=Output Divider "Q3" Values (Default value is '2') - Support 2 output configurations when used in MFC mode;
PM3[x:x]=Divide Mode, ("00"=Divider Disabled;"01"=Divide by '1';"10"=Divide by 2; "11"=Divide by (Q+2) (Default));
(Note: To enable OUT3, PM3 register bit values for both CONFIG0 and CONFIG1 configurations must be non-zero.)
Address 0x50, Bits 3, 1, 0 are reserved and should be set to "0"
INV4_1
Q4[1:0]_CONFIG0
INV5_1
LVL4[1:0]
INV4_0
PM4[1:0]_CONFIG0
Configuring Output OUT4
INV4_1=Output Inversion for /OUT4 ("0"= Invert , "1"=Non-Invert (Default));
INV4_0=Output Inversion for OUT4 ("0"= Invert , "1"=Non-Invert (Default));
SLEW4=Slew Rate Settings for OUT4 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns);
OEM4= Output Enable Mode for OUT4 output, when used with OE4 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park
Low, "11"=Park High);
LVL4=Output IO Standard Selection, ("00"=LVTTL (Default), "01"=LVDS, "10"=LVPECL, "11"=Reserved);
Q4[x:x]=Output Divider "Q4" Values (Default value is '2') - Support 2 output configurations when used in MFC mode;
PM4[x:x]=Divide Mode, ("00"=Divider Disabled;"01"=Divide by '1';"10"=Divide by 2; "11"=Divide by (Q+2) (Default));
(Note: To enable OUT4, PM4 register bit values for both CONFIG0 and CONFIG1 configurations must be non-zero.)
When using LVPECL or LVDS outputs, SLEW4 must be set to "00".
LVL5[1:0]
INV5_0
Q5[1:0]_CONFIG0
PM5[1:0]_CONFIG0
Configuring Output OUT5
INV5_1=Output Inversion for /OUT5 ("0"= Invert, "1"=Non-Invert (Default));
INV5_0=Output Inversion for OUT5 ("0"= Invert, "1"=Non-Invert (Default));
SLEW5=Slew Rate Settings for OUT5 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns);
OEM5= Output Enable Mode for OUT5 output, when used with OE5 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park
Low, "11"=Park High);
LVL5=Output IO Standard Selection, ("00"=LVTTL (Default), "01"=LVDS, "10"=LVPECL, "11"=Reserved);
Q5[x:x]=Output Divider "Q5" Values (Default value is '2') - Support 2 output configurations when used in MFC mode;
PM5[x:x]=Divide Mode, ("00"=Divider Disabled;"01"=Divide by '1';"10"=Divide by 2; "11"=Divide by (Q+2) (Default));
(Note: To enable OUT5, PM5 register bit values for both CONFIG0 and CONFIG1 configurations must be non-zero.)
When using LVPECL or LVDS outputs, SLEW5 must be set to "00".
INV6
Q6[1:0]_CONFIG0
PM6[1:0]_CONFIG0
Configuring Output OUT6
INV6=Output Inversion for OUT6 ("0"= Non-Invert (Default), "1"=Invert);
SLEW6=Slew Rate Settings for OUT6 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns);
OEM6= Output Enable Mode for OUT6 output, when used with OE6 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park
Low, "11"=Park High);
Q6[x:x]=Output Divider "Q6" Values (Default value is '2') - Support 2 output configurations when used in MFC mode;
PM6[x:x]=Divide Mode, ("00"=Divider Disabled;"01"=Divide by '1';"10"=Divide by 2; "11"=Divide by (Q+2) (Default));
(Note: To enable OUT6, PM6 register bit values for both CONFIG0 and CONFIG1 configurations must be non-zero.)
Address 0x5C, Bits 3 is reserved and should be set to "0"
Address 0x5C, Bits 1, 0 are reserved and should be set to "1"
34
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
RAM (PROGRAMMING REGISTER) TABLES
BIT #
(Default Settings)
BIT #
ADDR
7
6
5
4
3
2
1
0
Default
Register
Hex Value
0x60
0
0
0
0
0
0
0
0
00
0x61
0
0
0
0
0
0
0
0
00
0x62
0
0
0
0
0
0
0
0
00
SD0[3:0][1]
SD0[3:0][0]
0x63
0
0
0
0
0
0
0
0
00
SD0[3:0][3]
SD0[3:0][2]
0x64
0
0
0
0
0
0
0
0
00
SD0[3:0][5]
SD0[3:0][4]
0x65
0
0
0
0
0
0
0
0
00
SD0[3:0][7]
SD0[3:0][6]
0x66
0
0
0
0
0
0
0
0
00
SD0[3:0][9]
SD0[3:0][8]
0x67
0
0
0
0
0
0
0
0
00
SD0[3:0][11]
SD0[3:0][10]
0x68
0
0
0
0
0
0
0
0
00
TSSC1[3:0]
NSSC1[3:0]
0x69
0
0
0
0
0
0
0
0
00
0x6A
0
0
0
0
0
0
0
0
00
SD1[3:0][1]
SD1[3:0][0]
0x6B
0
0
0
0
0
0
0
0
00
SD1[3:0][3]
SD1[3:0][2]
0x6C
0
0
0
0
0
0
0
0
00
SD1[3:0][5]
SD1[3:0][4]
0x6D
0
0
0
0
0
0
0
0
00
SD1[3:0][7]
SD1[3:0][6]
0x6E
0
0
0
0
0
0
0
0
00
SD1[3:0][9]
SD1[3:0][8]
0x6F
0
0
0
0
0
0
0
0
00
SD1[3:0][11]
SD1[3:0][10]
7
6
5
4
TSSC0[3:0]
DITH0
3
2
1
0
DESCRIPTION
NSSC0[3:0]
SS_OFFSET0[5:0]
X2_0
SPREAD SPRECTRUM SETTINGS FOR PLL0
DITH1
SS_OFFSET0=SS Fractional Offset/ First Sample (Unsigned);
TSSC0=# of PFD Cycles Per SS Cycle Step, TSSC="0000" for SSC off (Default);
NSSC0=# of SS Samples to Use from SS Memory (Default is "0");
DITH0=LSB DITHER on Σ, ("1"=dither on, "0"=off (Default));
X2_0=ΣΔ output x2, ("1"=x2, "0"=normal (Default));
SD0=Delta-encoded samples (unsigned); Waveform start with SS_OFFSET0, then SS_OFFSET0+SD0[0], etc. (Default is "0");
SS_OFFSET1[5:0]
X2_1
SPREAD SPRECTRUM SETTINGS FOR PLL1
SS_OFFSET1=SS Fractional Offset/ First Sample (Unsigned);
TSSC1=# of PFD Cycles Per SS Cycle Step, TSSC="0000" for SSC off (Default);
NSSC1=# of SS Samples to Use from SS Memory (Default is "0");
DITH1=LSB DITHER on ΣΔ, ("1"=dither on, "0"=off (Default));
X2_1=ΣΔ output x2, ("1"=x2, "0"=off (Default));
SD1=Delta-encoded samples (unsigned); Waveform start with SS_OFFSET1, then SS_OFFSET1+SD1[0], etc. (Default is "0");
0x70
0x71
0x72
0x73
0x74
0x75
0x76
0x77
No Registers Exist
0x78
0x79
0x7A
0x7B
0x7C
0x7D
0x7E
0x7F
0x80
0x81
CRC error in EEPROM
CERR = CRC error bit indicator ("1`" = CRC error)
CERR
35
Read-Only
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
RECOMMENDED LANDING PATTERN
NL 28 pin
NOTE:
All dimensions are in millimeters.
36
IDT5V9888
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT
XXXXX
Device Type
XX
Package
X
Process
CORPORATE HEADQUARTERS
6024 Silver Creek Valley Road
San Jose, CA 95138
I
Industrial (-40°C to +85°C)
PFG
NLG
Thin Quad Flat Pack - Green
Thermally Enhanced Plastic Very Fine Pitch
Quad Flat No Lead Package - Green
5V9888
3.3V EEPROM Programmable Clock Generator
for SALES:
800-345-7015 or 408-284-8200
fax: 408-284-2775
www.idt.com
37
for Tech Support:
clockhelp@idt.com
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