8430B-71
700MHZ, Low Jitter, Crystal Interface
LVCMOS-to-3.3V LVPECL Frequency Synthesizer
GENERAL DESCRIPTION
FEATURES
The 8430B-71 is a general purpose, dual output Crystal/
LVCMOS-to-3.3V Differential LVPECL High Frequency Synthesizer and a member of the HiPerClockS™ family of High
Performance Clock Solutions from ICS. The 8430B-71 has a
selectable crystal oscillator interface or LVCMOS TEST_CLK.
The VCO operates at a frequency range of 250MHz to 700MHz.
With the output configured to divide the VCO frequency by
2, output frequency steps as small as 2MHz can be achieved
using a 16MHz crystal or test clock. Output frequencies up
to 700MHz can be programmed using the serial or parallel interfaces to the configuration logic. The low jitter and frequency range
of the 8430B-71 make it an ideal clock generator for most clock
tree applications.
• Dual differential 3.3V LVPECL outputs
Data Sheet
• Selectable crystal oscillator interface or LVCMOS TEST_CLK
• Output frequency up to 700MHz
• Crystal input frequency range: 12MHz to 27MHz
• VCO range: 250MHz to 700MHz
• Parallel or serial interface for programming counter and
output dividers
• RMS period jitter: 9ps (maximum)
• Cycle-to-cycle jitter: 25ps (maximum)
• 3.3V supply voltage
• 0°C to 70°C ambient operating temperature
• Replaces 8430-71
• Available in lead-free (RoHS 6) package
BLOCK DIAGRAM
PIN ASSIGNMENT
VCO_SEL PU
XTAL_IN
nP_LOAD
M0
M1
32 31 30 29 28 27 26 25
0
OSC
M2
XTAL_IN
M3
M4
TEST_CLK PD
VCO_SEL
XTAL_SEL PU
1
XTAL_OUT
÷16
PLL
M5
1
24
XTAL_OUT
M6
2
23
TEST_CLK
M7
3
22
XTAL_SEL
M8
4
21
VCCA
N0
5
20
S_LOAD
N1
6
19
S_DATA
N2
7
18
S_CLOCK
VEE
8
17
MR
ICS8430B-71
9 10 11 12 13 14 15 16
Phase Detector
TEST
VEE
Configuration Interface Logic
nFOUT0
S_DATA PD
S_CLOCK PD
FOUT0
S_LOAD PD
VCCO
FOUT0
nFOUT0
nFOUT1
1
÷2
FOUT0
nFOUT0
FOUT1
÷N
VCC
÷M
0
TEST
VCO
MR PD
32-Lead LQFP
7mm x 7mm x 1.4mm package body
Y Package
Top View
nP_LOAD PD
M0:M8
N0:N2
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8430B-71 Data Sheet
FUNCTIONAL DESCRIPTION
automatically occur during power-up. The TEST output is LOW when
operating in the parallel input mode. The relationship between the
VCO frequency, the crystal frequency and the M divider is defined
as follows:
fxtal x 2M
fVCO =
16
NOTE: The functional description that follows describes operation
using a 16MHz crystal. Valid PLL loop divider values for different
crystal or input frequencies are defined in the Input Frequency
Characteristics, Table 5, NOTE 1.
The 8430B-71 features a fully integrated PLL and therefore requires no external components for setting the loop bandwidth. A
parallel-resonant, fundamental crystal is used as the input to the
on-chip oscillator. The output of the oscillator is divided by 16 prior
to the phase detector. With a 16MHz crystal, this provides a 1MHz
reference frequency. The VCO of the PLL operates over a range of
250MHz to 700MHz. The output of the M divider is also applied to
the phase detector.
The M value and the required values of M0 through M8 are shown
in Table 3B, Programmable VCO Frequency Function Table. Valid M
values for which the PLL will achieve lock for a 16MHz reference are
defined as 125 ≤ M ≤ 350. The frequency out is defined as follows:
fout = fVCO = fxtal x 2M
N
16
N
Serial operation occurs when nP_LOAD is HIGH and S_LOAD is
LOW. The shift register is loaded by sampling the S_DATA bits with
the rising edge of S_CLOCK. The contents of the shift register are
loaded into the M divider and N output divider when S_LOAD transitions from LOW-to-HIGH. The M divide and N output divide values
are latched on the HIGH-to-LOW transition of S_LOAD. If S_LOAD
is held HIGH, data at the S_DATA input is passed directly to the M
divider and N output divider on each rising edge of S_CLOCK. The
serial mode can be used to program the M and N bits and test bits
T1 and T0. The internal registers T0 and T1 determine the state of
the TEST output as follows:
The phase detector and the M divider force the VCO output
frequency to be 2M times the reference frequency by adjusting
the VCO control voltage. Note that for some values of M (either
too high or too low), the PLL will not achieve lock. The output
of the VCO is scaled by a divider prior to being sent to each of the
LVPECL output buffers. The divider provides a 50% output duty cycle.
The programmable features of the 8430B-71 support two input modes to program the M divider and N output divider.
The two input operational modes are parallel and serial. Figure 1 shows the timing diagram for each mode. In parallel
mode, the nP_LOAD input is initially LOW. The data on inputs
M0 through M8 and N0 through N2 is passed directly to the M
divider and N output divider. On the LOW-to-HIGH transition of
the nP_LOAD input, the data is latched and the M divider remains
loaded until the next LOW transition on nP_LOAD or until a serial
event occurs. As a result, the M and N bits can be hardwired to set
the M divider and N output divider to a specific default state that will
T1
T0
TEST Output
0
0
LOW
0
1
S_Data clocked into register
1
0
Output of M divider
1
1
CMOS Fout
FIGURE 1. PARALLEL & SERIAL LOAD OPERATIONS
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8430B-71 Data Sheet
TABLE 1. PIN DESCRIPTIONS
Number
Name
1, 2, 3,
M5, M6, M7,
28, 29, 30 M0, M1, M2, M3,
31, 32
M4
4
M8
Type
Input
Input
Description
Pulldown M divider inputs. Data latched on LOW-to-HIGH transition of nP_
LOAD input. LVCMOS / LVTTL interface levels.
Pullup
5, 6
N0, N1
Input
7
N2
Input
Pulldown Determines output divider value as defined in Table 3C
Pullup Function Table. LVCMOS / LVTTL interface levels.
8, 16
VEE
Power
9
TEST
Output
10
VCC
Power
Negative supply pins.
Test output which is ACTIVE in the serial mode of operation.
Output driven LOW in parallel mode. LVCMOS/LVTTL interface levels.
Core power supply pin.
11, 12
FOUT1, nFOUT1
Output
Differential output for the synthesizer. 3.3V LVPECL interface levels.
13
VCCO
Power
Output supply pin.
14, 15
FOUT0, nFOUT0
Output
Differential output for the synthesizer. 3.3V LVPECL interface levels.
Active High Master reset. When logic HIGH, the internal dividers are
reset causing the true outputs (FOUTx) to go low and the inverted out17
MR
Input
Pulldown puts (nFOUTx) to go high. When Logic LOW, the internal dividers and
the outputs are enabled. Assertion of MR does not affect loaded
M, N, and T values. LVCMOS / LVTTL interface levels.
Clocks in serial data present at S_DATA input into the shift register
18
S_CLOCK
Input
Pulldown
on the rising edge of S_CLOCK. LVCMOS / LVTTL interface levels.
Shift register serial input. Data sampled on the rising edge of S_
19
S_DATA
Input
Pulldown
CLOCK. LVCMOS / LVTTL interface levels.
Controls transition of data from shift register into the dividers. LVCMOS
20
S_LOAD
Input
Pulldown
/ LVTTL interface levels.
21
VCCA
Power
Analog supply pin.
Selects between the crystal oscillator or test clock as the
22
XTAL_SEL
Input
Pullup PLL reference source. Selects XTAL inputs when HIGH.
Selects TEST_CLK when LOW. LVCMOS / LVTTL interface levels.
23
TEST_CLK
Input
Pulldown Test clock input. LVCMOS interface levels.
24,
XTAL_OUT,
Crystal oscillator interface. XTAL_IN is the input.
Input
25
XTAL_IN
XTAL_OUT is the output.
Parallel load input. Determines when data present at M8:M0 is loaded
26
nP_LOAD
Input
Pulldown into the M divider, and when data present at N2:N0 sets the
N output divider value. LVCMOS / LVTTL interface levels.
Determines whether synthesizer is in PLL or bypass mode.
27
VCO_SEL
Input
Pullup
LVCMOS / LVTTL interface levels.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
Parameter
CIN
Input Capacitance
Test Conditions
Minimum
Typical
Maximum
Units
4
pF
RPULLUP
Input Pullup Resistor
51
kΩ
RPULLDOWN
Input Pulldown Resistor
51
kΩ
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8430B-71 Data Sheet
TABLE 3A. PARALLEL AND SERIAL MODE FUNCTION TABLE
Inputs
Conditions
MR
nP_LOAD
M
N
S_LOAD
S_CLOCK
S_DATA
H
X
X
X
X
X
X
Reset. Forces outputs LOW.
L
L
Data
Data
X
X
X
Data on M and N inputs passed directly to the M divider
and N output divider. TEST output forced LOW.
L
↑
Data
Data
L
X
X
L
H
X
X
L
↑
Data
L
H
X
X
↑
L
Data
L
H
X
X
↓
L
Data
M divider and N output divider values are latched.
L
H
X
X
L
X
X
Parallel or serial input do not affect shift registers.
L
H
X
X
H
↑
Data
Data is latched into input registers and remains loaded
until next LOW transition or until a serial event occurs.
Serial input mode. Shift register is loaded with data on
S_DATA on each rising edge of S_CLOCK.
Contents of the shift register are passed to the
M divider and N output divider.
S_DATA passed directly to M divider as it is clocked.
NOTE: L = LOW
H = HIGH
X = Don’t care
↑ = Rising edge transition
↓ = Falling edge transition
TABLE 3B. PROGRAMMABLE VCO FREQUENCY FUNCTION TABLE (NOTE 1)
125
256
M8
0
128
M7
0
64
M6
1
32
M5
1
16
M4
1
8
M3
1
4
M2
1
2
M1
0
1
M0
1
252
126
0
0
1
1
1
1
1
1
0
254
127
0
0
1
1
1
1
1
1
1
256
128
0
1
0
0
0
0
0
0
0
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
696
348
1
0
1
0
1
1
1
0
0
698
349
1
0
1
0
1
1
1
0
1
VCO Frequency
(MHz)
M Divide
250
700
350
1
0
1
0
1
1
1
1
0
NOTE 1: These M divide values and the resulting frequencies correspond to crystal or TEST_CLK input frequency of 16MHz.
TABLE 3C. PROGRAMMABLE OUTPUT DIVIDER FUNCTION TABLE
Inputs
N Divider Value
FOUT0, nFOUT0 Output Frequency
(MHz)
Minimum
Maximum
125
350
N2
0
N1
0
N0
0
2
0
0
1
4
0
1
0
8
31.25
87.5
0
1
1
16
15.625
43.75
1
0
0
1
250
700
1
0
1
2
125
350
1
1
0
4
62.5
175
1
1
1
8
31.25
87.5
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8430B-71 Data Sheet
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC
4.6V
Inputs, VI
-0.5V to VCC + 0.5V
Outputs, IO
Continuous Current
Surge Current
50mA
100mA
Package Thermal Impedance, θJA
47.9°C/W (0 lfpm)
Storage Temperature, TSTG
-65°C to 150°C
N OT E : S t r e s s e s b eyo n d t h o s e l i s t e d u n d e r A b s o l u t e
Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifications only. Functional
operation of product at these conditions or any conditions beyond
those listed in the DC Characteristics or AC Characteristics is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.
TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VCC = VCCA = VCCO = 3.3V±5%, TA = 0°C TO 70°C
Minimum
Typical
Maximum
Units
VCC
Symbol
Core Supply Voltage
Parameter
Test Conditions
3.135
3.3
3.465
V
VCCA
Analog Supply Voltage
3.135
3.3
3.465
V
VCCO
Output Supply Voltage
3.135
3.3
3.465
V
IEE
Power Supply Current
140
mA
ICCA
Analog Supply Current
15
mA
TABLE 4B. LVCMOS/LVTTL DC CHARACTERISTICS, VCC = VCCA = VCCO = 3.3V±5%, TA = 0°C TO 70°C
Symbol
Parameter
Test Conditions
Minimum Typical
TEST_CLK; NOTE 1
VIH
Input
High Voltage
VIL
Input Low Voltage
IIH
IIL
Input
High Current
Input
Low Current
VCO_SEL, S_LOAD, S_DATA,
S_CLOCK, nP_LOAD, MR,
M0:M8, N0:N2, XTAL_SEL
Maximum Units
2.35
VCC + 0.3
V
2
VCC + 0.3
V
-0.3
0.8
V
M0-M7, N0, N1, MR, nP_LOAD,
S_CLOCK, S_DATA, S_LOAD
VCC = VIN = 3.465V
150
µA
M8, N2, XTAL_SEL, VCO_SEL
VCC = VIN = 3.465V
5
µA
TEST_CLK
VCC = VIN = 3.465V
200
µA
M0-M7, N0, N1, MR, nP_LOAD,
S_CLOCK, S_DATA, S_LOAD
VCC = 3.465V,
VIN = 0V
-5
µA
TEST_CLK, M8, N2, XTAL_SEL,
VCO_SEL
VCC = 3.465V,
VIN = 0V
-150
µA
2.6
V
Output
TEST; NOTE 2
High Voltage
Output
VOL
TEST; NOTE 2
Low Voltage
NOTE 1: Characterized with 1ns input edge rate.
NOTE 2: Outputs terminated with 50Ω to VCCO/2.
VOH
0.5
V
TABLE 4C. LVPECL DC CHARACTERISTICS, VCC = VCCA = VCCO = 3.3V±5%, TA = 0°C TO 70°C
Symbol
Parameter
Test Conditions
Minimum
Typical
Maximum
Units
VOH
Output High Voltage; NOTE 1
VCC - 1.4
VCC - 0.9
V
VOL
Output Low Voltage; NOTE 1
VCC - 2.0
VCC - 1.7
V
VSWING
Peak-to-Peak Output Voltage Swing
0.6
1.0
V
NOTE 1: Outputs terminated with 50W to VCCO - 2V. See “Parameter Measurement Information” section,
“3.3V Output Load Test Circuit” figure.
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8430B-71 Data Sheet
TABLE 5. INPUT CHARACTERISTICS, VCC = VCCA = VCCO = 3.3V±5%, TA = 0°C TO 70°C
Symbol
fIN
tr_input
Parameter
Test Conditions
Input Frequency
Input Rise Time
Minimum
TEST_CLK; NOTE 1
XTAL_IN, XTAL_OUT;
NOTE 1
S_CLOCK
Maximum
Units
12
Typical
27
MHz
12
27
MHz
50
MHz
5
ns
TEST_CLK
NOTE 1: For the input crystal and reference frequency range, the M value must be set for the VCO to operate within the
250MHz to 700MHz range. Using the minimum input frequency of 12MHz, valid values of M are 167 ≤ M ≤ 466.
Using the maximum frequency of 27MHz, valid values of M are 75 ≤ M ≤ 207.
TABLE 6. CRYSTAL CHARACTERISTICS
Parameter
Test Conditions
Minimum
Mode of Oscillation
Typical Maximum
Units
Fundamental
Frequency
27
MHz
Equivalent Series Resistance (ESR)
12
50
Ω
Shunt Capacitance
7
pF
Drive Level
1
mW
TABLE 7. AC CHARACTERISTICS, VCC = VCCA = VCCO = 3.3V±5%, TA = 0°C TO 70°C
Symbol
Parameter
FMAX
Output Frequency
Test Conditions
tjit(cc)
Cycle-to-Cycle Jitter; NOTE 1, 3
tjit(per)
Period Jitter, RMS; NOTE 1
tsk(o)
Output Skew; NOTE 2, 3
tR / tF
Output Rise/Fall Time
tS
tH
odc
tLOCK
Setup Time
Hold Time
Maximum
Units
700
MHz
fOUT > 87.5MHz
25
ps
fOUT ≤ 87.5MHz
45
ps
9
ps
15
ps
700
ps
20% to 80%
Minimum
Typical
200
M, N to nP_LOAD
5
ns
S_DATA to S_CLOCK
5
ns
S_CLOCK to S_LOAD
5
ns
M, N to nP_LOAD
5
ns
S_DATA to S_CLOCK
5
ns
S_CLOCK to S_LOAD
5
ns
Output Duty Cycle
N ≠ div-by-1
48
52
%
N = div-by-1, fOUT ≤ 400MHz
45
55
%
N = div-by-1,
400MHz < fOUT 630MHz
40
60
%
1
ms
PLL Lock Time
See Parameter Measurement Information section.
NOTE 1: Jitter performance using XTAL inputs.
NOTE 2: Defined as skew between outputs at the same supply voltage and with equal load conditions.
Measured at the output differential cross points.
NOTE 3: This parameter is defined in accordance with JEDEC Standard 65.
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8430B-71 Data Sheet
PARAMETER MEASUREMENT INFORMATION
3.3V OUTPUT LOAD AC TEST CIRCUIT
OUTPUT SKEW
PERIOD JITTER
CYCLE-TO-CYCLE JITTER
OUTPUT RISE/FALL TIME
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
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8430B-71 Data Sheet
APPLICATION INFORMATION
POWER SUPPLY FILTERING TECHNIQUES
As in any high speed analog circuitry, the power supply
pins are vulnerable to random noise. The 8430B-71 provides separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V CC, V CCA, and
V CCO should be individually connected to the power supply
plane through vias, and bypass capacitors should be
used for each pin. To achieve optimum jitter performance,
power supply isolation is required. Figure 1 illustrates how
a 10Ω resistor along with a 10μF and a .01μF bypass
capacitor should be connected to each VCCA pin.
3.3V
VCC
.01μF
10Ω
VCCA
.01μF
10μF
FIGURE 1. POWER SUPPLY FILTERING
RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS
INPUTS:
OUTPUTS:
CRYSTAL INPUT:
For applications not requiring the use of the crystal oscillator input,
both XTAL_IN and XTAL_OUT can be left floating. Though not
required, but for additional protection, a 1kΩ resistor can be tied
from XTAL_IN to ground.
LVPECL OUTPUT
All unused LVPECL outputs can be left floating. We recommend
that there is no trace attached. Both sides of the differential output
pair should either be left floating or terminated.
TEST_CLK INPUT:
For applications not requiring the use of the test clock, it can be left
floating. Though not required, but for additional protection, a 1kΩ
resistor can be tied from the TEST_CLK to ground.
LVCMOS CONTROL PINS:
All control pins have internal pull-ups or pull-downs; additional
resistance is not required but can be added for additional protection.
A 1kΩ resistor can be used.
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8430B-71 Data Sheet
CRYSTAL INPUT INTERFACE
A crystal can be characterized for either series or parallel mode
operation. The 8430B-71 has a built-in crystal oscillator circuit.
This interface can accept either a series or parallel crystal without
additional components and generate frequencies with accuracy
suitable for most applications. Additional accuracy can be achieved
by adding two small capacitors C1 and C2 as shown in Figure 2.
FIGURE 2. CRYSTAL INPUt INTERFACE
LVCMOS TO XTAL INTERFACE
The XTAL_IN input can accept a single-ended LVCMOS signal
through an AC coupling capacitor. A general interface diagram is
shown in Figure 3. The XTAL_OUT pin can be left floating. The
input edge rate can be as slow as 10ns. For LVCMOS inputs, it
is recommended that the amplitude be reduced from full swing to
half swing in order to prevent signal interference with the power
rail and to reduce noise. This configuration requires that the output
impedance of the driver (Ro) plus the series resistance (Rs) equals
the transmission line impedance. In addition, matched termination
at the crystal input will attenuate the signal in half. This can be done
in one of two ways. First, R1 and R2 in parallel should equal the
transmission line impedance. For most 50Ω applications, R1 and
R2 can be 100Ω. This can also be accomplished by removing R1
and making R2 50Ω.
VDD
VDD
R1
Ro
Rs
.1uf
Zo = 50
XTAL_IN
R2
Zo = Ro + Rs
XTAL_OUT
FIGURE 3. GENERAL DIAGRAM FOR LVCMOS DRIVER TO XTAL INPUT INTERFACE
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8430B-71 Data Sheet
TERMINATION FOR LVPECL OUTPUTS
lines. Matched impedance techniques should be used to maximize
operating frequency and minimize signal distortion. There are a few
simple termination schemes. Figures 4A and 4B show two different
layouts which are recommended only as guidelines. Other suitable
clock layouts may exist and it would be recommended that the board
designers simulate to guarantee compatibility across all printed
circuit and clock component process variations.
The clock layout topology shown below is a typical termination for
LVPECL outputs. The two different layouts mentioned are recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that generate
ECL/LVPECL compatible outputs. Therefore, terminating resistors
(DC current path to ground) or current sources must be used for
functionality. These outputs are designed to drive 50Ω transmission
FIGURE 4A. LVPECL OUTPUT TERMINATION
©2015 Integrated Device Technology, Inc
FIGURE 4B. LVPECL OUTPUT TERMINATION
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8430B-71 Data Sheet
LAYOUT GUIDELINE
The schematic of the 8430B-71 layout example used in this layout
guideline is shown in Figure 5A. The 8430B-71 recommended PCB
board layout for this example is shown in Figure 5B. This layout
example is used as a general guideline. The layout in the actual
M4
M3
M2
M1
M0
VCO_SEL
nP_LOAD
X_IN
VCC
ICS8430B-71
X_OUT
TEST_CLK
XTAL_SEL
VCCA
S_LOAD
S_DATA
S_CLOCK
MR
TEST
VCC
FOUT1
nFOUT1
VCCO
FOUT0
nFOUT0
VEE
M5
M6
M7
M8
N0
N1
N2
VEE
9
10
11
12
VCC
13
FOUT
14
FOUTN 15
16
U1
1
2
3
4
5
6
7
8
C2
X1
32
31
30
29
28
27
26
25
C1
system will depend on the selected component types, the density
of the components, the density of the traces, and the stack up of
the P.C. board.
C14
0.1u
C15
0.1u
VCC
24
23
22
21
20
19
18
17
REF_IN
XTAL_SEL
S_LOAD
S_DATA
S_CLOCK
R7
10
VCCA
C11
0.01u
C16
10u
VCC
Zo = 50 Ohm
R1
125
R3
125
IN+
TL1
Zo = 50 Ohm
+
IN-
TL2
R2
84
R4
84
FIGURE 5A. SCHEMATIC OF RECOMMENDED LAYOUT
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8430B-71 Data Sheet
The following component footprints are used in this layout
example: All the resistors and capacitors are size 0603.
• The traces with 50Ω transmission lines TL1 and TL2
at FOUT and nFOUT should have equal delay and
run adjacent to each other. Avoid sharp angles on the
clock trace. Sharp angle turns cause the characteristic
impedance to change on the transmission lines.
POWER AND GROUNDING
Place the decoupling capacitors C14 and C15 as close as possible
to the power pins. If space allows, placing the decoupling capacitor
at the component side is preferred. This can reduce unwanted
inductance between the decoupling capacitor and the power pin
generated by the via.
• Keep the clock trace on the same layer. Whenever possible, avoid any vias on the clock traces. Any via on the
trace can affect the trace characteristic impedance and
hence degrade signal quality.
• To prevent cross talk, avoid routing other signal traces
in parallel with the clock traces. If running parallel traces
is unavoidable, allow more space between the clock trace
and the other signal trace.
Maximize the pad size of the power (ground) at the decoupling
capacitor. Maximize the number of vias between power (ground)
and the pads. This can reduce the inductance between the power
(ground) plane and the component power (ground) pins.
• Make sure no other signal trace is routed between the
clock trace pair.
If VCCA shares the same power supply with VCC, insert the RC
filter R7, C11, and C16 in between. Place this RC filter as
close to the VCCA as possible.
The matching termination resistors R1, R2, R3 and R4 should
be located as close to the receiver input pins as possible. Other
termination schemes can also be used but are not shown in this
example.
CLOCK TRACES AND TERMINATION
The component placements, locations and orientations should
be arranged to achieve the best clock signal quality. Poor clock
signal quality can degrade the system performance or cause
system failure. In the synchronous high-speed digital system,
the clock signal is less tolerable to poor signal quality than
other signals. Any ringing on the rising or falling edge or excessive
ring back can cause system failure. The trace shape and the trace
delay might be restricted by the available space on the board and
the component location. While routing the traces, the clock signal
traces should be routed first and should be locked prior to routing
other signal traces.
CRYSTAL
The crystal X1 should be located as close as possible to the
pins 24 (XTAL_OUT) and 25 (XTAL_IN). The trace length between
the X1 and U1 should be kept to a minimum to avoid unwanted
parasitic inductance and capacitance. Other signal traces should
not be routed near the crystal traces.
FIGURE 5B. PCB BOARD LAYOUT FOR 8430B-71
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8430B-71 Data Sheet
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the 8430B-71.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the 8430B-71 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for VCC = 3.3V + 5% = 3.465V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
Power (core)MAX = VCC_MAX * IEE_MAX = 3.465V * 140mA = 485mW
Power (outputs)MAX = 30mW/Loaded Output pair
If all outputs are loaded, the total power is 2 * 30mW = 60mW
Total Power_MAX (3.465V, with all outputs switching) = 485mW + 60mW = 545mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the
device. The maximum recommended junction temperature for HiPerClockSTM devices is 125°C.
The equation for Tj is as follows: Tj = θJA * Pd_total + TA
Tj = Junction Temperature
θJA = Junction-to-Ambient Thermal Resistance
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
TA = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance θJA must be used. Assuming a
moderate air flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 42.1°C/W per Table 8 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 0.545Ω * 42.1°C/W = 93°C. This is well below the limit of 125°C.
This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow,
and the type of board (single layer or multi-layer).
TABLE 8. THERMAL RESISTANCE θJA FOR 32-PIN LQFP, FORCED CONVECTION
θJA by Velocity (Linear Feet per Minute)
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
0
200
500
67.8°C/W
47.9°C/W
55.9°C/W
42.1°C/W
50.1°C/W
39.4°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
©2015 Integrated Device Technology, Inc
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8430B-71 Data Sheet
3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
LVPECL output driver circuit and termination are shown in Figure 6.
FIGURE 6. LVPECL DRIVER CIRCUIT AND TERMINATION
To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination
voltage of VCCO- 2V.
•
For logic high, VOUT = VOH_MAX = VCCO_MAX – 0.9V
(VCCO_MAX - VOH_MAX) = 0.9V
•
For logic low, VOUT = VOL_MAX = VCCO_MAX – 1.7V
(VCCO_MAX - VOL_MAX) = 1.7V
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(VOH_MAX – (VCCO_MAX - 2V))/RL] * (VCCO_MAX - VOH_MAX) = [(2V - (VCCO_MAX - VOH_MAX))/RL] * (VCCO_MAX - VOH_MAX) =
[(2V - 0.9V)/50Ω] * 0.9V = 19.8mW
Pd_L = [(VOL_MAX – (VCCO_MAX - 2V))/RL] * (VCCO_MAX - VOL_MAX) = [(2V - (VCCO_MAX - VOL_MAX))/RL] * (VCCO_MAX - VOL_MAX) =
[(2V - 1.7V)/50Ω] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
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8430B-71 Data Sheet
RELIABILITY INFORMATION
TABLE 9. θJAVS. AIR FLOW TABLE FOR 32 LEAD LQFP
θJA by Velocity (Linear Feet per Minute)
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
0
200
500
67.8°C/W
47.9°C/W
55.9°C/W
42.1°C/W
50.1°C/W
39.4°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TRANSISTOR COUNT
The transistor count for 8430B-71 is: 3948
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8430B-71 Data Sheet
PACKAGE OUTLINE - Y SUFFIX FOR 32 LEAD LQFP
TABLE 10. PACKAGE DIMENSIONS
JEDEC VARIATION
ALL DIMENSIONS IN MILLIMETERS
BBA
SYMBOL
MINIMUM
NOMINAL
N
MAXIMUM
32
A
1.60
A1
0.05
A2
1.35
1.40
1.45
b
0.30
0.37
0.45
c
0.09
0.15
0.20
D
9.00 BASIC
D1
7.00 BASIC
D2
5.60
E
9.00 BASIC
E1
7.00 BASIC
E2
5.60
e
0.80 BASIC
L
0.45
θ
0°
0.60
0.75
7°
ccc
0.10
Reference Document: JEDEC Publication 95, MS-026
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8430B-71 Data Sheet
TABLE 11. ORDERING INFORMATION
Part/Order Number
Marking
Package
8430BY-71LF
ICS8430BY71L
8430BY-71LFT
ICS8430BY71L
©2015 Integrated Device Technology, Inc
Shipping Packaging
Temperature
32 lead “Lead Free” LQFP
Tray
0°C to +70°C
32 lead “Lead Free” LQFP
Tape and Reel
0°C to +70°C
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8430B-71 Data Sheet
REVISION HISTORY SHEET
Rev
Table
Page
A
T11
17
A
Description of Change
Date
Ordering Information Table - corrected “Temperature” column
11/20/06
Updated data sheet format.
11/30/15
©2015 Integrated Device Technology, Inc
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8430B-71 Data Sheet
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