DATASHEET
ICS525-04
OSCAR™ USER CONFIGURABLE PECL CLOCK
Description
Features
The ICS525-04 OSCaRTM is the most flexible way to
generate a high quality, high frequency differential PECL
clock output from a crystal or CMOS clock input. The name
OSCaRTM stands for Oscillator Replacement, as it is
designed to replace crystal oscillators in almost any
electronic system. Users can easily configure the device to
produce nearly any output frequency from any input
frequency by grounding or floating the select pins. Neither
microcontroller, software, nor device programmer are
needed to set the frequency. Using Phase Locked Loop
techniques, the device accepts a crystal or clock to produce
output clocks up to 156 MHz at 3.3V, keeping them
frequency locked together.
• Packaged as 28 pin SSOP (150 mil body)
• Highly accurate frequency generation
• User determines the output frequency by setting all
•
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•
•
•
•
•
•
•
•
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internal dividers
Eliminates need for custom oscillators
No software needed
Pull-ups on select inputs
Input crystal frequency of 5 - 27 MHz
Input clock frequency of 2 - 50 MHz
Output clock frequencies up to 156 MHz at 3.3V
Output clock frequencies up to 200 MHz at 5V
Very low jitter
PECL levels set by external resistors
Operating voltage of 3.3V or 5V
Ideal for oscillator replacement
Industrial temperature version available
Advanced, low power CMOS process
2
VDD
For simple multipliers to produce common frequencies,
refer to the LOCOTM family of parts, which are smaller and
more cost effective.
This product is intended for clock generation. It has low
output jitter (variation in the output period), but input to
output skew and jitter are not defined nor guaranteed. For
applications which require defined input to output timing,
use the ICS527-02.
Block Diagram
560Ω
VDD
82Ω
X1/ICLK
Crystal or
clock input
VDD
RES
Crystal
Oscillator
Reference
Divider
PECL
Phase Comparator,
Charge Pump, and
Loop Filter
VCO
820Ω
Output
Divider
X2
VCO
Divider
Optional crystal capacitors
GND
VDD
82Ω
PECL
820Ω
7
R6:R0
IDT™ / ICS™ OSCAR™ USER CONFIGURABLE PECL CLOCK
9
V8:V0
1
2
GND
3
S2:S0
GND
ICS525-04
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ICS525-04
OSCAR™ USER CONFIGURABLE PECL CLOCK
PECL MULTIPLIER
Pin Assignment
R5
1
28
R4
R6
2
27
R3
S0
3
26
R2
S1
4
25
R1
S2
5
24
R0
VDD
6
23
VDD
X1/ICLK
7
22
PECL
X2
8
21
PECL
GND
9
20
GND
V0
10
19
RES
V1
11
18
V8
V2
12
17
V7
V3
13
16
V6
V4
14
15
V5
28 pin 150 mil body SSOP
Maximum Output Frequency and Output Divider Table
S2
S1
S0 CLK Output
Pin 5 Pin 4 Pin 3
Divider
Max Output Frequency (MHz)
VDD = 5V
VDD = 3.3V
0 - 70 ° C
-40 - 85 ° C
0 - 70 ° C
-40 - 85 ° C
0
0
0
6
45
44
27
26
0
0
1
2
120
117
81
77
0
1
0
8
34
33
20
19
0
1
1
4
68
66
40
38
1
0
0
5
54
53
32
31
1
0
1
7
39
38
23
22
1
1
0
1
200
195
162
154
1
1
1
3
90
89
54
51
IDT™ / ICS™ OSCAR™ USER CONFIGURABLE PECL CLOCK
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OSCAR™ USER CONFIGURABLE PECL CLOCK
PECL MULTIPLIER
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
1
R5
Input
Reference divider word input pins determined by user. Forms a binary number from 0
to 127. Internal pull-up.
2
R6
Input
Reference divider word input pins determined by user. Forms a binary number from 0
to 127. Internal pull-up.
3
S0
Input
Select pins for output divider determined by user. See table above. Internal pull-up.
4
S1
Input
Select pins for output divider determined by user. See table above. Internal pull-up.
5
S2
Input
Select pins for output divider determined by user. See table above. Internal pull-up.
6
VDD
Power
Connect to VDD.
7
X1/ICLK
Input
Crystal connection. Connect to a parallel resonant crystal or input clock.
8
X2
Input
Crystal connection. Connect to a crystal or leave unconnected for clock.
9
GND
Power
Connect to ground.
10 - 18
V0 - V8
Input
VCO divider word input pins determined by user. Forms a binary number from 0 to
511. Internal pull-up.
19
RES
Input
Bias resistor input. Connect a resistor between this pin and VDD.
20
GND
Power
Connect to ground.
21
PECL
Output
Complementary PECL output. Connect resistor load to this pin.
22
PECL
Output
PECL output. Connect resistor load to this pin.
23
VDD
Power
Connect to VDD.
24
R0
Input
Reference divider word input pins determined by user. Forms a binary number from 0
to 127. Internal pull-up.
25
R1
Input
Reference divider word input pins determined by user. Forms a binary number from 0
to 127. Internal pull-up.
26
R2
Input
Reference divider word input pins determined by user. Forms a binary number from 0
to 127. Internal pull-up.
27
R3
Input
Reference divider word input pins determined by user. Forms a binary number from 0
to 127. Internal pull-up.
28
R4
Input
Reference divider word input pins determined by user. Forms a binary number from 0
to 127. Internal pull-up.
Pin Description
IDT™ / ICS™ OSCAR™ USER CONFIGURABLE PECL CLOCK
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ICS525-04
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OSCAR™ USER CONFIGURABLE PECL CLOCK
PECL MULTIPLIER
External Components
The output of the ICS525-04 can be determined by the
following simple equation:
Decoupling Capacitors
VDW + 8
PECL Frequency = Input Frequency × --------------------------------------------( RDW + 2 ) • OD
As with any high performance mixed-signal IC, the
ICS525-04 must be isolated from system power supply
noise to perform optimally.
Where:
Decoupling capacitors of 0.01µF must be connected
between each VDD and the GND, one on each side of the
chip.The capacitor must be connected close to the device to
minimize lead inductance. No external power supply filtering
is required for this device.
Reference Divider Word (RDW) = 0 to 127
VCO Divider Word (VDW) = 0 to 511
Output Divider (OD) = values on page 2
External Resistors
Also, the following operating ranges should be observed:
A 560Ω resistor must be connected between RES (pin 19)
and VDD. A total of four resistors are needed for the PECL
outputs as shown on the block diagram on page 1. The
value of these resistors are shown, but can be varied to
change the differential pair output swing and the common
mode voltage. Consult application note MAN09 for more
information.
VDW + 8
10M < Input Frequency x ----------------------------- < 200M ( 5V )or162M ( 3.3v ) )
( RDW + 2 )
InputFrequency
200kHz < ----------------------------------------------( RDW + 2 )
Crystal Load Capacitors
The total on-chip capacitance for a crystal is approximately
16 pF, so a parallel resonant, fundamental mode crystal with
this value of load (correlation) capacitance should be used.
For crystals with a specified load capacitance greater than
16 pF, crystal capacitors may be connected from each of the
pins X1 and X2 to Ground as shown in the block diagram.
The value (in pF) of these crystal caps should be (CL 16)*2, where CL is the crystal load capacitance. These
external capacitors are only required for applications where
the exact frequency is critical. For a clock input, connect to
X1 and leave X2 unconnected (no capacitors on either).
See table on page 2 for full details of maximum output.
The dividers are expressed as integers. For example, if a
66.66 MHz output on CLK1 is desired from a 14.31818 MHz
input, the VCO divider word (VDW) should be 276, with an
output divide (OD) of 2. In this example, R6:R0 is 0111011,
V8:V0 is 100010100 and S2:S0 is 001. Since all of these
inputs have pull-up resistors, it is only necessary to ground
the zero pins, namely V7, V6, V5, V3, V1, V0, R6, R2, S2,
and S1.
Determining the Output Frequency
To determine the best combination of VCO, reference, and
output divide, use the ICS525 Calculator on our web site:
www.idt.com. The online form is easy to use and quickly
shows you up to three options for these settings.
Users have full control in setting the desired output
frequency over the range shown in the table on page 2. To
replace a standard oscillator, users should connect the
divider select input pins directly to ground (or VDD, although
this is not required because of internal pull-ups) during
Printed Circuit Board layout. The ICS525-04 will
automatically produce the correct clock when all
components are soldered. It is also possible to connect the
inputs to parallel I/O ports to switch frequencies. By
choosing divides carefully, the number of inputs which need
to be changed can be minimized. Observe the restrictions
on allowed values of VDW and RDW.
IDT™ / ICS™ OSCAR™ USER CONFIGURABLE PECL CLOCK
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ICS525-04
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OSCAR™ USER CONFIGURABLE PECL CLOCK
PECL MULTIPLIER
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS525-04. These ratings, which are
standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at
these or any other conditions above those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical
parameters are guaranteed only over the recommended operating temperature range.
Item
Rating
Supply Voltage, VDD
7V
All Inputs and Outputs
-0.5V to VDD+0.5V
Ambient Operating Temperature
-40 to +85° C
Storage Temperature
-65 to +150° C
Junction Temperature
175° C
Soldering Temperature
260° C
Recommended Operation Conditions
Parameter
Min.
Typ.
Max.
Units
Ambient Operating Temperature, ICS525R-04
0
+70
°C
Ambient Operating Temperature, ICS525R-04I
-40
+85
°C
Power Supply Voltage (measured in respect to GND)
+3.0
+5.5
V
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3V ±10%, Ambient Temperature 0 to +70° C
Parameter
Symbol
Operating Voltage
VDD
Supply Current
IDD
Conditions
Min.
Typ.
3.0
Max.
Units
5.5
V
15 MHz in, 60MHz out,
no load
34
mA
15MHz in, 60MHz out,
VDD = 5V
60
mA
Input High Voltage
VIH
Input Low Voltage
VIL
Input High Voltage
VIH
X1/ICLK only
Input Low Voltage
VIL
X1/ICLK only
Output High Voltage
VOH
IOH = -12 mA
Output Low Voltage
VOL
IOL = 12 mA
Input Capacitance
CIN
V, R, S select pins
5
pF
On-chip pull-up resistor
RPU
V, R, S select pins
270
kΩ
2
V
0.8
IDT™ / ICS™ OSCAR™ USER CONFIGURABLE PECL CLOCK
5
VDD/2+1
VDD/2
VDD/2
V
V
VDD/2-1
2.4
V
V
0.4
ICS525-04
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OSCAR™ USER CONFIGURABLE PECL CLOCK
PECL MULTIPLIER
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3V ±5%, Ambient Temperature -40 to +85° C
Parameter
Input Frequency
Symbol
FIN
Output Frequency with OD=2,
VDD=4.5 to 5
FOUT
Output Frequency with OD=2,
VDD=3.0 to 3.3
FOUT
Absolute Clock Period Jitter
tja
One sigma Clock Period Jitter
tjs
IDT™ / ICS™ OSCAR™ USER CONFIGURABLE PECL CLOCK
Conditions
Min.
Typ.
Max.
Units
Crystal input
5
27
MHz
Clock input
2
50
MHz
0 to +70° C
1
120
MHz
-40 to +85° C
1
117
MHz
0 to +70° C
1
81
MHz
-40 to +85° C
1
77
MHz
Deviation from mean
6
± 50
ps
20
ps
ICS525-04
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OSCAR™ USER CONFIGURABLE PECL CLOCK
PECL MULTIPLIER
Package Outline and Package Dimensions (28 pin SSOP, 150 mil Body, 0.025 mm Pitch)
Package dimensions are kept current with JEDEC Publication No. 95, MO-153
Millimeters
28
Symbol
E1
A
A1
A2
b
C
D
E
E1
e
L
α
aaa
E
INDEX
AREA
1 2
D
A
2
Min
Inches
Max
1.35
1.75
0.10
0.25
-1.50
0.20
0.30
0.18
0.25
9.80
10.00
5.80
6.20
3.80
4.00
0.635 Basic
0.40
1.27
0°
8°
-0.10
Min
Max
.053
.069
.0040
.010
-.059
.008
.012
.007
.010
.386
.394
.228
.244
.150
.157
0.025 Basic
.016
.050
0°
8°
-0.004
A
A
1
c
-Ce
SEATING
PLANE
b
L
aaa C
Ordering Information
Part / Order Number
Marking
Shipping Packaging
Package
Temperature
525R-04LF
ICS525R-04LF
Tubes
28-pin SSOP
0 to +70° C
525R-04LFT
ICS525R-04LF
Tape and Reel
28-pin SSOP
0 to +70° C
525R-04ILF
ICS525R-04ILF
Tubes
28-pin SSOP
-40 to +85° C
525R-04ILFT
ICS525R-04ILF
Tape and Reel
28-pin SSOP
-40 to +85° C
"LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant.
While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) assumes
no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No
other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications
such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not
recommended without additional processing by IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT
does not authorize or warrant any IDT product for use in life support devices or critical medical instruments.
IDT™ / ICS™ OSCAR™ USER CONFIGURABLE PECL CLOCK
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OSCAR™ USER CONFIGURABLE PECL CLOCK
PECL MULTIPLIER
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