DATASHEET
USER CONFIGURABLE CLOCK ICS525-01/02
IDT®
USER CONFIGURABLE CLOCK 1
ICS525-01/02 REV U 033015
Description
The ICS525-01/02 are the most flexible way to generate
a high-quality, high-accuracy, high-frequency clock
output from an inexpensive crystal or clock input. The
user can 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
(PLL) techniques, the device accepts a standard
fundamental mode, inexpensive crystal to produce
output clocks up to 250 MHz. It can also produce a
highly accurate output clock from a given input clock,
keeping them frequency locked together.
For similar capability with a serial interface, use the
ICS307. For simple multipliers to produce common
frequencies, refer to the ICS50x family of parts, which
are smaller and more cost effective.
These products are intended for clock generation. They
have 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 ICS527-01.
Features
•Packaged as 28-pin SSOP (150 mil body)
•Industrial and commercial versions available in Pb
(lead) free package
•User determines the output frequency by setting all
internal dividers
•Eliminates need for custom oscillators
•No software needed
•Online calculator determines register settings
•Pull-ups on all select inputs
•Input crystal frequency of 5 - 27 MHz
•Input clock frequency of 2 - 50 MHz
•Very low jitter
•Duty cycle of 45/55 up to 200 MHz
•Operating voltage of 3.0 V or 5.5 V
•Ideal for oscillator replacement
•Industrial temperature version available
•For Zero Delay, refer to the ICS527
Block Diagram
VDD
GND
2
2
CLK
REF
Reference
Divider
Phase C om parator,
Charge Pum p, and
Loop Filter VCO
VCO
Divider
Output
Divider
973
R6:R0 V8:V0 S2:S0
X1/ICLK
X2
Crystal or clock
input
Optional crystal capacitors
Crystal
Oscillator
PD
ICS525-01/02
USER CONFIGURABLE CLOCK CLOCK MULTIPLIER
IDT®
USER CONFIGURABLE CLOCK 2
ICS525-01/02 REV U 033015
Pin Assignment
Pin Descriptions
KEY: I(PU) = Input with internal pull-up resistor; X1, X2 = crystal connections
18
7
17
8
16
9
15
X1/ICLK
10
X2
11
GND
12
CLK
13
V0
14
V1
GND
PD
V8
V2 V7
V5
V3 V6
22
21
20
19
V4
REF
5
6
S2
VDD VDD
24
23 R0
3
4
S0
S1 R1
26
25 R2
1
2
R5
R6 R3
28
27 R4
ICS525-01/-02
Pin
Number
Pin
Name
Pin
Type Pin Description
1, 2,
24-28
R5, R6,
R0-R4
I(PU) Reference divider word input pins determined by user. Forms a binary number from 0
to 127.
3, 4, 5 S0, S1, S2 I(PU) Select pins for output divider determined by user. See table on page 3
6, 23 VDD Power Connect to VDD.
7 X1/ICLK X1 Crystal connection. Connect to a parallel resonant fundamental crystal or input clock.
8 X2 X2 Crystal connection. Connect to a crystal or leave unconnected for clock.
9, 20 GND Power Connect to ground.
10 - 18 V0 - V8 I(PU) VCO divider word input pins determined by user. Forms a binary number from 0 to
511.
19 PD Input Power-down. Active low. Turns off entire chip when low. Clock outputs tri-stated.
21 CLK Output Output clock determined by status of R0-R6, V-V8, S0-S2, and input frequency.
22 REF Output Reference output. Buffered crystal oscillator (or clock ) output.
ICS525-01/02
USER CONFIGURABLE CLOCK CLOCK MULTIPLIER
IDT®
USER CONFIGURABLE CLOCK 3
ICS525-01/02 REV U 033015
ICS525-01 Output Frequency and Output Divider Table
ICS525-02 Output Frequency and Output Divider Table
S2
Pin 5
S1
Pin 4
S0
Pin 3
CLK Output
Divider
Output Frequency Range (MHz)
VDD = 5 V VDD = 3.3 V
0 - 70C-40 to +85C0 - 70C-40 to +85C
0 0 0 10 3–26 3–23 3–18 3–16
0 0 1 2 15–160 15–140 15–100 15–90
0 1 0 8 3.75–40 3.75–36 3.75–25 3.75–22
0 1 1 4 7.5–80 7.5–72 7.5–50 7.5–45
1 0 0 5 6–50 6–45 6–34 6–30
1 0 1 7 4–40 4–36 4–26 4–23
1 1 0 9 3.3–33.3 3.3–30 3.3–20 3.3–18
1 1 1 6 5–53 5–47 5–27 5–24
S2
Pin 5
S1
Pin 4
S0
Pin 3
CLK Output
Divider
Output Frequency Range (MHz)
VDD = 5 V VDD = 3.3 V
-40 to +85C-40 to +85C
0 0 0 6 5–67 5–40
0 0 1 2 15–200 15–120
0 1 0 8 3.75–50 3.75–30
0 1 1 4 7.5–100 7.5–60
1 0 0 5 6–80 6–48
1 0 1 7 4–57 4–34
1 1 0 1 30–250 30–200
1 1 1 3 10–133 10–80
ICS525-01/02
USER CONFIGURABLE CLOCK CLOCK MULTIPLIER
IDT®
USER CONFIGURABLE CLOCK 4
ICS525-01/02 REV U 033015
External Components/Crystal
Selection
Decoupling Capacitors
The ICS525-01/02 requries two 0.01µF decoupling
capacitors to be connected between VDD and GND,
one on each side of the chip. The capacitor must be
connected close to the device to minimize lead
inductance.
External Resistors
A 33series termination resistor should be used on the
CLK and REF pins.
Crystal Load Capacitors
The approximate total on-chip capacitance for a crystal
is 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 in pF. 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).
Determining the Output Frequency
Users have full control in setting the desired output
frequency over the range shown in the tables on pages
3-4. 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 will automatically produce the correct
frequency 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.
Configuration Pin Settings
The output of the ICS525 can be determined by the
following simple equation:
Where:
Reference Divider Word (RDW) = 0 to 127 (0 not
permitted for ICS525-01)
VCO Divider Word (VDW) = 0 to 511 (0, 1, 2, 3 not
permitted for ICS525-01)
Output Divider (OD) = values on pages 3-4
Also, the following operating ranges should be
observed:
1. The output frequency must be in the ranges listed on
pages 3-4.
2. The phase detector frequency must be above 200
kHz.
Since all of the inputs have pull-up resistors, it is only
necessary to ground the pins that need to be set to zero.
Which Part to Use?
The ICS525-01 is the original configurable clock.
The ICS525-02 has a higher maximum output
grequency and a slightly different set of output dividers.
To determine the best combination of VCO, reference,
and output divide, use the ICS525 Calculator on our
web site.
CLK Frequency Input Frequency 2x VDW 8+
RDW 2+OD
---------------------------------------------
=
200kHz InputFrequency
RDW 2+
-----------------------------------------------<
ICS525-01/02
USER CONFIGURABLE CLOCK CLOCK MULTIPLIER
IDT®
USER CONFIGURABLE CLOCK 5
ICS525-01/02 REV U 033015
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS525-01/02. 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.
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V
Item Rating
Supply Voltage, VDD 7 V
All Inputs and Outputs -0.5 V to VDD+0.5 V
Ambient Operating Temperature, Commercial 0 to +70C
Ambient Operating Temperature, Industrial -40 to +85C
Storage Temperature -65C to 150C
Junction Temperature 125C
Soldering Temperature 260C (max. of 10 seconds)
Parameter Symbol Conditions Min. Typ. Max. Units
Operating Voltage VDD 3.0 5.5 V
Operating Supply Current IDD 60 MHz out, no load,
15 MHz crystal,
ICS525-01/02 only
8mA
Operating Supply Current,
Power-down
IDD Pin 19 = 0, Note 1 4 µA
Input High Voltage VIH 2V
Input Low Voltage VIL 0.8 V
Input High Voltage,
X1/ICLK only
VIH ICLK (pin7) VDD/2+1 VDD/2 V
Input Low Voltage, X1/ICLK
only
VIL ICLK (pin7) VDD/2 VDD/2-1 V
Output High Voltage VOH IOH = -12 mA VDD-0.4 V
Output Low Voltage VOL IOL = 12 mA 0.4 V
Short Circuit Current CLK and REF outputs ±55 mA
Input Capacitance CIN V, R, S pins and pin 19 4 pF
On-chip Pull-up Resistor RPU V, R, S pins and pin 19 270 k
ICS525-01/02
USER CONFIGURABLE CLOCK CLOCK MULTIPLIER
IDT®
USER CONFIGURABLE CLOCK 6
ICS525-01/02 REV U 033015
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V
NOTE 1: Phase relationship between input and output can change at power-up. For a fixed phase
relationship, see the ICS527.
NOTE 2: For 16 MHz, 100 MHz output. Use the -02 for lowest jitter.
Parameter Symbol Conditions Min. Typ. Max. Units
Input Frequency FIN
Crystal input 5 27 MHz
Clock input 2 50 MHz
Output Clock Rise Time 0.8 to 2.0 V 1 ns
Output Clock Fall Time 2.0 to 0.8 V 1 ns
Output Clock Duty Cycle, OD =
2, 4, 6, 8, or 10 At VDD/2 45 49 to
51 55 %
Output Clock Duty Cycle, OD =
3, 5, 7, or 9 At VDD/2 40 60 %
Output Clock Duty Cycle, OD =
1 (-02 only) At VDD/2 35 65
Power-down Time, PD low to
clocks stopped 50 ns
Power-up Time, PD high to
clocks stable 10 ms
Absolute Clock Period Jitter,
ICS525-01, Note 2 tja Deviation from mean ±140 ps
One Sigma Clock Period Jitter,
ICS525-01, Note 2 tjs One Sigma 45 ps
Absolute Clock Period Jitter,
ICS525-02, Note 2 tja Deviation from mean ±85 ps
One Sigma Clock Period Jitter,
ICS525-02, Note 2 tjs One Sigma 30 ps
ICS525-01/02
USER CONFIGURABLE CLOCK CLOCK MULTIPLIER
IDT®
USER CONFIGURABLE CLOCK 7
ICS525-01/02 REV U 033015
Package Outline and Package Dimensions (28-pin SSOP, 150 mil Body)
Package dimensions are kept current with JEDEC Publication No. 95, MO-153
INDEX
AREA
1 2
28
D
E1 E
SEATING
PLANE
A
1
A
A
2
e
- C -
b
aaa C
c
L
*For reference only. Controlling dimensions in mm.
Millimeters Inches*
Symbol Min Max Min Max
A 1.351.75.053.069
A1 0.10 0.25 .0040 .010
A2 -- 1.50 -- .059
b 0.200.30.008.012
C 0.180.25.007.010
D 9.80 10.00 .386 .394
E 5.806.20.228.244
E1 3.80 4.00 .150 .157
e 0.635 Basic 0.025 Basic
L 0.401.27.016.050
0808
aaa -- 0.10 -- 0.004
ICS525-01/02
USER CONFIGURABLE CLOCK CLOCK MULTIPLIER
IDT®
USER CONFIGURABLE CLOCK 8
ICS525-01/02 REV U 033015
Ordering Information
Parts that are ordered with a "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.
Revision History
Rev. U – removed -11 and -12 references/parts from datasheet. The devices are obsolete.
Part / Order Number Marking Shipping Packaging Package Temperature
525-01RLF ICS525-01RLF Tubes 28-pin SSOP 0 to +70C
525-01RLFT ICS525-01RLF Tape and Reel 28-pin SSOP 0 to +70C
525-01RILF ICS525-01RILF Tubes 28-pin SSOP -40 to +85C
525-01RILFT ICS525-01RILF Tape and Reel 28-pin SSOP -40 to +85C
525R-02LF ICS525R-02LF Tubes 28-pin SSOP 0 to +70C
525R-02LFT ICS525R-02LF Tape and Reel 28-pin SSOP 0 to +70C
525R-02ILF ICS525R-02ILF Tubes 28-pin SSOP -40 to +85C
525R-02ILFT ICS525R-02ILF Tape and Reel 28-pin SSOP -40 to +85C
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ICS525-01/02
USER CONFIGURABLE CLOCK CLOCK MULTIPLIER