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525-01RLFT

P1-P3P4-P6P7-P9
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 Comparator,
Charge Pump, 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 - 70
C -40 to +85C 0 - 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 +85
C -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
P1-P3P4-P6P7-P9

525-01RLFT

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Clock Generators & Support Products USER CONFIGURABLE CLOCK
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