DATASHEET
USER CONFIGURABLE CLOCK
ICS525-01/02/11/12
Description
Features
The ICS525-01/02/11/12 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.
• 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
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.
Block Diagram
VDD
2
PD
X1/ICLK
CLK
REF
Phase Comparator,
Charge Pump, and
Loop Filter
Reference
Divider
Crystal
Oscillator
VCO
Crystal or clock
input
Output
Divider
X2
VCO
Divider
Optional crystal capacitors
2
7
9
3
GND
R6:R0
V8:V0
S2:S0
IDT™ / ICS™ USER CONFIGURABLE CLOCK
1
ICS525-01/02/11/12 REV S 042407
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
