DATASHEET
PECL INPUT OSCAR™ USER CONFIGURABLE CLOCK ICS525-03
IDT®
PECL INPUT OSCAR™ USER CONFIGURABLE CLOCK 1
ICS525-03 REV L 010311
Description
The ICS525-03 are the most flexible way to generate a
high-quality, high-accuracy, high-frequency clock
output from a PECL input. The name OSCaR stands
for OSCillator Replacement, as they are designed to
replace crystal oscillators in almost any electronic
system. 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 PECL
clock to produce output clocks up to 250 MHz, keeping
them frequency locked together. Resistors are for
PECL outputs only.
For simple multipliers to produce common frequencies,
refer to the LOCO
TM
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.
Features
• Packaged as 28-pin SSOP (150 mil body)
• Highly accurate frequency generation
• User determines the output frequency by setting all
internal dividers
• Eliminates need for custom oscillators
• No software needed
• Pull-ups on all select inputs
• PECL input clock frequency of 0.5 to 250 MHz
• Output clock frequencies up to 250 MHz
• Very low jitter
• Operating voltage of 3.0 V or 5.5 V
• 25 mA drive capability at TTL levels
• Ideal for oscillator replacement
• Industrial temperature
• Pb (lead) free package
• Advanced, low-power CMOS process
Block Diagram
VDD
GND
2
2
CLK1
CLK2
Reference
Divider
Phase Comparator,
Charge Pump, and
Loop Filter
VCO
VCO
Divider
Output
Divider
973
R6:R0 V8:V0 S2:S0
PECLIN
PECLIN
VDD
VDD
270 Ohm
270 Ohm
62 Ohm
62 Ohm
RES
