• Packaged as 28 pin SSOP (150 mil body)

• ICS525-01 with output frequencies up to 160 MHz

•

ICS525-02 with output frequencies up to 250 MHz

• User determines the output frequency by

setting all internal dividers

• Eliminates need for custom oscillators

• No software needed

• Online ICS525 calculator at

www.icst.com/products/ics525inputForm.html

• 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 voltages of 3.0 to 5.5V

• Ideal for oscillator replacement

• Industrial temperature versions available

• For Zero Delay, refer to the ICS527

ICS525-01/02

OSCaR™ User Configurable Clock

MDS 525-01/02 I

1

Revision 071100

Printed 11/13/00

Integrated Circuit Systems, Inc. • 525 Race Street •San Jose• CA • 95126•(408) 295-9800tel• www.icst.com

The ICS525-01 and ICS525-02 OSCaR™ are

the most flexible way to generate a high quality,

high accuracy, high frequency clock output from

an inexpensive crystal or clock input. The name

OSCaR stands for OSCillator Replacement, as

they are designed to replace crystal oscillators in

almost any electronic system. The user can easily

configure the device to produce nearly any

output frequency from any input frequency by

grounding or floating the select pins. Neither

microcontroller nor 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 LOCO family

of parts, which are smaller and more cost

effective.

Block Diagram

Description

Features

Crystal or

clock input

X1/ICLK

X2

Reference

Divider

Phase Comparator,

Charge Pump,

and Loop Filter

Crystal

Oscillator

VCO

Divider

VCO

Output

Buffer

2

VDD

GND

S2:S0

CLK

Output

Buffer

REF

Output

Divider

R6:R0

V8:V0

2

3

9

7

PD

optional