ICS501B

MDS 501B C

1

Revision 120704

Description

generate a high-quality clock output from a lower

frequency crystal or clock input. The name LOCO

stands for Low Cost Oscillator, as it is designed to

replace crystal oscillators in most electronic systems.

Using Phase-Locked Loop (PLL) techniques, the

device uses a standard fundamental mode,

inexpensive crystal to produce output clocks up to 20

MHz.

Stored in the chip’s ROM is the ability to generate nine

different multiplication factors, allowing one chip to

output many common frequencies (see table on page

2).

The device also has an output enable pin which

tri-states the clock output when the OE pin is taken low.

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 or guaranteed.

For applications which require defined input to output

skew, use the ICS570B.

Features

Block Diagram

CLK

PLL Clock

M ultiplier

Circuitry

and ROM

Crystal or

Clock input

GND

OE

VDD

Crystal

O scillator

S1:0

X1/ICLK

X2

O ptional crystal capacitors

2