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ICS513

LOCO鈩?PLL Clock Generator

Description

The ICS513 LOCO鈩?is the most cost effective

way to generate a high quality, high frequency

clock output from a 14.31818 MHz crystal or

clock input. The name LOCO stands for LOw

Cost Oscillator, as it is designed to replace crystal

oscillators in many electronic systems. Using

Phase-Locked-Loop (PLL) techniques, the device

uses a standard, inexpensive crystal to produce

output clocks up to 100 MHz.

Stored in the chip鈥檚 ROM is the ability to generate

5 different output frequencies, allowing one chip

to work in different speed processor systems.

The device also has a power down mode that turns

off the clock outputs when both select pins are low.

In this mode, the internal PLL is not running.

Features

鈥?Packaged as 8 pin SOIC

鈥?ICS鈥?lowest cost PLL clock plus reference

鈥?Produces common computer frequencies

鈥?Input crystal frequency typically 14.3182 MHz

鈥?Output clock frequencies up to 100 MHz

鈥?Low jitter - 40 ps one sigma

鈥?Compatible with all popular CPUs

鈥?Duty cycle of 45/55

鈥?Custom frequencies available

鈥?Operating voltages of 3.0 to 5.5 V

鈥?Power down mode turns off chip

鈥?25mA drive capability at TTL levels

鈥?Advanced, low power CMOS process

Block Diagram

VDD GND

2

S1, S0

PLL

Clock

Synthesis

and Control

Circuitry

Output

Buffer

CLK

14.31818 MHz

crystal

or clock

X1/ICLK

Crystal

Oscillator

X2

Output

Buffer

REF

Optional crystal capacitors

1

Revision 080699

Printed 12/4/00

Integrated Circuit Systems 鈥?525 Race Street 鈥?San Jose 鈥?CA鈥?95126 鈥?(408)295-9800tel鈥?(408)295-9818fax

MDS 513 B

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