ICS18051 datasheet(1/6 Pages) ICST

Part #	ICS18051

Description	Low EMI Clock Generator

PDF	6 Pages

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Manufacturer	ICST [Integrated Circuit Systems]

Direct Link	http://www.icst.com

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ICS180-51

Low EMI Clock Generator

MDS 180-51 A

1

Revision 110404

Integrated Circ uit Systems l5 25 Race Street, San Jo se, CA 9 512 6 l tel (408 ) 29 7-120 1 l

www.ics t.co m

Description

The ICS180-51 generates a low EMI output clock from

a clock or crystal input. The device uses ICS’

proprietary mix of analog and digital Phase-Locked

Loop (PLL) technology to spread the frequency

spectrum of the output, thereby reducing the frequency

amplitude peaks by several dB.

The ICS180-51 offers center spread selection of

+/-0.625% and +/-1.875%. Refer to the MK1714-01/02

for the widest selection of input frequencies and

multipliers.

ICS offers a complete line of EMI reducing clock

generators. Consult us when you need to remove

crystals and oscillators from your board.

Features

• Pin and function compatible to Cypress W180-51

• Packaged in 8-pin SOIC

• Provides a spread spectrum output clock

• Accepts a clock input and provides same frequency

dithered output

• Input frequency of 8 to 28 MHz

• Peak reduction by 7dB - 14dB typical on 3rd - 19th

odd harmonics

• Spread percentage selection for +/-0.625% and

+/-1.875%

• Operating voltage of 3.3 V and 5 V

• Advanced, low-power CMOS process

Block Diagram

PLL Clock

Synthesis

and Spread

Spectrum

Circuitry

SS%

CLK

GND

VDD

FS2:1

X1/CLKIN

X2

Clock Buffer/

Crystal

Oscillator

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