ICS181-53 datasheet(1/6 Pages) ICST

Part #	ICS181-53

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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ICS181-53

Low EMI Clock Generator

MDS 181-53 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 ICS181-53 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 ICS181-53 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 W181-53

• Packaged in 8-pin SOIC

• Provides a spread spectrum output clock

• Accepts a clock input and provides same frequency

dithered output

• Input frequency of 46 to 75 MHz for Clock input

• 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

SSON#

CLKIN

Clock Buffer

FS1

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