ICS7151 datasheet(1/8 Pages) ICST

部品番号	ICS7151

部品情報	Spread Spectrum Clock Generator

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メーカー	ICST [Integrated Circuit Systems]

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ICS7151

MDS 7151 E

1

Revision 012306

Integrated Circuit Systems, Inc.

● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

Spread Spectrum Clock Generator

Description

The ICS7151-10, -20, -40, and -50 are clock

generators for EMI (Electro Magnetic Interference)

reduction (see below for frequency ranges and

multiplier ratios). Spectral peaks can be attenuated by

slightly modulating the oscillation frequency. Both down

and center spread profiles are selectable. Down spread

maintains an average frequency less than an unspread

clock, and will not exceed the maximum frequency of

an unspread clock.

Features

• Operating voltage of 3.3 V ±0.3 V

• Packaged in 8-pin SOIC

• Available in Pb (lead) free package

• Input frequency range of 16.5 to 33.4 MHz

• Output frequency ranges of 8.3 to 16.7 MHz, 16.5 to

33.4 MHz, 33.3 to 66.7 MHz, 66.6 to 133.4 MHz

• Provides a spread spectrum clock output (±0.5%,

±1.5% center spread; -1.0%, -3.0% down spread)

• Multiplication rates of x1/2, x1, x2, and x4

• Advanced, low-power CMOS process

Block Diagram

Product Lineup

Product

Input Frequency Range

Multiplier Ratio

Output Frequency Range

ICS7151M-10, ICS7151MI-10

16.5 MHz to 33.4 MHz

X1

16.5 MHz to 33.4 MHz

ICS7151M-20, ICS7151MI-20

16.5 MHz to 33.4 MHz

X2

33.3 MHz to 66.7 MHz

ICS7151M-40, ICS7151MI-40

16.5 MHz to 33.4 MHz

X4

66.6 MHz to 133.4 MHz

ICS7151M-50, ICS7151MI-50

16.5 MHz to 33.4 MHz

X1/2

8.3 MHz to 16.7 MHz

PLL Clock

Synthesis

and Spread

Spectrum

Circuitry

S1:0

ENS

CKOUT

2

GND

VDD

Clock Buffer/

Crystal

Ocsillator

XIN

XOUT

External caps required with crystal for

accurate tuning of the clock

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