ICS251PM datasheet(1/10 Pages) IDT

Part #	ICS251PM

Description	FIELD PROGRAMMABLE SS VERSACLOCK SYNTHESIZER

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DATASHEET

FIELD PROGRAMMABLE SS VERSACLOCK SYNTHESIZER

ICS251

IDT™ / ICS™ FIELD PROGRAMMABLE SS VERSACLOCK SYNTHESIZER 1

ICS251

REV B 061306

Description

The ICS251 is a low cost, single-output, field programmable

clock synthesizer. The ICS251 can generate an output

frequency from 314 kHz to 200 MHz and may employ

Spread Spectrum techniques to reduce system

electro-magnetic interference (EMI).

Using ICS’ VersaClock™software to configure the PLL and

output, the ICS251 contains a One-Time Programmable

(OTP) ROM to allow field programmability. Programming

features include 4 selectable configuration registers.

The device employs Phase-Locked Loop (PLL) techniques

to run from a standard fundamental mode, inexpensive

crystal, or clock. It can replace multiple crystals and

oscillators, saving board space and cost.

The device also has a power-down feature that tri-states the

clock outputs and turns off the PLLs when the PDTS pin is

taken low.

The ICS251 is also available in factory programmed custom

versions for high-volume applications.

Features

• 8-pin SOIC package

• Four addressable registers

• Input crystal frequency of 5 to 27 MHz

• Clock input frequency of 3 to 150 MHz

• Output clock frequencies up to 200 MHz

• Configurable Spread Spectrum Modulation

• Operating voltage of 3.3 V

• Replaces multiple crystals and oscillators

• Controllable output drive levels

• Advanced, low-power CMOS process

• Available in RoHS compliant packaging

Block Diagram

Crystal

Oscillator

PLL Clock Synthesis,

Spred Spectrum and

Control Circuitry

CLK

PDTS (output and PLL)

OTP ROM

with PLL

Divider

Values

S1:0

2

VDD

GND

X2

Crystal or

clock input

External capacitors are

required with a crystal input.

X1/ICLK

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