DATASHEET

FIELD PROGRAMMABLE DUAL OUTPUT SS VERSACLOCK SYNTHESIZER

I CS3 4 2

IDT® / ICS™ FIELD PROGRAMMABLE DUAL OUTPUT SS VERSACLOCK SYNTHESIZER 1

ICS342

REV N 090613

Description

The ICS342 is a low cost, dual-output, field programmable

clock synthesizer. The ICS342 can generate two output

frequencies from 250 kHz to 200 MHz, using up to two

independently configurable PLLs. The outputs may employ

Spread Spectrum techniques to reduce system

electro-magnetic interference (EMI).

and output, the ICS342 contains a One-Time

Programmable (OTP) ROM to allow field programmability.

Programming features include 2 selectable configuration

registers. Using Phase-Locked Loop (PLL) techniques, the

device runs 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 ICS342 is also available in factory programmed custom

versions for high-volume applications.

Features

clocks, see the ICS343. For more than three outputs, see

the ICS345 or ICS348.

Block Diagram

Crystal

Oscillator

PDTS (both outputs and PLL)

OTP ROM

with PLL

Divider

Values

SEL

VDD

GND

CLK1

CLK2

PLL Clock Synthesis,

Spred Spectrum and

Control Circuitry

X2

Crystal or

clock input

External capacitors are

required with a crystal input.

X1/ICLK