DATASHEET

FIELD PROGRAMMABLE TRIPLE OUTPUT SS VERSACLOCK SYNTHESIZER

I CS3 4 3

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

ICS343

REV M 090613

Description

The ICS343 is a low cost, triple-output, field programmable

clock synthesizer. The ICS343 can generate three output

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

independently configurable PLLs. The outputs may employ

Spread Spectrum techniques to reduce system

electro-magnetic interference (EMI).

Using IDT’s VersaClock™ software to configure the PLL

and output, the ICS343 contains a One-Time

Programmable (OTP) ROM to allow field programmability.

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 ICS343 is also available in factory-programmed

custom versions for high-volume applications.

Features

CMOS process

clocks, see the ICS342. 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

VDD

GND

CLK1

CLK3

CLK2

PLL Clock Synthesis,

Spred Spectrum and

Control Circuitry

X2

Crystal or

clock input

External capacitors are

required with a crystal input.

X1/ICLK