ICS341

MDS 341 E

1

Revision 090704

Integrated Circuit Systems, Inc.

Field Programmable SS VersaClock Synthesizer

Description

The ICS341 is a low cost, single-output, field

programmable clock synthesizer. The ICS341 can

generate an output frequency from 250 kHz to 200

MHz and may employ Spread Spectrum techniques to

reduce system electro-magnetic interference (EMI).

and output, the ICS341 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 ICS341 is also available in factory programmed

custom versions for high-volume applications.

Features

selection

output clocks, see the ICS343. For more than three

outputs, see the ICS345 or ICS348.

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