September 2006

PCS3P7101A

rev 0.1

Notice: The information in this document is subject to change without notice.

PulseCore Semiconductor Corporation

1715 S. Bascom Ave Suite 200, Campbell, CA 95008

• Tel: 408-879-9077 • Fax: 408-879-9018

www.pulsecoresemi.com

Low Power Peak EMI Reducing clock synthesizer

Features

•

Generates a 4x low EMI clock at the output

•

Input frequency: 25 MHz

•

Integrated loop filter components.

•

Frequency deviation: ±0.25% (Typ) center spread

•

Operates with a 3.3V Supply.

•

Low power CMOS design.

•

Available in 8-pin SOIC package.

•

Pin compatible with ICS 341-22

Block Diagram

Product Description

The PCS3P7101A is a low cost, single-output, clock

synthesizer. The PCS3P7101A generates a 4x output clock

from a 25 MHz standard fundamental mode, inexpensive

crystal, or clock. It can replace multiple crystals and

oscillators, saving valuable board space and cost. The

device employs Spread Spectrum technique to reduce

system electro-magnetic interference (EMI).

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

clock output and turns off the PLL when the PD pin is taken

low.

ModOUT

VSS

XIN/CLKIN

Frequency

Divider

Feedback

Divider

Modulation

Phase

Detector

Loop

Filter

VCO

Output

Divider

PLL

VDD

PD

Crystal

Oscillator

XOUT