July 2006

ASM3P4201A

rev 0.2

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

Multi-Output Custom Clock Generator

Features

• Generates five clock outputs from an inexpensive

20MHz crystal or external reference clock.

• Output Frequencies are selectable through select bits

• Generates an EMI optimized clock signal at the output.

• ±1.5% (Typ) Centre Spread for Spread Spectrum Clock

Outputs

• Operates with a 3.3V ± 0.3V Supply Voltage

• Output Clocks disable feature using STBY pin

• Available in 20-pin TSSOP.

Product Description

The ASM3P4201A is a versatile multi output custom

clock generator. The five high frequency Clock outputs

are generated using an inexpensive 20MHz Crystal or

external reference clock. The accuracy of the 20MHz

Input Clock should be within ±50ppm. The output clocks

consist of a low EMI spread spectrum clock and other

non-spread clocks. Three Select bits choose the

combination of Output Clock Frequency. Refer to the

Output Frequency Selection Table for the values. Output

clocks can be disabled using the STBY pin. The device

operates from a Supply Voltage of 3.3V±0.3V with a

tolerable ripple voltage of 50mV . The device is available

in a 20 pin TSSOP JEDEC package.

Block Diagram

CLK6

CLK1

CLK5

CLK4

CLK3

CLK2

Crystal

Oscillator

XIN

XOUT

VDD

GND

STBY

S0 S1 S2

PLL