August 2007

ASM3P2855B

rev 0.3

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

Custom Clock Generator for Fax System

Features

•

Generates Custom Clocks for FAX system from

an inexpensive 24MHz Crystal

•

7 x 50MHz synchronized non-Spread Spectrum

clocks (for CPU, ASIC2, ASIC3, HDD, and PCI

Analyzer, Ethernet, and LAN PHY)

•

1 x 50MHz for CPU Timer

•

1x 19.52MHz non-spread clock for Scanner

•

REFOUT Clock

•

Supply Voltage 3.3 V +/- 0.3V

•

Available in 16L TSSOP, Green package

•

Commercial Temperature operation

Product Description

ASM3P2855B is a part of the two chip custom clock

generator solution for NEC FAX system. Together with

ASM3P2854A, ASM3P2855B realizes all the eighteen

clocks required by the various components and

subsystems of the FAX system. It uses an inexpensive

24MHz crystal as the input to generate five synchronized

50MHz non-spread PCI clocks used by CPU, HDD, PCI

Analyzer,

ASIC2

and

ASIC3,

two

non-spread

synchronized 50MHz clocks for Ethernet and LAN PHY, a

50MHz clock for the CPU Timer, and a 19.52MHz non-

spread clock used by ASIC1 for Scanner. The custom

clock generator ASM3P2855B works with a Supply

Voltage of 3.3V. The device is available in a 16L TSSOP

Green package and in commercial temperature range.

Block Diagram

7

50MHz

Crystal

Oscillator

XIN / CLKIN

XOUT

19.52MHz

PLL

VDD

VDD_FOUT

GND

GND_FOUT

50MHZ

REFOUT