Integrated

Circuit

Systems, Inc.

General Description

Features

XTAL OSC

BCLK(0:5)

PCLK(0:3)

OEN

REF(0:2)

48 MHz

SYNC

REG

PLL

CLOCK

GEN

PLL

CLOCK

GEN

X2

X1

FS0

FS1

Block Diagram

Pentium is a trademark of Intel Corporation

PowerPC is a trademark of Motorola Corporation

Frequency Generator and Integrated Buffers for Intel Pentium

µµµµµP's

ICS9169-01

The ICS9169-01 generates all clocks required for high speed

RISC or CISC microprocessor systems such as 486, Pentium/

Pentium Pro™, PowerPC™, etc. Four different reference

frequency multiplying factors are externally selectable with

smooth frequency transitions. These multiplying factors can

be customized for specific applications.Atest mode is provided

to drive all clocks directly.

High drive BCLK outputs typically provide greater than 1V/

ns slew rate into 30pF loads. PCLK outputs typically provide

better than 1V/ns slew rate into 20pF loads while maintaining

50±5% duty cycle. The REF clock outputs typically provide

better than 0.5V/ns slew rates.

•

Generates four processor, six bus, three 14.318 MHz

and one 48 MHz clock for ISA bus, audio, super I/O

and bus bridge devices

•

Supports the Intel MARS chip set

•

Synchronous clocks skew matched to 250ps window on

PCLKs and 500ps window on BCLKs

•

Test clock mode eases system design

•

Selectable multiplying ratios

•

Custom configurations available

•

Output frequency ranges to 100 MHz (depending on

option)

•

3.0V - 5.5 V supply range

•

28-pin SOIC and 28-pin SSOP (209-mil) packages

Applications

•

Ideal for high-speed RISC or CISC systems such as 486,

Pentium, Pentium Pro, PowerPC, etc.

9169-01RevE 08/28/98

ICS reserves the right to make changes in the device data identified in this publication

without further notice. ICS advises its customers to obtain the latest version of all

device data to verify that any information being relied upon by the customer is current

and accurate.