Integrated

Circuit

Systems, Inc.

General Description

Features

ICS9159-12

Frequency Generator and Buffers for Mobile Pentium™ Systems

9159-12RevB071797

Block Diagram

The ICS9159-12 generates all clocks required for mobile

microprocessor systems based on Pentium/Mobile Triton

chip sets. Three different reference frequency multiplying

factors are externally selectable with smooth frequency

transitions. These multiplying factors can be customized

for specific plications. A test mode is provided to drive all

clocks directly.

High drive BCLK outputs provide greater than 1V/ns slew

rate into 30pF loads. PCLK outputs provide better than 1V/

ns slew rate into 20pF loads while maintaining ±5% duty

cycle.

•

Generates 14 clocks including processor, disk

and reference

•

Meets all Pentium/Mobile Triton 82430MX

requirments

•

Independent buffers provide 4 and 6 clock copies

•

Buffered clocks skew matched to ±250ps

•

Buffer inputs are 5V tolerant

•

Test clock mode eases system design

•

Selectable multiplying and processor/bus ratios

•

Custom configurations available

•

3.0V- 5.5V supply range

•

28pin, .209" SSOP package

Pentium is a trademark of Intel Corporation.

FS1

FS0

*VCO

X1, REF

(MHz)

CPU (MHz)

0

0

118/17*X1

14.318

50 (49.69)

0

1

65/7*X1

14.318

66.6 (66.47)

1

0

92/11*X1

14.318

60 (59.87)

1

1

Test mode

TCLK

TCLK/2

CPU

24M

VCO/2

24 MHz

TCLK/2

TCLK/4

Functionality

*VCO range is limited form 60 - 200 MHz.

Pin Configuration

28-Pin SSOP

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.