Integrated

Circuit

Systems, Inc.

General Description

Features

ICS9159C-14

Frequency Generator and Integrated Buffer for PENTIUM™

ICS9159C-14RevC062397P

Block Diagram

The ICS9159C-14 generates all clocks required for high

speed RISC or CISC microprocessor systems such as 486,

Pentium, PowerPC,

™ etc. Four different reference frequency

multiply-ing factors are externally selectable with smooth

frequency transitions. These multiplying factors can be

customized for specific applications. It has a TURBO pin

that can speed up the 60 and 66.6 MHz clocks by 2.5%.

High drive BCLK outputs provide typically greater than 1V/

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

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

50±5% duty cycle.

•

Generates up to four processor and six bus clocks,

plus disk, USB and reference clocks

•

Synchronous clocks skew matched to 250ps window

on PCLKs and 500ps window on BCLKs

•

TURBO input pin that can speed up the 60 and

66.6 MHz PCLKs by 2.5%.

•

2.5V or 3.3V output: PCLK (0:3)

•

3.0V - 5.5V supply range

•

28-pin SOIC package

Pentium is a trademark of Intel Corporation.

PowerPC is a trademark of Motorola Corporation.

Pin Cnfiguration

28-Pin SOIC

Functionality

PCLK(0:3)

BCLK(0:5)

USB

DISK

VCO/2

PCLK/2

48 MHz

24 MHz

All frequencies in MHz, assuming 14.318 MHz input.

TURBO

FS1

FS0

X1, REF

(MHz)

PCLK

(MHz)

1

0

0

14.318

50

1

0

1

14.318

66.8

1

1

0

14.318

60

1

1

1

14.318

55

0

0

0

14.318

83.3

0

0

1

14.318

68.4

0

1

0

14.318

61.6

0

1

1

14.318

75

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.