9134-06 9134-07 RevC111695

Integrated

Circuit

Systems, Inc.

ICS9134-06

ICS9134-07

Advance Information

32 kHz Motherboard Frequency Generator

Block Diagram

VDD32

14.318 MHz

Peripheral

Clocks

CPUCLK

32.768 kHz

32.768 kHz

crystal

Reference

Clock

Clock

Generator

1

Clock

Generator

2

Clock

Generator

3

General Description

The ICS9134-06 and ICS9134-07 are designed to generate

clocks for all 286, 386, 486, Pentium and RISC-based mother-

boards, including laptops and notebook computers. The only

external components required are a 32.768 kHz crystal and

decoupling capacitors. The device generates the 14.318 MHz

system clock, eliminating the need for a 14.318 MHz crystal.

High performance applications may require high speed clock

termination components. The chip includes three independent

clock generators plus the 32.768 kHz reference clock to pro-

duce all necessary frequencies, including real time

clock/DRAM refresh, master clock, CPU clock, keyboard

clock, floppy disk controller clock, serial communications

clock and bus clocks. Different frequencies from clocks #2 can

be selected using the frequency select pins, but clock #1 will

be at 14.318 MHz for all standard versions.

VDD32 Supply

The ICS9134-06 and ICS9134-07 have a separate power sup-

ply for the 32.768 kHz oscillator circuitry. This allows the

32 kHz clock to run from a battery or other source while the

main power to the chip is disconnected. The VDD32 supply is

guaranteed to operate down to +2.0V, with the clock consuming

less than 10

µA at +3.3V with the main VDD at 0V.

The frequencies and power-down options in the ICS9134-06

and ICS9134-07 are mask programmable. Customer specific

masks can be made and prototypes delivered within 6-8 weeks

from receipt of order. Integrated Circuit Systems also offers

standard versions, such as that described in this data sheet.

Applications

Notebook/Palmtop Computers: The ICS9134-06

and

ICS9134-07 work with +3.3V and +5V and a single

32.768 kHz crystal, making it the ideal solution for generating

clocks in portables with minimum board space. The user can

save power by using this single part instead of oscillators or

other frequency generators. The ICS9134-06 and ICS9134-07

further reduce the current consumption by having the ability to

completely shut down the individual clocks when not in use, while

still maintaining the separately powered 32.768 kHz clock.

Features

•• Single 32.768 kHz crystal generates all PC motherboard

clocks

•• 3 independent clock generators

•• Generates CPU clocks from 4.0 to 80 MHz

•• Up to 5 output clocks

•• Separate VDD for 32 kHz clock

•• Power-down options available

•• Operates from 3.3V or 5.0V supply

•• Operates up to 66 MHz at 3.3V

•• Supports OPTi 80C463/5 and Fir™

™ chipsets

•• 16-pin, 300-mil, SOIC package

Fir is a trademark of Picopower Corporation.