ICS2694M Integrated Circuit System, ICS2694M Datasheet

ICS2694M

Manufacturer Part Number

ICS2694M

Description

Motherboard Clock Generator

Manufacturer

Integrated Circuit System

Datasheets

1.ICS2694.pdf (8 pages)

2.ICS2694M.pdf (8 pages)

Available stocks

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Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

ICS2694M

Manufacturer:

ICS

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

ICS2694M-007T

Manufacturer:

ICS

Quantity:

2 388

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Motherboard Clock Generator

Description

The ICS2694 Motherboard Clock Generator is an integrated

circuit using PLL and VCO technology to generate virtually all

the clock signals required in a PC. The use of the device can be

generalized to satisfy the timing needs of most digital systems

by reprogramming the VCO or reconfiguring the counter stages

which derive the output frequencies from the VCO’s.

The primary VCO is customarily used to generate the CPU

clock and is so labeled on the ICS2694. Pre-programmed

frequency sets are listed on page 6. These choices were made

to match the major microprocessor families. CPUSEL (0-3)

allow the user to select the appropriate frequency for the

application.

Due to the filter in the phase-locked loop, the CPUCLK will

move in a linear fashion from one frequency to a newly-

selected frequency without glitches. If a fixed CPUCLK value

is desired, CPUSEL (0-3) may be hard wired to the desired

address with STROBE tied high. (It has a pull-up.) For board

test and debug, pulling OUTPUTE to Ground will tristate all

the outputs.

Applications

ICS2694RevA1094

CPU clock and Co-processor clock

Hard Disk and Floppy Disk clock

Keyboard clock

Serial Port clock

Bus clock

System counting or timing functions

Integrated

Circuit

Systems, Inc.

Features

Pin Configuration

CPUSEL0

CPUSEL1

CPUSEL2

CPUSEL3

STROBE

CPUCLK

Low cost - eliminates multiple oscillators and Count

Down Logic

Primary VCO has 16 Mask Programmable frequencies

(normally CPU clock)

Secondary VCO has 1 Mask Programmable frequency

(usually 96 MHz)

Pre-programmed versions for typical PC applications

10 Outputs in addition to the primary CPU clock

Capability to reconfigure counter stages to change the

frequencies of the outputs via mask options

Advanced PLL design

On-chip PLL filters

Very Flexible Architecture

DVDD

OUT2

OUT1

OUT0

OUT9

VSS

24-Pin DIP or SOIC

OUT3

OUT4

OUT5

OUT6

OUT7

OUT8

AVDD

XTAL2

XTAL1

AVSS

OUTPUTE

CLKIN

ICS2694

(CPUCLK/2)

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