2

Integrated

Circuit

Systems, Inc.

ICS950219

Preliminary Product Preview

0640D—12/30/03

The ICS950219 is a single chip clock solution for desktop designs using the Intel 845 chipset with PC133 or DDR memory. It

provides all necessary clock signals for such a system.

The ICS950219 is part of a whole new line of ICS clock generators and buffers called TCH™ (Timing Control Hub). ICS is the first

to introduce a whole product line which offers full programmability and flexibility on a single clock device.This part incorporates ICS's

newest clock technology which offers more robust features and functionality. Employing the use of a serially programmable I

2C

interface, this device can adjust the output clocks by configuring the frequency setting, the output divider ratios, selecting the ideal

spread percentage, the output skew, the output strength, and enabling/disabling each individual output clock.TCH also incorporates

ICS's Watchdog Timer technology and a reset feature to provide a safe setting under unstable system conditions. M/N control can

configure output frequency with resolution up to 0.1MHz increment.With all these programmable features ICS's, TCH makes mother

board testing, tuning and improvement very simple.

General Description

AVDD

GND

2

47

REF output, Crystal

24

21

48MHz fixed, Fixed PLL

39

43

CPU Outputs, CPU PLL, CPU Master

Clock,

VDD

GND

--

9, 18

5, 13

PCI outputs

32

29

3V66 outputs

46

36

CPU Outputs, IREF, MULTSEL

Pin Number

Description

Power Groups

Block Diagram

PLL2

PLL1

Spread

Spectrum

PCICLK (9:0)

3V66 (3:0)

X1

X2

XTAL

OSC

CPU

DIVDER

PCI

DIVDER

3V66

DIVDER

PD#

MULTSEL(1:0)

SDATA

SCLK

Vtt_PWRGD#

FS (4:0)

I REF

RESET#

Control

Logic

Config.

Reg.

REF (1:0)

3

10

4

3

CPUCLKT (2:0)

CPUCLKC (2:0)

48MHz

24_48MHz

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