2

Integrated

Circuit

Systems, Inc.

ICS950218

0466B—03/17/04

The ICS950218 is a single chip clock solution for desktop designs using the Intel Brookdale chipset with PC133 or DDR

memory. It provides all necessary clock signals for such a system.

The ICS950218 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

Block Diagram

PLL2

PLL1

Spread

Spectrum

48MHz

PCICLK (9:0)

3V66 (2:0)

24_48MHz

X1

X2

XTAL

OSC

CPU

DIVDER

PCI

DIVDER

3V66

DIVDER

PD#

MULTSEL(1:0)

SDATA

SCLK

Vtt_PWRGD#

SEL 48_24#

SEL 66_48#

FS (4:0)

I REF

RESET#

Control

Logic

Config.

Reg.

REF (1:0)

3

10

4

3

CPUCLKT (2:0)

CPUCLKC (2:0)

/ 2

3V66

DIVDER

3V66_48MHz