2

Integrated

Circuit

Systems, Inc.

ICS950703

0690D—05/14/04

Power Groups

The ICS950703 is a single chip clock solution for desktop designs using the Intel Brookdale chipset with Rambus RDRAM

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

The ICS950703 is part of a whole new line of ICS clock generators and buffers called TCH™ (Timing Control Hub). This part

incorporates ICS's newest clock technology which offers more robust features and functionality. Employing the use of a serially

programmable I

selecting the ideal spread percentage, the output skew, the output strength, and enabling/disabling each individual output clock. M/

N control can configure output frequency with resolution up to 0.1MHz increment.This part also provides 128 frequency selections

via ICS QuadROM

General Description

Block Diagram

PLL2

Frequency

Dividers

Programmable

Spread

PLL1

Programmable

Frequency

Dividers

STOP

Logic

X1

X2

XTAL

MULTSEL (1:0)

FS (3:0)

SDATA

SCLK

PD#

SEL100_133#

Control

Logic

48MHZ (1:0)

REF (1:0)

PCICLK (9 :0)

3V66 (3:0)

MREF_B

MREF

I REF

4

CPUCLKC (3:0)

AVDD

GND

4

7

REF output, Crystal

27

24

48MHz fixed, Fixed PLL

38

37

CPU PLL, CPU Master Clock,

VDD

GND

--

10, 16, 22

13, 19

PCI outputs

29, 36

32, 33

3V66 outputs

43, 49

40, 46

CPU Outputs, IREF, MULTSEL

56

53

MREF outputs

Pin Number

Description