4

Integrated

Circuit

Systems, Inc.

ICS951411

0891E—03/07/05

ICS951411 provides a single-chip clocking solution for the ATI RS400-based systems using the latest Intel P4 processors.

ICS951411 is driven with a 14.318MHz crystal. It generates CPU outputs up to 400MHz and also provides highly accurate

SRC clocks for PCI Express support. Two Clock Request pins are provided for Express-Card

General Description

Block Diagram

Power Groups

MAIN PLL

PCICLK0

CONTROL

LOGIC

XTAL

OSC.

CPUCLK(2:0)

FIXED PLL

USB_48MHz

DIVIDER

DIVIDERS

REF(2:0)

SRCCLK(7:3,0)

CLKREQA#

SDATA

SCLK

CLKREQB#

X1

X2

IREF

FS(C:A)

CPU_STOP#

VTT_PWRGD#/PD

ATIGCLK(1:0)

CK410#

VDD

GND

56

55

Xtal, REF

51

49

PCICLK output

45

44

CPUCLK Outputs

14, 21, 35 15, 20, 26, 36

SRCCLK outputs

32

31

ATIGCLK outputs

39

38

Analog, CPU PLL

3

5

USB_48MHz output

Pin Number

Description