4

Integrated

Circuit

Systems, Inc.

ICS953002

0924—11/18/09

ICS953002 is a 56-pin clock chip for P4 type processors with PCI-Express.

The ICS953002 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

divider ratios, 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.

General Description

Block Diagram

I REF

RESET#

PLL2

Frequency

Dividers

Programmable

Spread

PLL1

Programmable

Frequency

Dividers

STOP

Logic

48MHz

24_48MHz

X1

X2

XTAL

SDATA

SCLK

VTTPWRGD#

PD#

Turbo#

FS (4:0)

Sel24_48#

MODE0

Control

Logic

REF (1:0)

CPUCLKT (1:0)

CPUCLKC (1:0)

CPUCLKT2_ITP/PCIEXT0

CPUCLKC2_ITP/PCIEXC0

3V66 (2:0)

PCICLK (5:0)

PCI-EXT (5:1)

PCI-EXC (5:1)