3

Integrated

Circuit

Systems, Inc.

ICS952906A

1236A—08/06/07

ICS952906A is a 48 pin clock chip for VIA VN800/CN700/P4M800 style chipsets. When used with a fanout DDR buffer, such

as the 93788, it provides all the necessary clock signals for such a system.

The ICS952906A 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

PCI_STOP#

CPU_STOP#

VTTPWRGD#/PD#

FS (4:0)

Sel24_48#

MODE

Control

Logic

REF (1:0)

CPUCLKT (1:0)/ITP

CPUCLKC (1:0)/ITP

25MHz (1:0)

3V66 (2:0)

PCICLK (6:0)

PCICLK_F (2:0)

Power Groups

VDD

GND

3

6

REF, Xtal

10, 17

11, 18

PCICLK outputs

24

23

48MHz Fix, Fix Digital, Fix analog

27

28

3V66 outputs

34

37

2.5V for 25MHz outputs

40

43

CPU outputs

48

47

CPU Analog, CPU digital

Description

Pin Number