Integrated

Circuit

Systems, Inc.

General Description

Features

ICS9248- 101

Block Diagram

Pentium is a trademark of Intel Corporation

I

9248-101 Rev C 2/29/00

Pin Configuration

•

Up to 137MHz frequency support

•

Spread Spectrum for EMI control

•

Frequency Select, Spread Spectrum.

•

Provides the following system clocks

- 4-CPUs @ 2.5/3.3V, up to 137MHz.

(including CPUCLK_F)

- 9-SDRAMs @3.3V, up to 137MHz

(including SDRAM_F)

- 8-PCI @3.3V,CPU/2orCPU/3

(including 1 free running PCICLK_F)

- 1-24/48MHz@3.3V

-1-48MHz@3.3Vfixed

- 2-REF@3.3V,14.318MHz.

•

Efficient Power management scheme through PCI

andSTOPCLOCKS

•

Spread Spectrum ± .25%, & 0 to -0.5% down spread

48-Pin SSOP and TSSOP

Power Groups

VDDLCPU,GNDLCPU=CPUCLK[2:0],CPUCLK_F

VDDSDR,GNDSDR=SDRAMCLKS[7:0],SDRAM_F

VDDPCI,GNDPCI=PCICLKS[6:0],PCICLK_F

VDD48,GND48=48MHz,24MHz

VDDREF,GNDREF=REF,X1,X2

VDDCOR=PLLCORE

* Internal Pull-up Resistor of 120K to VDD

The ICS9248-101 is the single chip clock solution for

Notebook designs using the 440BX or the VIAApollo Pro 133

style chipset. It provides all necessary clock signals for such a

system.

Spread spectrum typically reduces system EMI by 8dB to

10dB. This simplifies EMI qualification without resorting to

board design iterations or costly shielding. The ICS9248-101

employs a proprietary closed loop design, which tightly

controls the percentage of spreading over process and

temperature variations.

VDDREF

REF0

GNDREF

X1

X2

VDDPCI

*CPU2.5_3.3#/PCICLK_F

*FS3/PCICLK0

GNDPCI

*SEL24_48#/PCICLK1

PCICLK2

PCICLK3

PCICLK4

VDDPCI

BUFFER IN

GNDPCI

PCICLK5

PCICLK6

VDDCOR

PCI_STOP#

*PD#

GND48

SDATA

SCLK

REF1/FS2*

VDDLCPU

CPUCLK_F

CPUCLK0

GNDLCPU

CPUCLK1

CPUCLK2

CLK_STOP#

GNDSDR

SDRAM_F

SDRAM0

SDRAM1

VDDSDR

SDRAM2

SDRAM3

GNDSDR

SDRAM4

SDRAM5

VDDSDR

SDRAM6

SDRAM7

VDD48

48MHz/FS0*

24_48MHz/FS1*

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

{

I C

2

ICS reserves the right to make changes in the device data identified in

this publication without further notice. ICS advises its customers to

obtain the latest version of all device data to verify that any

information being relied upon by the customer is current and accurate.