Integrated

Circuit

Systems, Inc.

ICS9250-25

Third party brands and names are the property of their respective owners.

Block Diagram

9250-25 Rev A 10/03/00

Pin Configuration

Recommended Application:

810/810E and Solano type chipset

Output Features:

•

2 - CPUs @ 2.5V, up to 153.33MHz.

•

13 - SDRAM @ 3.3V, up to 153.33MHz.

•

3 - 3V66 @ 3.3V, 2x PCI MHz.

•

8 - PCI @3.3V.

•

1 - 48MHz, @3.3V fixed.

•

1 - 24MHz @ 3.3V

•

1 - REF @3.3V, 14.318MHz.

Features:

•

Up to 153.33MHz frequency support

•

Support power management through PD#.

•

Spread spectrum for EMI control (± 0.25%)

center spread.

•

Uses external 14.318MHz crystal

•

FS pins for frequency select

Key Specifications:

•

CPU Output Jitter: <250ps

•

IOAPIC Output Jitter: <500ps

•

48MHz, 3V66, PCI Output Jitter: <500ps

•

Ref Output Jitter. <1000ps

•

CPU Output Skew: <175ps

•

PCI Output Skew: <500ps

•

3V66 Output Skew <175ps

•

For group skew timing, please refer to the

Group Timing Relationship Table.

Frequency Generator & Integrated Buffers for Celeron & PII/III™

56-Pin 300 mil SSOP

1. These pins will have 1.5 to 2X drive strength.

* 120K ohm pull-up to VDD on indicated inputs.

SDATA

SCLK

PLL2

PLL1

Spread

Spectrum

48MHz

24MHz

CPUCLK [1:0]

2

12

8

3

SDRAM [11:0]

IOAPIC

PCICLK [7:0]

SDRAM_F

3V66 [2:0]

X1

X2

XTAL

OSC

CPU

DIVDER

SDRAM

DIVDER

IOAPIC

DIVDER

PCI

DIVDER

3V66

DIVDER

FS[4:0]

PD#

Control

Logic

Config.

Reg.

/ 2

REF0

VDDREF

X1

X2

GNDREF

GND3V66

3V66-1

3V66-2

VDD3V66

VDDPCI

*FS0/PCICLK0

*FS1/PCICLK1

PCICLK2

GNDPCI

PCICLK3

PCICLK4

PCICLK5

VDDPCI

PCICLK6

PCICLK7

GNDPCI

PD#

SCLK

SDATA

VDDSDR

SDRAM11

SDRAM10

GNDSDR

3V66-0

1

1

REF0/FS4*

VDDLAPIC

IOAPIC

VDDLCPU

CPUCLK0

CPUCLK1

GNDLCPU

GNDSDR

SDRAM0

SDRAM1

SDRAM2

VDDSDR

SDRAM3

SDRAM4

SDRAM5

GNDSDR

SDRAM6

SDRAM7

SDRAM_F

VDDSDR

GND48

24MHz/FS2*

48MHz/FS3*

VDD48

VDDSDR

SDRAM8

SDRAM9

GNDSDR

1

1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

56

55

54

53

52

51

50

49

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

Preliminary Product Preview

PRODUCT PREVIEW documents contain information on new products

in the sampling or preproduction phase of development. Characteristic

data and other specifications are subject to change without notice.