Integrated

Circuit

Systems, Inc.

ICS9248-97

Block Diagram

Frequency Timing Generator for PENTIUM II Systems

9248-97 Rev E 08/18/00

Pin Configuration

48-pin SSOP

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

RecommendedApplication:

Camino chipset

OutputFeatures:

•

3 - CPUs @ 2.5V, up to 180MHz.

•

3-IOAPIC@2.5V,PCI/2

•

3-3V66MHz@3.3V.

•

11 - PCIs @ 3.3V

•

1-48MHz,@3.3Vfixed

•

1-24/48MHz,@3.3V

•

1-CPU/2,@2.5V.

Features:

•

Up to 180MHz frequency support

•

Support power management: Power down Mode

•

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

•

CPU/2 Output Jitter. <250ps

•

IOAPIC Output Jitter: <500ps

•

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

•

Ref Output Jitter. <1000ps

•

CPU Output Skew: <175ps

•

IOAPIC Output Skew <250ps

•

3V66 Output Skew <250ps

•

CPU to 3V66 Output Offset: 0.0 - 1.5ns (CPU leads)

•

3V66 to PCI Output Offset: 1.5 - 4.0ns (3V66 leads)

•

CPU to IOAPIC Output Offset 1.5 - 4.0ns (CPU leads)

SEL24_48#

SDATA

SCLK

FS (4:0)

PD#

PLL2

PLL1

Spread

Spectrum

48MHz

24_48MHz

CPUCLK (2:0)

IOAPIC (2:0)

PCICLK (9:0)

CPU/2

PCICLK_F

3V66 (2:0)

X1

X2

XTAL

OSC

CPU

DIVDER

IOAPIC

DIVDER

PCI

DIVDER

3V66

DIVDER

Control

Logic

Config.

Reg.

/ 2

/ 2

REF (1:0)

GNDREF

REF0

*SEL24_48#/REF1

VDDREF

X1

X2

GNDPCI

*FS0/PCICLK_F

*FS1/PCICLK0

VDDPCI

*FS2/PCICLK1

*FS3/PCICLK2

GNDPCI

PCICLK3

PCICLK4

VDDPCI

PCICLK5

PCICLK6

GNDPCI

PCICLK7

PCICLK8

PCICLK9

VDDPCI

PD#

VDDLAPIC

IOAPIC0

IOAPIC1

GNDLAPIC

IOAPIC2

VDDLCPU/2

CPU/2

GNDLCPU/2

CPUCLK0

VDDLCPU

CPUCLK1

CPUCLK2

GNDLCPU

VDD66

3V66_0

3V66_1

3V66_2

GND66

SDATA

SCLK

VDD48

48MHz/FS4*

24_48MHz

GND48

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

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.