Integrated

Circuit

Systems, Inc.

ICS9248- 131

Block Diagram

Pentium is a trademark of Intel Corporation

I

9248-131 Rev B 7/17/00

Pin Configuration

48-Pin SSOP

* Internal Pull-up Resistor of

240K to 3.3V on indicated inputs

VDDF

*REF0/CPU2.5_3.3#

GND

X1

X2

VDDPCI

*PCICLK_F/FS1

*PCICLK0/FS2

GND

PCICLK1

PCICLK2

PCICLK3

PCICLK4

VDDA

BUFFERIN

GND

*CPU_STOP#/SDRAM11

*PCI_STOP#/SDRAM10

VDDSDR

*AGP_STOP#/SDRAM9

*PD#/SDRAM8

GND

SDATA

SCLK

VDDAGP

AGP0

AGP1

GND

CPUCLK0

CPUCLK1

VDDL

CPUCLK2

SDRAM0

SDRAM1

VDDSDR

SDRAM2

SDRAM3

GND

SDRAM4

SDRAM5

VDDSDR

SDRAM6

SDRAM7

GND

48MHz/FS0*

AGP_F/MODE*

SDRAM12

GND

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

RecommendedApplication:

OutputFeatures:

•

3 - CPUs @ 2.5/3.3V, up to 100MHz.

•

3-AGPCLK@3.3V

•

13 - SDRAM @ 3.3V

•

6 - PCI @ 3.3V

•

1-48MHz,@3.3Vfixed.

•

1-REF@3.3V,14.318MHz.

Features:

•

Support power management: CPU, PCI, AGP stop and

•

Spread spectrum for EMI control.

•

Uses external 14.318MHz crystal

•

FS pins for frequency select

Key Specifications:

•

CPU – CPU: <250ps

•

AGP – PCI: <550ps

•

CPU(early)-PCI: 1-4ns, Center 2-6ns

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

CPU2.5_3.3#

PLL2

PLL1

Spread

Spectrum

48MHz

CPUCLK (2:0)

PCICLK (4:0)

AGP (1:0)

2

5

3

AGP_F

PCICLK_F

X1

X2

XTAL

OSC

CPU

DIVDER

PCI

DIVDER

AGP

DIVDER

Stop

Stop

Stop

SDATA

SCLK

FS (2:0)

PD#

PCI_STOP#

CPU_STOP#

SDRAM_STOP#

AGP-STOP#

MODE

Control

Logic

Config.

Reg.

REF

BUFFERIN

SDRAM (12:0)

13

1

1

1

100

33.33

66.67

1

1

0

95.25

31.75

63.50

1

0

1

83.3

33.30

66.60

1

0

0

97

32.33

64.66

0

1

1

91.5

30.50

61.00

0

1

0

96.22

32.07

64.15

0

0

1

66.67

33.33

66.67

0

0

0

60

30.00

60.00

PCI

(MHz)

FS2

FS1

FS0

CPU, SDRA M

(MHz)

AGP

(MHz)

Functionality

Note:REF&IOAPIC=14.318MHz

Power Groups

Analog

Digital

VDDF

VDDPCI

VDDA

VDDSDR

VDDAGP

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.