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Integrated

Circuit

Systems, Inc.

ICS9248-97

Frequency Timing Generator for PENTIUM II Systems

Recommended Application:

Camino chipset

Output Features:

聲 3 - CPUs @ 2.5V, up to 180MHz.

聲 3 - IOAPIC @ 2.5V, PCI/2

聲 3 - 3V66MHz @ 3.3V.

聲 11 - PCIs @ 3.3V

聲 1 - 48MHz, @ 3.3V fixed

聲 1 - 24/48MHz, @ 3.3V

聲 1 - CPU/2, @ 2.5V.

Features:

聲 Up to 180MHz frequency support

聲

聲

聲

聲

Support power management: Power down Mode

from I

2

C programming.

Spread spectrum for EMI control

鹵 0.25% center spread).

Uses external 14.318MHz crystal

FS pins for frequency select

Pin Configuration

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#

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

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

48-pin SSOP

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

Key Specifications:

聲 CPU Output Jitter: <250ps

聲

聲

聲

聲

聲

聲

聲

聲

聲

聲

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#

Control

Logic

Config.

Reg.

3V66

DIVDER

IOAPIC

DIVDER

Block Diagram

PLL2

/2

X1

X2

XTAL

OSC

PLL1

Spread

Spectrum

48MHz

24_48MHz

ICS9248-97

REF (1:0)

CPU

DIVDER

CPUCLK (2:0)

/2

CPU/2

IOAPIC (2:0)

PCI

DIVDER

PCICLK (9:0)

PCICLK_F

3V66 (2:0)

9248-97 Rev E 08/18/00

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.

next

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