Integrated

Circuit

Systems, Inc.

ICS94201

94201 Rev A - 05/24/01

Pin Configuration

Recommended Application:

810/810E and Solano (815) type chipset

Output Features:

•

2 - CPUs @ 2.5V

•

13 - SDRAM @ 3.3V

•

3 - 3V66 @ 3.3V

•

8 - PCI @3.3V

•

1 - 24/48MHz@ 3.3V

•

1 - 48MHz @ 3.3V fixed

•

1 - REF @3.3V, 14.318MHz

Features:

•

Programmable ouput frequency.

•

Programmable ouput rise/fall time for PCI

and SDRAM clocks.

•

Programmable 3V66 to PCI skew.

•

Spread spectrum for EMI control

with programmable spread percentage.

•

Watchdog timer technology to reset system

if over-clocking causes malfunction.

•

Support power management through PD#.

•

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

•

CPU Output Skew: <175ps

•

PCI Output Skew: <500ps

•

3V66 Output Skew <175ps

•

For group skew timing, please refer to the

Group Timing Relationship Table.

Programmable System Frequency Generator for 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.

PLL2

PLL1

Spread

Spectrum

48MHz

24_48MHz

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#

SEL24_48#

SDATA

SCLK

Control

Logic

Config.

Reg.

/ 2

REF0

Block Diagram

VDDREF

X1

X2

GNDREF

GND3V66

3V66-1

3V66-2

VDD3V66

VDDPCI

*(FS0)PCICLK0

*(FS1)PCICLK1

*(SEL24_48#)PCICLK2

GNDPCI

PCICLK3

PCICLK4

PCICLK5

VDDPCI

PCICLK6

PCICLK7

GNDPCI

PD#

SCLK

SDATA

VDDSDR

SDRAM11

SDRAM10

GNDSDR

3V66-0

1

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

24_48MHz(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

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.