ICS950508YFLF-T datasheet(1/19 Pages) ICST

Part #	ICS950508YFLF-T

Description	Programmable Timing Control HubTM for PII/IIITTM

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Manufacturer	ICST [Integrated Circuit Systems]

Direct Link	http://www.icst.com

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Integrated

Circuit

Systems, Inc.

ICS950508

0470E—04/06/05

Block Diagram

Pin Configuration

Recommended Application:

810/810E/815 and 815 B-Step 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/Benefits:

•

Programmable output frequency.

•

Programmable output divider ratios.

•

Programmable output rise/fall time.

•

Programmable output skew.

•

Programmable spread percentage for EMI control.

•

Watchdog timer technology to reset system

if system malfunctions.

•

Programmable watch dog safe frequency.

•

Support I

2C Index read/write and block read/write

operations.

•

Uses external 14.318MHz crystal.

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.

Programmable Timing Control Hub™ for PII/III™

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

* Internal Pull-up resistor of 120K to VDD

56-Pin 300-mil SSOP

VDDREF

X1

X2

GND

3V66_0

3V66_1

3V66_2

VDD3V66

VDDPCI

*FS0/PCICLK0

*FS1/PCICLK1

*SEL24_48#/PCICLK2

GND

PCICLK3

PCICLK4

PCICLK5

VDDPCI

PCICLK6

PCICLK7

GND

Vtt_PWRGD/PD#

SCLK

SDATA

VDDSDR

SDRAM11

SDRAM10

GND

1

REF0/FS4 *

VDDLAPIC

IOAPIC

VDDLCPU

CPUCLK0

CPUCLK1

GND

SDRAM0

SDRAM1

SDRAM2

VDDSDR

SDRAM3

SDRAM4

SDRAM5

GND

SDRAM6

SDRAM7

SDRAM_F

VDDSDR

GND

24_48MHz/FS2*

48MHZ/FS3*

VDD48

VDDSDR

SDRAM8

SDRAM9

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

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

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#

Vtt_PWRGD

SDATA

SCLK

Control

Logic

Config.

Reg.

/ 2

REF0

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