ICS950227 datasheet(1/17 Pages) ICST

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Integrated

Circuit

Systems, Inc.

ICS950227

0641D—07/03/03

Block Diagram

Pin Configuration

56-Pin 300-mil SSOP

Frequency Table

Recommended Application:

CK-408 clock Intel® 845 with P4 processor.

Output Features:

•

3 Differential CPU Clock Pairs @ 3.3V

•

7 PCI (3.3V) @ 33.3MHz

•

3 PCI_F (3.3V) @ 33.3MHz

•

1 USB (3.3V) @ 48MHz

•

1 DOT (3.3V) @ 48MHz

•

1 REF (3.3V) @ 14.318MHz

•

5 3V66 (3.3V) @ 66.6MHz

•

1 VCH/3V66 (3.3V) @ 48MHz or 66.6MHz

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 <150ps

•

3V66 Output Jitter <250ps

•

CPU Output Skew <100ps

* These inputs have 150K internal pull-up resistor to VDD.

Programmable Timing Control Hub™ for P4™

2

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VDDREF

1

56 REF

X1

2

55 FS1

X2

3

54 FS0

GND

4

53 CPU_STOP#*

PCICLK_F0

5

52 CPUCLKT0

PCICLK_F1

6

51 CPUCLKC0

PCICLK_F2

7

50 VDDCPU

VDDPCI

8

49 CPUCLKT1

GND

9

48 CPUCLKC1

PCICLK0 10

47 GND

PCICLK1 11

46 VDDCPU

PCICLK2 12

45 CPUCLKT2

PCICLK3 13

44 CPUCLKC2

VDDPCI 14

43 MULTSEL0*

GND 15

42 IREF

PCICLK4 16

41 GND

PCICLK5 17

40 FS2

PCICLK6 18

39 48MHz_USB

VDD3V66 19

38 48MHz_DOT

GND 20

37 VDD48

3V66_2 21

36 GND

3V66_3 22

35 3V66_1/VCH_CLK

3V66_4 23

34 PCI_STOP#*

3V66_5 24

33 3V66_0

*PD# 25

32 VDD3V66

VDDA 26

31 GND

GND 27

30 SCLK

Vtt_PWRGD# 28

29 SDATA

PLL2

PLL1

Spread

Spectrum

48MHz_USB

PCICLK (6:0)

3V66 (5:2,0)

48MHz_DOT

3V66_1/VCH_CLK

X1

WDEN

XTAL

OSC

CPU

DIVDER

PCI

DIVDER

3V66

DIVDER

PD#

CPU_STOP#

PCI_STOP#

MULTSEL0

SDATA

SCLK

Vtt_PWRGD#

FS (2:0)

I REF

Control

Logic

Config.

Reg.

REF

3

7

5

3

CPUCLKT (2:0)

CPUCLKC (2:0)

PCICLK_F (2:0)

Stop

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