ICS94225 datasheet(1/18 Pages) ICST

номер детали	ICS94225

подробное описание детали	AMD-K7TM System Clock Chip

PDF	18 Pages

Scroll/Zoom	100%

производитель	ICST [Integrated Circuit Systems]

домашняя страница	http://www.icst.com

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1 / 18 page

Integrated

Circuit

Systems, Inc.

ICS94225

0445B—08/01/03

Block Diagram

Functionality

Pin Configuration

48-Pin 300mil SSOP

Recommended Application:

AMD 750/760 style chipset

Output Features:

•

3 differential pair open drain CPU clocks (1.5V

external

pull-up; up to 150MHz achieviable through I

2C)

•

2 - AGPCLK @ 3.3V

•

8 - PCI @3.3V, including 1 free running

•

1 - 48MHz @ 3.3V

•

1 - 24/48MHz @ 3.3V

•

2- REF @3.3V, 14.318MHz.

Features:

•

Programmable ouput frequency

•

Programmable ouput rise/fall time

•

Programmable group skew

•

Real time system reset output

•

Spread spectrum for EMI control typically

by 7dB to 8dB,

with programmable spread percentage

•

Watchdog timer technology to reset system

if over-clocking causes malfunction

•

Uses external 14.318MHz crystal

AMD-K7TM System Clock Chip

* Internal 120K pullup resistor on indicated inputs

** Internal 240K pullup resistor on indicated inputs

**FS0/REF0

**FS1/REF1

GNDREF

X1

X2

GNDPCI

PCICLK_F

PCICLK0

VDDPCI

PCICLK1

PCICLK2

GNDPCI

PCICLK3

PCICLK4

VDDPCI

PCICLK5

PCICLK6

VDDAGP

AGP0

AGP1

GNDAGP

VDD48

48MHz

SEL24_48#/24-48MHz

VDDREF

GNDSD

SDRAM_OUT

VDDSD

RESERVED

CPUCLKC2

CPUCLKT2

GNDCPU

CPUCLKC1

CPUCLKT1

GND

CPUCLKC0

CPUCLKT0

RESET#

VDD

GND

PCI_STOP#

CPU_STOP#

PD#

SPREAD#

FS2*

SDATA

SCLK

GND48

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

Power Groups

VDD48, GND48 = 48MHz, PLL2

VDDREF, GNDREF= REF, X1, X2

VDD, GND = PLL Core

0

133.33

33.33

66.67

0

1

95

31.67

63.33

0

1

0

100.99

33.66

67.33

0

1

115

38.33

76.67

1

0

100.7

33.57

67.13

1

0

1

103

34.33

68.67

1

0

105

35.00

70.00

1

110

36.67

73.33

PCI

AGP

FS2

FS1

FS0

CPU,

SDRAM

SEL24_48#

SDATA

SCLK

FS (2:0)

PD#

PCI_STOP#

CPU_STOP#

SPREAD#

PLL2

PLL1

Spread

Spectrum

48MHz

24_48MHz

SDRAM_OUT

PCICLK (6:0)

AGP (1:0)

PCICLK_F

2

7

X1

X2

XTAL

OSC

CPU

DIVDER

SDRAM

DIVDER

PCI

DIVDER

AGP

DIVDER

Stop

Control

Logic

Config.

Reg.

/ 2

REF (1:0)

3

CPUCLKT (2:0)

CPUCLKC (2:0)

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