Integrated

Circuit

Systems, Inc.

ICS950403

Advance Information

0732—01/27/03

Block Diagram

Functionality

Pin Configuration

Recommended Application:

AMD K8 System Clock with AMD, VIA or ALI Chipset

Output Features:

•

2 - Differential pair push-pull CPU clocks @

3.3V

•

9 - PCICLK (Including 1 free running) @ 3.3V

•

3 - Selectable PCICLK/HTTCLK @ 3.3V

•

1 - HTTCLK @ 3.3V

•

1 - 48MHz @ 3.3V fixed.

•

1 - 24/48MHz @ 3.3V

•

3 - REF @ 3.3V, 14.318MHz.

Features:

•

Programmable output frequency.

•

Programmable output divider ratios.

•

Programmable output rise/fall time.

•

Programmable output skew.

•

Programmable spread percentage for EMI

control.

•

Watchdog timer technology and RESET# output

to reset system

if system malfunctions.

•

Programmable watch dog safe frequency.

•

Support I

write operations.

•

Uses external 14.318MHz crystal.

•

Supports Hyper Transport Technology (HTTCLK).

AMD - K8™ System Clock Chip

ADVANCE INFORMATION documents contain information on products in the formative or design phase development. Characteristic data and other specifications are design goals.

ICS reserves the right to change or discontinue these products without notice. Third party brands and names are the property of their respective owners.

*FS0/REF0 1

48 REF1/FS1*

VDDREF 2

47 GND

X1 3

46 VDDREF

X2 4

45 REF2/FS2*

GND 5

44 Reset#

~*ModeA/HTTCLK0 6

43 VDDA

~*ModeB/PCICLK7/HTTCLK1 7

42 GND

~PCICLK8/HTTCLK2 8

41 CPUCLK8T0

VDDPCI 9

40 CPUCLK8C0

GND 10

39 GND

~PCICLK9/HTTCLK3 11

38 VDDCPU

PCICLK10 12

37 CPUCLK8T1

PCICLK0 13

36 CPUCLK8C1

PCICLK1 14

35 VDDCPU

GND 15

34 GND

VDDPCI 16

33 GND

~PCICLK2 17

32 PD#*

~PCICLK3 18

31 48MHz/FS3**

VDDPCI 19

30 GND

GND 20

29 AVDD48

PCICLK4 21

28 24_48MHz/Sel24_48#*~

PCICLK522

27GND

~PCICLK_F 23

26 SDATA

~PCICLK6 24

25 SCLK

48-SSOP

* Internal Pull-Up Resistor

** Internal Pull-Down Resistor

~ This Output has 2X Drive Strength

CPU

HTT

PCI

MHz

MHz

MHz

0

0

0

0

100.90

67.27

33.63

0

0

0

1

133.90

66.95

33.48

0

0

1

0

168.00

67.20

33.60

0

0

1

1

202.00

67.33

33.67

0

1

0

0

100.20

66.80

33.40

0

1

0

1

133.50

66.75

33.38

0

1

1

0

166.70

66.68

33.34

0

1

1

1

200.40

66.80

33.40

1

0

0

0

150.00

60.00

30.00

1

0

0

1

180.00

60.00

30.00

1

0

1

0

210.00

70.00

35.00

1

0

1

1

240.00

60.00

30.00

1

1

0

0

270.00

67.50

33.75

1

1

0

1

233.33

66.67

33.33

1

1

1

0

266.67

66.67

33.33

1

1

1

1

300.00

75.00

37.50

FS3

FS2

FS1

FS0

PLL2

PLL1

Spread

Spectrum

PCICLK (6:0, 10)

CPUCLKT (1:0)

CPUCLKC (1:0)

X1

X2

XTAL

OSC

CPU

DIVDER

PCI

DIVDER

Stop

SDATA

SCLK

PD#

FS (3:0)

SEL24_48#

MODE (A,B)

Control

Logic

REF (2:0)

48MHz

24_48MHz

/ 2

PCICLK_F

PCICLK/HTTCLK (3:1)

HTTCLK0

X 2

Config.

Reg.