Integrated

Circuit

Systems, Inc.

ICS94206

94206 Rev B 04/26/01

Pin Configuration

Recommended Application:

440BX - VIA Apollo Pro133 - ALI 1631 style chipset.

Output Features:

•

2 - CPUs @2.5V

•

1 - IOAPIC @ 2.5V

•

13 - SDRAM @ 3.3V

•

6 - PCI @3.3V,

•

1 - 48MHz, @3.3V

•

1 - 24MHz @ 3.3V

•

2 - REF @3.3V, 14.318MHz.

Features:

•

Programmable ouput frequency.

•

Programmable ouput rise/fall time.

•

Programmable PCI_F and PCICLK skew.

•

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.

•

FS pins for frequency select

Key Specifications:

•

CPU – CPU: <175ps

•

SDRAM - SDRAM: <500ps

•

PCI – PCI: <500ps

•

CPU(early)-PCI: Min=1.0ns, Typ=2.0ns, Max=4.0ns

Programmable System Frequency Generator for PII/III™

Block Diagram

48-Pin 300mil SSOP

CLK_STOP#

PCI_STOP#

PLL2

PLL1

Spread

Spectrum

48MHz

24MHz

IOAPIC

CPUCLK_F

CPUCLK 1

SDRAM (11:0)

PCICLK (4:0)

PCICLKF

SDRAM_F

X1

X2

BUFFER IN

XTAL

OSC

PCI

CLOCK

DIVDER

STOP

STOP

STOP

STOP

SDATA

SCLK

FS(3:0)

MODE

Control

Logic

Config.

Reg.

/2

REF(1:0)

LATCH

POR

2

12

5

4

4

VDD1

*PCI_STOP/REF0

GND

X1

X2

VDD2

*MODE/PCICLK_F

**FS3/PCICLK0

GND

PCICLK1

PCICLK2

PCICLK3

PCICLK4

VDD2

BUFFER IN

GND

SDRAM11

SDRAM10

VDD3

SDRAM9

SDRAM8

GND

SDATA

SCLK

VDDL1

IOAPIC

REF1/FS2*

GND

CPUCLK_F

CPUCLK1

VDDL2

CLK_STOP#*

SDRAM_F

GND

SDRAM0

SDRAM1

VDD3

SDRAM2

SDRAM3

GND

SDRAM4

SDRAM5

VDD3

SDRAM6

SDRAM7

VDD4

48MHz/FS0*

24MHz/FS1*

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

* Internal Pull-up Resistor of 120K to VDD

** Internal Pull-down resistor of 120K to GND

Functionality

3

S

F2

S

F1

S

F0

S

F

U

P

C

)

z

H

M

(

K

L

C

I

C

P

)

z

H

M

(

0000

0

0

.

0

80

0

.

0

4

000

1

0

0

.

5

70

5

.

7

3

00

1

0

1

3

.

3

85

6

.

1

4

00

11

2

8

.

6

61

4

.

3

3

01

0

0

0

0

.

3

0

13

3

.

4

3

01

01

1

0

.

2

1

14

3

.

7

3

01

1

0

1

0

.

8

61

0

.

4

3

0

111

3

2

.

0

0

11

4

.

3

3

1

000

0

0

.

0

2

10

0

.

0

4

10

0

1

9

9

.

4

1

13

3

.

8

3

10

10

9

9

.

9

0

16

6

.

6

3

10

1

1

0

0

.

5

0

10

0

.

5

3

11

00

0

0

.

0

4

10

0

.

5

3

11

0

1

0

0

.

0

5

10

5

.

7

3

111

0

0

0

.

4

2

10

0

.

1

3

1111

9

9

.

2

3

15

2

.

3

3

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.