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ICS9248F-169-T

Frequency Generator & Integrated Buffers for Celeron & PII/III™

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

ICS9248-169

Frequency Generator & Integrated Buffers for Celeron & PII/III™

Recommended Application:

440BX/VIA Apollo 133/694X style chipset.

Output Features:

• 2 - CPUs @2.5V, up to 166MHz.

• 1 - IOAPIC @ 2.5V

• 13 - SDRAM @ 3.3V

• 6 - PCI @3.3V,

• 1 - 48MHz, @3.3V fixed.

• 1 - 24MHz @ 3.3V

• 2 - REF @3.3V, 14.318MHz.

Features:

• Up to 166MHz frequency support

• Support power management: PCI, CPU stop and Mode

• Spread spectrum for EMI control (± 0.50%).

• Uses external 14.318MHz crystal

Skew Specifications:

• CPU – CPU: <175ps

• SDRAM - SDRAM: <500ps

• PCI – PCI: <500ps

• CPU(early)-PCI: Typ=1.0ns

VDDREF

*PCI_STOP/REF0

GND

X1

X2

VDDPCI

*MODE/PCICLK_F

**FS3/PCICLK0

GND

PCICLK1

PCICLK2

PCICLK3

PCICLK4

VDDA

BUFFER IN

GND

SDRAM11

SDRAM10

VDDSDR

SDRAM9

SDRAM8

GND

SDATA

SCLK

Pin Configuration

1

48

VDDL

2

47

IOAPIC

3

46

REF1/FS2*

4

45

GND

5

44

CPUCLK_F

6

43

CPUCLK1

7

42

VDDL

8

41

CLK_STOP#*

9

40

SDRAM_F

10

39

GND

11

38

SDRAM0

12

37

SDRAM1

13

36

VDDSDR

14

35

SDRAM2

15

34

SDRAM3

16

33

GND

17

32

SDRAM4

18

31

SDRAM5

19

30

VDDSDR

20

29

SDRAM6

21

28

SDRAM7

22

27

VDD48

23

26

48MHz/FS0*

24

25

24MHz/FS1*

48-Pin 300mil SSOP

* Internal Pull-up Resistor of 120K to VDD

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

Block Diagram

PLL2

/2

X1

XTAL

X2

OSC

STOP

BUFFER IN

FS(3:0) 4

MODE

CLK_STOP#

PCI_STOP#

SDATA

SCLK

PLL1

Spread

Spectrum

LATCH

4

POR

Control

Logic

Config.

Reg.

STOP

STOP

PCI

CLOCK

DIVDER

STOP

48MHz

24MHz

IOAPIC

2 REF(1:0)

CPUCLK_F

CPUCLK 1

12 SDRAM (11:0)

SDRAM_F

PCICLK (4:0)

5

PCICLKF

Functionality

FS3 FS2 FS1 FS0

0

0

0

0

0

0

0

1

0

0

1

0

0

0

1

1

0

1

0

0

0

1

0

1

0

1

1

0

0

1

1

1

1

0

0

0

1

0

0

1

1

0

1

0

1

0

1

1

1

1

0

0

1

1

0

1

1

1

1

0

1

1

1

1

CPU

(MHz)

80.00

75.00

83.31

66.82

103.00

112.01

68.01

100.23

120.00

114.99

109.99

105.00

140.00

150.00

124.00

133.33

PCICLK

(MHz)

40.00

37.50

41.65

33.41

34.33

37.34

34.01

33.41

40.00

38.33

36.66

35.00

35.00

37.50

31.00

33.33

9248-169 Rev A- 6/05/01

Third party brands and names are the property of their respective owners.

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.

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