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Integrated

Circuit

Systems, Inc.

ICS9248-143

Frequency Generator & Integrated Buffers for PENTIUM

II/III

TM

& K6

Recommended Application:

440BX, MX, VIA Apollo Pro 133, Apollo Pro Media

or MVP4 style chip set, for Note book applications.

Output Features:

聲

4 - CPUs @ 2.5V/3.3V

including 1 free running CPUCLK_F

聲

9 - SDRAM @ 3.3V

聲

7 - PCI @ 3.3V, including 1 free running PCICLK_F

聲 1 - PCI Early @ 3.3V

聲

1 - 48MHz, @ 3.3V fixed.

聲

1 - 24/48MHz @ 3.3V

聲

2 - REF @3.3V, 14.318MHz.

Features:

聲 Up to 137MHz frequency support

聲 97MHz to support high-end AMD processor.

聲 Support power management: CLK, PCI, stop and Power

down Mode from I

2

C programming.

聲 Spread spectrum for EMI control

(鹵.25% & 0 to -0.5% down spread).

聲 Uses external 14.318MHz crystal

聲 FS pins for frequency select

Key Specifications:

聲 CPU Output Jitter @ 2.5V: <300ps

聲 CPU Output Jitter @ 3.3V: <250ps

聲 PCI Output Jitter @ 3.3V: <250ps

聲 CPU Output Skew @ 2.5V: <175ps

聲 CPU Output Skew @ 3.3V: <175ps

聲 PCI Output Skew @ 3.3V: <500ps

聲 PCI Early to PCI Skew @ 3.3V: typ = 3ns

Pin Configuration

VDDREF

*SPREAD/REF0

GNDREF

X1

X2

VDDPCI

*CPU2.5_3.3#/PCICLK_F

*FS3/PCICLK0

GNDPCI

*SEL24_48#/PCICLK1

*SELPCIE_6#/PCICLK2

PCICLK3

PCICLK4

VDDPCI

BUFFER IN

GNDPCI

PCICLK5

PCICLK6/PCICLK_E

VDDCOR

PCI_STOP#

*PD#

GND48

SDATA

SCLK

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

REF1/FS2*

VDDLCPU

CPUCLK_F

CPUCLK0

GNDLCPU

CPUCLK1

CPUCLK2

CLK_STOP#

GNDSDR

SDRAM_F

SDRAM0

SDRAM1

VDDSDR

SDRAM2

SDRAM3

GNDSDR

SDRAM4

SDRAM5

VDDSDR

SDRAM6

SDRAM7

VDD48

48MHz/FS0*

24_48MHz/FS1*

48-Pin SSOP and TSSOP

* Internal Pull-up Resistor of 120K to VDD

Functionality

FS3

FS2

0

0

0

0

1

1

1

1

0

0

0

0

1

1

1

1

FS1

0

0

1

1

0

0

1

1

0

0

1

1

0

0

1

1

FS0

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

0

0

0

0

0

0

0

1

1

1

1

1

1

1

1

CPU

(MHz)

66.67

100.00

100.30

133.33

105.00

133.37

137.00

75.00

100.00

95.00

97.00

133.33

90.00

96.22

66.82

91.50

PCI

(MHz)

33.33

33.33

33.43

33.33

35.00

33.34

34.25

37.50

33.33

31.67

32.33

33.33

30.00

32.07

33.41

30.50

Block Diagram

PLL2

48MHz

/2

X1

X2

BUFFER IN

CPUCLK_F

PLL1

Spread

Spectrum

FS(0:3)

4

SEL24_48#

STOP

24_48MHz

2

XTAL

OSC

REF[1:0]

3

CPUCLK [2:0]

LATCH

STOP

8

SDRAM [7:0]

SDRAM_F

4

POR

CLK_STOP#

PCI_STOP#

CPU2.5_3.3#

SDATA

SCLK

PD#

Control

Logic

Config.

Reg.

PCI

CLOCK

DIVDER

STOP

6

PCICLK [5:0]

PCICLK_F

PCICLK_E

Pentium is a trademark of Intel Corporation

I

2

C is a trademark of Philips Corporation

9248-143 Rev C 7/26/00

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.

ICS9248-143

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