Integrated

Circuit

Systems, Inc.

ICS9248-150

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

9248-150 Rev B 06/12/01

Pin Configuration

48-Pin SSOP and TSSOP

Recommended Application:

ServerWorks Grand Champion Systems.

Output Features:

•

8 - Differential CPU Clock Pairs @ 3.3V

•

1 - 3V 33MHz PCI clocks

•

1 - 48MHz clock

•

1 - Inverted 48MHz clock

•

1 - 14.318 reference output

Features:

•

Up to 200MHz frequency support

•

Support power management: Power Down Mode

•

Supports Spread Spectrum modulation: 0 to -0.5% down

spread.

•

Uses external 14.318MHz crystal

•

Select logic for Differential Swing Control, Test mode,

Tristate, Power down, Spread Spectrum.

•

External resistor for current reference

•

FS pins for frequency select

Key Specifications:

•

PCI Output jitter <500ps

•

CPU Output jitter <200ps

•

48MHz Output jitter <350ps

•

REF Output jitter < 1000ps

Frequency Generator for Multi - Processor Servers

Functionality

/

3

3

1

L

E

S

0

0

1

0

S

F1

S

Fn

o

i

t

c

n

u

F

00

0

z

H

M

0

0

1

e

v

i

t

c

A

00

1

e

d

o

M

t

s

e

T

z

H

M

0

0

1

01

0

e

d

o

M

t

s

e

T

z

H

M

0

0

1

01

1

s

t

u

p

t

u

o

l

l

a

e

t

a

t

s

i

r

T

10

0

z

H

M

3

3

1

e

v

i

t

c

A

10

1

e

d

o

M

t

s

e

T

z

H

M

3

3

1

11

0

z

H

M

0

0

2

e

v

i

t

c

A

11

1

d

e

v

r

e

s

e

R

Block Diagram

PCICLK

VDD48

FS0/48MHz

FS1/48MHz#

GND48

VDDCPU

CPUCLKT0

CPUCLKC0

GNDCPU

CPUCLKT1

CPUCLKC1

VDDCPU

CPUCLKT2

CPUCLKC2

GNDCPU

CPUCLKT3

CPUCLKC3

VDDCPU

REF

SPREAD#

GNDREF

X1

X2

VDDREF

SEL100/133

GNDPCI

VDDA

GNDA

PD#

VDDCPU

CPUCLKT4

CPUCLKC4

GNDCPU

CPUCLKT5

CPUCLKC5

VDDCPU

CPUCLKT6

CPUCLKC6

GNDCPU

CPUCLKT7

CPUCLKC7

VDDCPU

MULTSEL0

MULTSEL1

GND

GNDI REF

I REF

VDDI REF

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

I REF

PLL2

PLL1

Spread

Spectrum

48MHz

PCICLK

48MHz#

X1

X2

XTAL

OSC

CPU

DIVDER

PCI

DIVDER

PD#

SPREAD#

MULTSEL(1:0)

SEL100/133

FS(1:0)

Control

Logic

Config.

Reg.

REF

8

8

CPUCLKT (7:0)

CPUCLKC (7:0)

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

Analog Power Groups

VDD48, GND48 = 48MHz, PLL2

VDDA=VDD (core supply voltage 3.3V)

GNDA=Ground for core supply

Digital Power Group

VDDREF, GNDREF = REF, Xtal