Integrated

Circuit

Systems, Inc.

General Description

Features

ICS9148-13

Block Diagram

Pentium is a trademark of Intel Corporation

9148-13 Rev A 020398

Pin Configuration

The ICS9148-13 generates all clocks required for high speed

RISC or CISC microprocessor systems such as Intel Pentium

and PentiumPro. An output enable is provided for testability.

Spread Spectrum is available to modulate the CPU and BUS

PLL (leaving the REF, 24, 48 MHz operating normally). The

SS_EN# pin enables the spreading when low. The SS_TYPE

pin choses ±0.5% (nominally) center spread or +0, -2%

(nominally) downspread modulation.

High drive BUS outputs typically provide greater than 1V/ns

slew rate into 30 pF loads. CPU outputs typically provide

better than 1V/ns slew rate into 20 pF loads while maintaining

better than 0.8/ns slew rates.

14.31818MHz, 24MHz and one 48MHz clock for

USB support.

on CPUs and 500 ps window on BUSs

•

CPU to BUS skew, 3.0 to 5.0ns (CPU Early)

48-Pin SSOP

Functionality

2

S

F1

S

F0

S

F

n

i

)

2

1

:

1

(

U

P

C

z

H

M

n

i

)

6

:

1

(

S

U

B

z

H

M

000

5

75

.

7

3

00

1

0

0

13

.

3

3

01

0

5

70

.

0

3

01

1

3

.

3

85

6

.

1

4

10

0

0

55

2

10

1

0

60

3

11

0

7

6

.

6

63

3

.

3

3

111

5

55

.

7

2

E

OF

E

R

4

2

)

z

H

M

(

8

4

)

z

H

M

(

U

P

CS

U

BO

C

VC

S

O

1s

n

u

Rs

n

u

Rs

n

u

Rs

n

u

Rs

n

u

Rs

n

u

Rs

n

u

R

0

-

i

r

T

e

t

a

t

s

-

i

r

T

e

t

a

t

s

-

i

r

T

e

t

a

t

s

-

i

r

T

e

t

a

t

s

-

i

r

T

e

t

a

t

s

s

n

u

Rs

n

u

R

Output Enable

30K pullup resistor to VDD on OE, FS(0:2), SS_EN#, SS_TYPE

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.