3

ICS9248- 131

5

.

2

_

#

3

.

3

U

P

C

l

e

v

e

l

t

u

p

n

I

)

a

t

a

D

d

e

h

c

t

a

L

(

r

o

f

d

e

t

c

e

l

e

S

r

e

f

f

u

B

:

t

a

n

o

i

t

a

r

e

p

o

1D

D

V

V

5

.

2

0D

D

V

V

3

.

3

CPU 3.3#_2.5V Buffer selector for CPUCLK drivers.

Power Management Functionality

Mode Pin - Power Management Input Control

5

2

n

i

P

,

E

D

O

M

)

t

u

p

n

I

d

e

h

c

t

a

L

(

7

1

n

i

P8

1

n

i

P0

2

n

i

P1

2

n

i

P

0

#

P

O

T

S

_

U

P

C

)

T

U

P

N

I

(

#

P

O

T

S

_

I

C

P

)

T

U

P

N

I

(

#

P

O

T

S

_

P

G

A

)

T

U

P

N

I

(

#

D

P

)

T

U

P

N

I

(

1

1

1

M

A

R

D

S

)

T

U

P

T

U

O

(

0

1

M

A

R

D

S

)

T

U

P

T

U

O

(

9

M

A

R

D

S

)

T

U

P

T

U

O

(

8

M

A

R

D

S

)

T

U

P

T

U

O

(

#

P

O

T

S

_

P

G

A#

P

O

T

S

_

U

P

C#

P

O

T

S

_

I

C

P

,

P

G

A

K

L

C

U

P

C

s

t

u

p

t

u

O

K

L

C

I

C

P

)

0

:

4

(

,

F

_

K

L

C

I

C

P

z

H

M

8

4

,

F

E

R

M

A

R

D

S

d

n

a

l

a

t

s

y

r

C

C

S

O

O

C

V

P

G

A

)

0

:

1

(

10

1

w

o

L

d

e

p

p

o

t

Sg

n

i

n

n

u

Rg

n

i

n

n

u

Rg

n

i

n

n

u

Rg

n

i

n

n

u

Rg

n

i

n

n

u

R

11

1

g

n

i

n

n

u

Rg

n

i

n

n

u

Rg

n

i

n

n

u

Rg

n

i

n

n

u

Rg

n

i

n

n

u

Rg

n

i

n

n

u

R

11

0

g

n

i

n

n

u

Rw

o

L

d

e

p

p

o

t

Sg

n

i

n

n

u

Rg

n

i

n

n

u

Rg

n

i

n

n

u

Rg

n

i

n

n

u

R

01

1

g

n

i

n

n

u

Rg

n

i

n

n

u

Rg

n

i

n

n

u

Rg

n

i

n

n

u

Rg

n

i

n

n

u

Rw

o

L

d

e

p

p

o

t

S

General Description

The ICS9248-131 generates all clocks required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro

or Cyrix. Eight different reference frequency multiplying factors are externally selectable with smooth frequency transitions.

This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9248-131 employs a

proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations.

output may be used as a feed back into an off chip PLL.