November 2003

ASM3P2531A

rev 1.0

Low Frequency EMI Reduction

2 of 8

Notice: The information in this document is subject to change without notice.

Pin Configuration

Spread Range Selection, VDD = 3.3 V

CLKIN frequency

Spreading range

Modulation rate

35 MHz – 55 MHz

±1.65%

(CLKIN/1280) KHz

Pin Description

Pin#

Pin Name

Type

Description

1

CLKIN

I

External reference frequency input.

2

VDD

P

Power supply for the entire chip.

3

VSS

P

Ground to entire chip.

4

ModOUT

O

Spread spectrum clock output or reference output. Refer Standby Mode Selection.

5

STOP

I

Active LOW signal. When HIGH, enables ModOUT and when LOW, ModOUT

would be LOW.

6

NC

-

No connect.

7

NC

-

No connect.

8

NC

-

No connect.

8

7

6

5

4

3

2

1

CLKIN

VDD

ModOUT

VSS

STOP

NC

NC

NC

ASM3P2531A