October 2005

ASM3P2872A

rev 1.6

Low Power Peak EMI Reducing Solution

3 of 12

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

XIN/CLKIN

VSS

ModOUT

NC

XOUT

1

2

3

4

5

6

7

8

ASM3P2872A

REFOUT

NC

VDD

Pin Configuration (8-pin SOIC and TSSOP Packages)

Pin Description

Pin#

Pin Name

Type

Description

1

XIN/CLKIN

I

Crystal connection or external reference frequency input. This pin has dual functions. It

can be connected either to an external crystal or an external reference clock.

2

XOUT

O

Crystal connection. If using an external reference, this pin must be left unconnected.

3

REFOUT

O

Buffered output of the input frequency.

4

NC

-

No connect.

5

VSS

P

Ground connection.

6

ModOUT

O

Spread spectrum clock output.

7

NC

-

No connect.

8

VDD

P

Power supply for the entire chip

Modulation Profile

Specifications

Description

Specification

For 2.5V Supply

13MHz < CLKIN < 30MHz

Frequency Range

For 3.3V Supply

13MHz < CLKIN < 30MHz

Modulation Equation

Frequency Deviation

-1.25% @ 30MHz