August 2005

ASM3P2579A

rev 1.0

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

ASM3P2579A

SSON

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

I

When SSON is HIGH, the spread spectrum is enabled and when LOW, it turns off the

spread spectrum. Connect the pin to ground When Spread Spectrum feature is not

required.

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

Frequency Range

12MHz < CLKIN < 30MHz

Modulation Equation

Frequency Deviation

±1% @ 24MHz

SSON