July 2005

P2008A

rev 1.3

General purpose EMI Reduction IC

2 of 9

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

1

2

3

4

5

6

7

8

P2008A

XIN/ CLKIN

XOUT

DIV2

VSS

SSON#

ModOUT

SR0

VDD

Pin Configuration

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

DIV2

I

Digital logic input used to select normal output mode or divide-by-two output

mode. When this pin is HIGH, the frequency of the output clock is the same as the

input clock frequency. When it is tied low, the output frequency is half the input

clock frequency. This pin has an internal pull-up resistor.

4

VSS

P

Ground to entire chip. Connect to system ground.

5

SSON#

I

Digital logic input used to enable Spread Spectrum function (Active LOW). Spread

Spectrum function enabled when LOW, disabled when HIGH.

This pin has an internal pull-low resistor.

6

ModOUT

O

Spread spectrum clock output.

7

SR0

I

Digital logic input used to select Spreading Range (Refer Modulation Output and

Spreading Range Selection Table.) This pin has an internal pull-up resistor.

8

VDD

P

Power supply for the entire chip

Modulation Output and Spreading Selection (ModOUT = XIN/CLKIN)

Output Frequency Range DIV2 = 1

Modulation Rate

SR0

8MHz

12MHz

16MHz

20MHz

24MHz

28MHz

32MHz

0

± 2.2%

± 1.8%

± 1.2%

± 1.1%

± 1.0%

± 0.9%

± 0.8%

1

± 3.2%

± 2.5%

± 2.0%

± 1.6%

± 1.4%

± 1.25%

± 0.15%

(XIN/CLKIN/20) * 62.5 KHz

Modulation Output and Spreading Selection (ModOUT = ½ XIN/CLKIN)

Output Frequency Range DIV2 = 0

Modulation Rate

SR0

4MHz

6MHz

8MHz

10MHz

12MHz

14MHz

16MHz

0

± 2.0%

± 1.8%

± 1.2%

± 1.1%

± 1.0%

± 0.9%

± 0.8%

1

± 3.2%

± 2.6%

± 2.0%

± 1.6%

± 1.4%

± 1.25%

± 0.15%

(XIN/CLKIN/20) * 62.5 KHz