ICS181-03

MDS 181-03 A

2

Revision 110404

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Pin Assignment

Spread Spectrum Select Table

0 = connect to GND

1 = connect directly to VDD

Note: SS% pin has an internal pull-up resistor

Frequency Range Selection Table

Pin Descriptions

1

2

3

CLKIN

4

NC

GND

FS1

SS%

VDD

CLKOUT

8

7

6

5

SSON#

8-pin (150 mil) SOIC

SS%

(Pin 4)

Spread

Direction

Spread

Percentage (%)

0

Down

-1.25%

1

Down

-3.75%

FS1

(Pin 7)

Frequency Range Selection

(MHz)

0

46-60

1

58-75

Pin

Number

Pin

Name

Pin Type

Pin Description

1

CLKIN

Input

Clock Input.

2

NC

—

No connect. Do not connect this pin to anything.

3

GND

Power

Connect to ground.

4

SS%

Input

Select pin for spread amount. See table above. Internal pull-up resistor.

5

CLKOUT

Output

Spread spectrum clock output per table above.

6

VDD

Power

Connect to 3.3 V or 5 V.

7

FS1

Input

Select pin for input frequency. See table above. Internal pull-up resistor.

8

SSON#

Input

Spread Spectrum Control. This pin enables spread spectrum when low.

Internal pull-down resistor.