ICS181-51

MDS 181-51 A

2

Revision 110404

www.icst.com

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

X1/CLKIN

4

X2

GND

FS1

SS%

VDD

CLKOUT

8

7

6

5

FS2

8 pin (150 mil) SOIC

SS%

(Pin 4)

Spread

Direction

Spread

Percentage (%)

0

Center

+/-0.625%

1

Center

+/1.875%

FS2

(Pin 8)

FS1

(Pin 7)

Frequency

Range Selection

(MHz)

0

0

28-38

0

1

38-48

1

0

46-60

1

1

58-75

Pin

Number

Pin

Name

Pin Type

Pin Description

1

X1/CLKIN

Input

Crystal or Clock Input.

2

X2

Output

Crystal output. Float for a clock input.

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

FS2

Input

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