Spread Spectrum Clock Generator

MDS 7151 E

2

Revision 012306

Integrated Circuit Systems, Inc.

ICS7151

Pin Assignment

Spread Direction and Percentage

Select Table

Notes:

1. The modulation rate varies with input frequency.

2. Spread will default to ON when ENS pin is left open.

Pin Descriptions

XOUT

GND

S0

VDD

S1

CKOUT

ENS

XIN

1

2

3

4

8

7

6

5

8 pin (150 mil) SOIC

S1

Pin 4

(note1)

S0

Pin 3

(note1)

Spread

Direction

Spread

Percentage (%)

0

0

Center

±1.5

0

1

Center

±0.5

10

Down

-1.0

1

1

Down

-3.0

ENS

(note 2)

Spread Spectrum

0

OFF

1

ON

Pin

Number

Pin

Name

Pin Type

Pin Description

1

XIN

Input

Resonator connection pin/clock input pin.

2

GND

Power

Connect to ground.

3

S0

Input

Select pin 0. Modulation rate setting pin.

4

S1

Input

Select pin 1. Modulation rate setting pin.

5

CKOUT

Output

Modulated clock output pin.

6

ENS

Input

Modulation enable setting pin. Internal pull-up resistor.

7

VDD

Power

Connect to +3.3 V.

8

XOUT

Output

Resonator connection pin.