ICS4231-03

LOW EMI CLOCK GENERATOR

SSCG

IDT™ / ICS™ LOW EMI CLOCK GENERATOR

2

ICS4231-03

REV C 051310

Pin Assignment

Output Enable Function Table

0 = connect to GND

1 = connect directly to VDD

Note: OE# pin has an internal pull-down resistor

Frequency Range and Spread Table

Note: FS1:0 have internal pull-up resistors

Pin Descriptions

1

2

3

X1/CLKIN

4

X2

GND

FS1

FS0

VDD

CLKOUT

8

7

6

5

OE#

8 pin (150 mil) SOIC

OE#

(Pin 8)

Output Status

0

Running

1Tri-state

FS1

(Pin 7)

FS0

(Pin 4)

Clock Input

Frequency

(MHz)

Crystal Input

Frequency

(MHz)

Spread Amount

0

0

10-20

10-20

±1.875%

0

1

10-20

10-20

±1.0%

1

0

20-33

20-25

±1.875%

1

1

20-33

20-25

-2.0%

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

FS0

Input

Select pin for input frequency and spread amount. See table above. Internal

pull up resistor.

5

CLKOUT

Output

Spread spectrum clock output per table above.

6

VDD

Power

Connect to 5V.

7

FS1

Input

Select pin for input frequency and spread amount. See table above. Internal

pull up resistor.

8

OE#

Input

Output Enable. Active Low. See table above. Internal pull-down resistor.