Low EMI Clock Generator

MDS 1726-11 A

2

Revision 092905

Integrated Circuit Systems, Inc.

ICS1726-11

PRELIMINARY INFORMATION

Pin Assignment

Spread Direction and Percentage

Select Table

0 = connect to GND

M = unconnected (floating)

1 = connect directly to VDD

Pin Descriptions

X1/ICLK

GND

S1

VDD

S0

NC

SSCLK

X2

1

2

3

4

8

7

6

5

8 pin (150 mil) SOIC

8-pin (173 mil) TSSOP

S1

Pin 3

S0

Pin 4

Spread

Direction

Spread

Percentage

0

0

Center

±1.4

0

M

Center

±1.1

0

1

Center

±0.6

M

0

Center

±0.5

MM

No Spread

-

M

1

Down

-1.6

1

0

Down

-2.0

1

M

Down

-0.7

1

1

Down

-3.0

Pin

Number

Pin

Name

Pin Type

Pin Description

1

X1/ICLK

Input

Connect to a 16 to 32 MHz crystal or clock.

2

GND

Power

Connect to ground.

3

S1

Input

Function select 1 input. Selects spread amount and direction per table above.

(default-internal mid-level).

4

S0

Input

Function select 0 input. Selects spread amount and direction per table above.

(default-internal mid-level).

5

SSCLK

Output

Clock output with Spread spectrum.

6

NC

—

No connect. Do not connect this pin to anything.

7

VDD

Power

Connect to +3.3 V.

8

X2

XO

Crystal connection to a 16 to 32 MHz crystal. Leave unconnected for clock.