July 2006

ASM3P4201A

rev 0.2

Multi-Output Custom Clock Generator

2 of 7

Notice: The information in this document is subject to change without notice.

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12

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18

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8

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5

4

3

2

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10

9

19

20

Pin Assignment

Pin Description

Pin #

Pin Name

Pin Type

Pin Description

1

XIN

Input

Crystal connection or external reference frequency input. It can be connected to

a 20MHz Fundamental mode crystal or to an external reference clock.

2

S0

Input

Select Bit for Desired Output Frequency at different output pins. Refer to the

Output Frequency Selection Table for details. Has an internal pull down resistor

3

S1

Input

Select Bit for Desired Output Frequency at different output pins. Refer to the

Output Frequency Selection Table for details. Has an internal pull down resistor

4

CLK6

Output

Clock Output. Refer to the Output Frequency Selection Table for details.

5

VDD

Power

Connect to +3.3V.

6

GND

Power

Connect to ground.

7

CLK1

Output

Clock Output. Refer to the Output Frequency Selection Table for details.

8

NC

-

No connect

9

CLK2

Output

Clock Output. Refer to the Output Frequency Selection Table for details.

10

GND

Power

Connect to ground.

11

NC

-

No connect

12

CLK5

Output

Clock Output. Refer to the Output Frequency Selection Table for details.

13

CLK4

Output

Spread Spectrum Clock Output. Refer to the Output Frequency Selection Table

for details.

14

CLK3

Output

Spread Spectrum Clock Output. Refer to the Output Frequency Selection Table

for details.

15

GND

Power

Connect to ground.

16

VDD

Power

Connect to +3.3V.

17

S2

Input

Select Bit for Desired Output Frequency at different output pins. Refer to the

Output Frequency Selection Table for details. Has an internal pull down resistor

18

STBY

Input

When this pin is made is HIGH, all the output clocks are enabled.

19

VDD

Power

Connect to +3.3V.

20

XOUT

Output

Crystal connection. If an external reference clock is used, this pin must be left

unconnected.

STBY

S2

GND

CLK3

CLK4

CLK5

NC

NC

CLK1

GND

VDD

CLK6

XIN

20 pin TSSOP

ASM3P4201A

VDD

S0

S1

GND

CLK2

XOUT

VDD