Networking Clock Synthesizer

MDS 448-16 E

2

Revision 031605

ICS448-16

Pin Assignment

Output Select Table (MHz)

Pin Descriptions

13

4

12

5

11

VDD

8

9

10

VDD

VDD

16

3

S0

CLK1

S1

PDTS

1

X1

GND

VDD

X2

14

2

7

GND

25M

GND

48M

15

6

16-pin (173 mil) TSSOP

CLK2

S1

S0

CLK1

CLK2

0

0

50

48

0

1

66.6666

48

1

0

50

24

1

1

66.6666

24

Pin

Number

Pin

Name

Pin

Type

Pin Description

1

X1

XI

Crystal input. Connect this pin to a crystal or external clock source.

2

GND

Power

Connect to ground.

3

S0

Input

Select pin 0. Internal pull-up resistor.

4

CLK1

Output

Selectable output clock. See table above. Weak internal pull-down when

tri-state.

5

VDD

Power

Connect to voltage supply.

6

GND

Power

Connect to ground.

7

48M

Output

48 MHz output clock. Weak internal pull-down when tri-state.

8

CLK2

Output

Selectable output clock. See table above. Weak internal pull-down when

tri-state.

9

VDD

Power

Connect to voltage supply.

10

25M

Output

25 MHz output clock. Weak internal pull-down when tri-state.

11

GND

Power

Connect to ground.

12

VDD

Power

Connect to voltage supply.

13

S1

Input

Select pin 1. Internal pull-up resistor.

14

PDTS

Input

Power down tri-state. Powers down entire chip and tri-states outputs

when low. Internal pull-up resistor.

15

VDD

Power

Connect to voltage supply.

16

X2

XO

Crystal output. Connect this pin to a crystal. Float for clock input.