ICS650-27

NETWORKING CLOCK SOURCE

CLOCK SYNTHESIZER

IDT™ / ICS™ NETWORKING CLOCK SOURCE

2

ICS650-27

REV F 051310

Pin Assignment

Pin Descriptions

13

4

12

5

11

ASC1

8

9

10

VDD

CLKC2

CLKA2

CCS

CLKB2

DC

17

16

CLKB1

3

X1/ICLK

VDD

CLKA1

18

REFOUT

1

ASC0

X2

BCS0

20

BCS1

19

14

2

7

GND

CLKC1

OE

GND

15

6

20-pin (150 mil) SSOP

Pin

Number

Pin

Name

Pin

Type

Pin Description

1

ACS0

Input

A clock select 0. Selects outputs on CLKA1 and CLKA2 per table on page 3.

2

X2

Input

Crystal connection. Connect to a fundamental crystal or leave unconnected for a clock

input.

3

X1/ICLK

Input

Crystal connection. Connect to a fundamental crystal or clock input.

4

VDD

Power

Connect to +3.3 V or 5 V. Must be the same as pin 16.

5

ACS1

Input

A clock select 1. Selects outputs on CLKA1 and CLKA2 per table on page 3. Internal

pull-up.

6

GND

Power

Connect to ground.

7

CLKC1

Output

Output Clock C1. Depends on setting of CCS per table on page 3.

8

CLKC2

Output

Output Clock C2. Depends on setting of CCS per table on page 3. Same as CLKC1.

9

CLKB2

Output

Output Clock B2. Depends on setting of BCS1, 0 per table on page 3.

10

CLKB1

Output

Output Clock B1. Depends on setting of BCS1, 0 per table on page 3.

11

CCS

Input

Clock C select pin. Selects outputs on CLKC1 and CLKC2 per table on page 3.

12

DC

-

Don’t connect. Do not connect anything to this pin.

13

CLKA2

Output

Output Clock A2. Depends on setting of ACS1, 0 per table on page 3.

14

GND

Power

Connect to ground.

15

OE

Input

Output enable. Tri-states all outputs when low. Internal pull-up.

16

VDD

Power

Connect to +3.3 V or 5 V. Must be the same as pin 4.

17

CLKA1

Output

Output Clock A1. Depends on setting of ACS1, 0 per table on page 3.

18

REFOUT

Output

Buffered reference clock output. Same frequency as crystal or clock input.

19

BCS0

Input

B clock select 0. Selects outputs on CLKB1 and CLKB2 per table on page 3.

20

BCS1

Input

B clock select 1. Selects outputs on CLKB1 and CLKB2 per table on page 3. Internal

pull-up.