ICS650-07C

Networking Clock Source

MDS 650-07C A

3

Revision 101399

Printed 11/28/00

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126•(408)295-9800tel • www.icst.com

PRELIMINARY INFORMATION

Pin Descriptions

Key: TI = tri-level input; XI, XO = crystal connections; I = Input with internal pull-up resistor;

O = Output; P = power supply connection

Pin Assignment

Number

Name

Type

Description

1

ACS0

TI

A Clock Select 0. Selects outputs on CLKA1 and CLKA2 per table on page 2.

2

X2

XO

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

3

X1/ICLK

XI

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

4

VDD

P

Connect to +3.3 V or +5 V. Must be same as other VDD.

5

ACS1

I

A Clock Select 1. Selects outputs on CLKA1 and CLKA2 per table on page 2.

6

GND

P

Connect to ground.

7

CLKC1

O

Clock C output 1. Depends on setting of CCS per table on page 2.

8

CLKC2

O

Clock C output 2. Depends on setting of CCS per table on page 2. Same as CLKC1.

9

CLKB2

O

Clock B output 2. Depends on setting of BCS1, 0 per table on page 2.

10

CLKB1

O

Clock B output 1. Depends on setting of BCS1, 0 per table on page 2.

11

CCS

TI

Clock C Select pin. Selects outputs on CLKC1 and CLKC2 per table on page 2.

12

DC

-

Don't Connect. Do not connect anything to this pin.

13

CLKA2

O

Clock A output 2. Depends on setting of ACS1, 0 per table on page 2.

14

GND

P

Connect to ground.

15

OE

I

Output Enable. Tri-states all outputs when low.

16

VDD

P

Connect to +3.3 V or +5 V. Must be same as other VDD.

17

CLKA1

O

Clock A output 1. Depends on setting of ACS1, 0 per table on page 2.

18

REFOUT

O

Buffered Reference clock Output. Same frequency as crystal or clock input.

19

BCS0

TI

B Clock Select 0. Selects outputs on CLKB1 and CLKB2 per table on page 2.

20

BCS1

I

B Clock Select 1. Selects outputs on CLKB1 and CLKB2 per table on page 2.

1

16

2

3

4

15

14

13

VDD

CLKB2

X2

VDD

20 pin (150 mil) SSOP

5

6

7

8

12

11

10

9

CLKB1

BCS0

X1/ICLK

ACS0

REFOUT

BCS1

CLKA1

DC

CCS

CLKC2

CLKC1

18

17

19

20

GND

ACS1

CLKA2

GND

OE