ICS525-01/02

OSCaR™ User Configurable Clock

MDS 525-01/02 I

2

Revision 071100

Printed 11/13/00

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

ICS525-01 Pin Descriptions

Pin #

Name

Type Description

1, 2, 24-28

R5, R6, R0-R4 I(PU) Reference divider word input pins determined by user. Forms a binary number from 0 to 127.

3, 4, 5

S0, S1, S2

I(PU) Select pins for output divider determined by user. See table on page 3.

6, 23

VDD

P

Connect to VDD.

7

X1/ICLK

X1

Crystal connection. Connect to a parallel resonant fundamental crystal, or input clock.

8

X2

X2

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

9, 20

GND

P

Connect to ground.

10-18

V0-V8

I(PU) VCO divider word input pins determined by user. Forms a binary number from 0 to 511.

19

PD

I(PU) Power Down. Active low. Turns off entire chip when low. Clock outputs stop low.

21

CLK

O

Output Clock determined by status of R0-R6, V0-V8, S0-S2 and input frequency.

22

REF

O

Reference output. Buffered crystal oscillator (or clock) output.

ICS525-01

ICS525-02

Key:

I(PU) = Input with internal pull-up resistor; X1, X2 = Crystal connections; O = Output;

P = Power supply connection

ICS525-02 Pin Descriptions

Pin #

Name

Type Description

1, 2, 24-28

R5, R6, R0-R4 I(PU) Reference divider word input pins determined by user. Forms a binary number from 0 to 127.

3, 4, 5

S0, S1, S2

I(PU) Select pins for output divider determined by user. See table on page 3.

6, 23

VDD

P

Connect to VDD.

7

X1/ICLK

X1

Crystal connection. Connect to a parallel resonant fundamental crystal, or input clock.

8

X2

X2

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

9, 20

GND

P

Connect to ground.

10-18

V0-V8

I(PU) VCO divider word input pins determined by user. Forms a binary number from 0 to 511.

19

PDTS

I(PU) Power Down and Tri-state. Active low. Turns off entire chip and tri-states the outputs when low.

21

CLK

O

Output Clock determined by status of R0-R6, V0-V8, S0-S2 and input frequency.

22

REF

O

Reference output. Buffered crystal oscillator (or clock) output.

R4

S2

X1/ICLK

PD

R0

VDD

GND

R1

VDD

REF

CLK

1

8

9

2

3

4

5

6

7

10

11

12

13

14

16

15

20

17

18

19

25

24

23

22

21

26

27

28

V2

X2

V4

GND

R2

V8

R3

V6

V5

R5

R6

V0

V3

V1

S0

S1

V7

R4

X2

VDD

X1/ICLK

GND

REF

CLK

PDTS

1

8

9

2

3

4

5

6

7

10

11

12

13

14

16

15

20

17

18

19

25

24

23

22

21

26

27

28

V2

V4

VDD

GND

R2

V8

R3

R1

V6

V5

R0

R5

R6

V0

V3

V1

S2

S0

S1

V7

Pin Assignments