DS1647/DS1647P

2 of 12

PIN DESCRIPTION

PIN

NAME

FUNCTION

PDIP

PowerCap

1

34

A18

Address Input

2

3

A16

3

32

A14

4

30

A12

5

25

A7

6

24

A6

7

23

A5

8

22

A4

9

21

A3

10

20

A2

11

19

A1

12

18

A0

23

28

A10

25

29

A11

26

27

A9

27

26

A8

28

31

A13

30

33

A17

31

2

A15

13

16

DQ0

Data Input/Output

14

15

DQ1

15

14

DQ2

17

13

DQ3

Data Input/Output

18

12

DQ4

19

11

DQ5

20

10

DQ6

21

9

DQ7

16

17

GND

Ground

22

8

CE

Active-Low Chip Enable

24

7

OE

Active-Low Output Enable

29

6

WE

Active-Low Write Enable

32

5

Power-Supply Input

—

4

PFO

Active-Low Power-Fail Output, Open Drain. This pin requires a

pullup resistor for proper operation.

—

1

N.C.

No Connection

—

X1, X2,

Crystal Connections and Battery Connection