DS1647/DS1647P

Nonvolatile Timekeeping RAM

www.artschip.com

2

PIN DESCRIPTION

PIN

PDIP

PowerCap

NAME

FUNCTION

1

34

A18

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

Address Input

31

2

A15

13

16

DQ0

14

15

DQ1

Data Input/Output

15

14

DQ2

17

13

DQ3

18

12

DQ4

19

11

DQ5

20

10

DQ6

Data Input/Output

21

9

DQ7

16

17

GND

Ground

22

8

Active-Low Chip Enable

24

7

Active-Low Output Enable

29

6

Active-Low Write Enable

32

5

Vcc

Power-Supply Input

-

4

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

resistor for proper operation.

-

1

N.C

No Connection

-

Crystal Connections and Battery Connection