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DS1251/DS1251P

4096k NV SRAM with Phantom Clock

www.maxim-ic.com

FEATURES

摟

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Real-time clock keeps track of hundredths of

seconds, minutes, hours, days, date of the

month, months, and years

512k x 8 NV SRAM directly replaces

volatile static RAM or EEPROM

Embedded lithium energy cell maintains

calendar operation and retains RAM data

Watch function is transparent to RAM

operation

Month and year determine the number of

days in each month; valid up to 2100

Over 10 years of data retention in the

absence of power

Full 10% operating range

Lithium energy source is electrically

disconnected to retain freshness until power

is applied for the first time

DIP Module only

鈥?Standard 32-pin JEDEC pinout

鈥?Upward comparable with the DS1248

PowerCap

廬

Module Board only

鈥?Surface mountable package for direct

connection to PowerCap containing

battery and crystal

鈥?Replaceable battery (PowerCap)

鈥?Pin for pin compatible with other densities

of DS124XP phantom clocks

PIN ASSIGNMENT

A18/RST

A16

A14

A12

A7

A6

A5

A4

A3

A2

A1

A0

DQ0

DQ1

DQ2

GND

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

V

CC

A15

A17

WE

A13

A8

A9

A11

OE

A10

CE

DQ7

DQ6

DQ5

DQ4

DQ3

32-Pin Encapsulated Package

740mil Flush

RST

A15

A16

NC

V

CC

WE

OE

CE

DQ7

DQ6

DQ5

DQ4

DQ3

DQ2

DQ1

DQ0

GND

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

X1

GND V

BAT

X2

34

33

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

A18

A17

A14

A13

A12

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

A0

34-Pin PowerCap Module Board

(Uses DS9034PCX PowerCap)

PowerCap is a registered trademark of Dallas Semiconductor.

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