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DS1213D

SmartSocket 256k/1M

Dallas Semiconductor -> Maxim Integrated 

DS1213D

SmartSocket 256k/1M

www.dalsemi.com

FEATURES

Accepts standard 32K x 8 or 128K x 8

CMOS static RAMs

Embedded lithium energy cell retains RAM

data

Self-contained circuitry safeguards data

Data retention time is greater than 10 years

with the proper RAM selection

IC socket permits upgrading from 32K x 8 to

128K x 8 RAM

Proven gas-tight socket contacts

Operating temperature range 0°C to 70°C

PIN ASSIGNMENT

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

GND 16

32 VCC

31

30 VCC

29

28

27

26

25

24

23

22 CE

21

20

19

18

17

32-Pin Intelligent Socket

PIN DESCRIPTION

CE

- Conditioned Chip Enable

VCC

GND

- Switched VCC

- Ground

All pins pass through except 22, 30 and 32.

DESCRIPTION

The DS1213D SmartSocket is a 32-pin, 600 mil DIP socket with a built-in CMOS controller circuit and

an embedded lithium energy source. It accepts 32K x 8 or 128K x 8 JEDEC bytewide CMOS static

RAM. When the socket is mated with a CMOS RAM, it provides a complete solution to problems

associated with memory volatility. The SmartSocket monitors incoming VCC for an out-of-tolerance

condition. When such a condition occurs, an internal lithium energy source is automatically switched on

and write protection is unconditionally enabled to prevent data corruption. Using the SmartSocket saves

printed circuit board space since the SRAM/SmartSocket combination occupies no more area than the

SRAM alone. The SmartSocket uses only Pins 22, 30 and 32 for RAM control. All other pins are passed

straight through.

See the DS1213B SmartSocket data sheet for technical details.

See Dallas Semiconductor Application Note 4 for modification instructions to allow use of 512K x8

RAM with this part.

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022900

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