DS1213B
SmartSocket 16k/64k
www.dalsemi.com
FEATURES
Accepts standard 2K x 8 or 8K 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 proper RAM selection
IC socket permits upgrading from 2K x 8 to
8K 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
GND 14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
CC
V
CC
CE
28-Pin Intelligent Socket
PIN DESCRIPTION
- Conditioned Chip Enable
V
CC
- Switched V
CC
GND
- Ground
All pins pass through except 20, 26 and 28.
CE
DESCRIPTION
The DS1213B SmartSocket is a 28-pin, 600 mil DIP socket with a built-in CMOS controller circuit and
an embedded lithium energy source. It accepts either 24-pin 2K x 8 (lower-justified) or 28-pin 8K 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 Smart-Socket monitors incoming
V
CC
for an out-of-tolerance condition. When such a condition occurs, the 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 modifies only pins 20, 26 and 28, to
nonvolatize the RAM. All other pins are passed straight through.
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022900
DALLAS [ DALLAS SEMICONDUCTOR ]
