DS1213D DALLAS | Alldatasheet
Document overview
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Technical content
FEATURES
/elevenoclock Accepts standard 32K x 8 or 128K x 8 CMOS static RAMs /elevenoclock Embedded lithium energy cell retains RAM data /elevenoclock Self-contained circuitry safeguards data /elevenoclock Data retention time is greater than 10 years with the proper RAM selection /elevenoclock IC socket permits upgrading from 32K x 8 to 128K x 8 RAM /elevenoclock Proven gas-tight socket contacts /elevenoclock Operating temperature range 0°C to 70°C PIN ASSIGNMENT PIN DESCRIPTION CE - Conditioned Chip Enable VCC - Switched VCC GND - 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 V CC 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. DS1213D SmartSocket 256k/1M www.dalsemi.com
30 VCC
32 VCC
DS1213D INTELLIGENT SOCKET 32-PIN (600 MIL DIP) PKG 32-PIN DIM MIN MAX A IN. MM 1.580 40.13 1.620 41.15 B IN. MM 0.690 17.53 0.720 18.29 C IN. MM 0.400 10.16 0.470 11.94 D IN. MM 0.035 0.89 0.065 1.65 E IN. MM 0.055 1.39 0.075 1.90 F IN. MM 0.120 3.04 0.160 4.06 G IN. MM 0.090 2.29 0.110 2.79 H IN. MM 0.590 14.99 0.630 16.00 J IN. MM 0.008 0.20 0.012 0.30 K IN. MM 0.015 0.38 0.021 0.53 L IN. MM 0.380 9.65 0.420 10.67