DS1213D

DS1213D SmartSocket 256k/1M www.dalsemi.com FEATURES






PIN ASSIGNMENT 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 1 2 3 4 5 6 7 8 9 10 11 32 31 30 29 28 27 26 25 24 23 22 12 21 13 20 14 15 GND 16 19 VCC VCC CE 18 17 32-Pin Intelligent Socket 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 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. 1 of 2 022900 DS1213D DS1213D INTELLIGENT SOCKET 32-PIN (600 MIL DIP) PKG DIM A IN. MM B IN. MM C IN. MM D IN. MM E IN. MM F IN. MM G IN. MM H IN. MM J IN. MM K IN. MM L IN. MM 2 of 2 32-PIN MIN MAX 1.580 1.620 40.13 41.15 0.690 0.720 17.53 18.29 0.400 0.470 10.16 11.94 0.035 0.065 0.89 1.65 0.055 0.075 1.39 1.90 0.120 0.160 3.04 4.06 0.090 0.110 2.29 2.79 0.590 0.630 14.99 16.00 0.008 0.012 0.20 0.30 0.015 0.021 0.38 0.53 0.380 0.420 9.65 10.67