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| DS1216D SmartWatch/RAM 256K/1M www.dalsemi.com FEATURES Converts standard 8K x 8, 32K x 8, and 512K x 8 CMOS static RAMs into nonvolatile memory Embedded lithium energy cell maintains watch information and retains RAM data Watch function is transparent to memory operation Keeps track of hundredths of seconds, seconds, minutes, hours, days, date of the month, months, and years Month and year determine the number of days in each month; leap year compensation valid up to 2100 Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time Proven gas-tight socket contacts Full 10% operating range Operating temperature range 0C to 70C Accuracy is better than 1 minute/month @ 25C PIN ASSIGNMENT RST 1 2 3 4 5 6 7 8 9 10 11 12 DQ0 13 14 15 GND 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 CE VCC WE VCC OE 32-Pin Intelligent Socket PIN DESCRIPTION All pins pass through except 22, 30 and 32. Pin 1 RST - RESET Pin 13 DQ0 - Data Input/Output 0 Pin 16 GND - Ground Pin 22 Pin 24 Pin 29 Pin 30 Pin 32 CE OE WE VCC VCC - Conditioned Chip Enable - Output Enable - Write Enable - Switched VCC for 28-pin RAM - Switched VCC for 32-pin RAM DESCRIPTION The DS1216D SmartWatch/RAM 256K/1M is a 32-pin, 600-mil wide DIP socket with a built-in CMOS watch function, a nonvolatile RAM controller circuit, and an embedded lithium energy source. It accepts either an 8K x 8, 32K x 8, 128K x 8, or 512K x 8 JEDEC bytewide CMOS static RAM. When the socket is mated with a CMOS SRAM, it provides a complete solution to problems associated with memory volatility and uses a common energy source to maintain time and date. A key feature of the SmartWatch is that the watch function remains transparent to the RAM. See the DS1216B SmartWatch/RAM 16/64K data sheet for technical details. 1 of 2 102799 DS1216D DS1216D SMARTWATCH 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 28-PIN 32-PIN MIN MAX MIN MAX 1.390 1.420 1.580 1.620 35.31 36.07 40.13 41.14 0.690 0.720 0.690 0.720 17.53 18.29 17.53 18.29 0.420 0.470 0.400 0.470 10.67 11.94 10.16 11.94 0.035 0.065 0.035 0.065 0.89 1.65 0.89 1.65 0.055 0.075 0.055 0.075 1.39 1.90 1.39 1.90 0.120 0.160 0.120 0.160 3.04 4.06 3.04 4.06 0.090 0.110 0.090 0.110 2.29 2.79 2.29 2.79 0.590 0.630 0.590 0.630 14.99 16.00 14.99 16.00 0.008 0.012 0.008 0.012 0.20 0.30 0.20 0.30 0.015 0.021 0.015 0.021 0.38 0.53 0.38 0.53 0.380 0.420 0.380 0.420 9.65 10.67 9.65 10.67 A C F 2 of 2 102799 |
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