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| DS1216H PRELIMINARY DS1216H SmartWatch/RAM 4M FEATURES PIN ASSIGNMENT * Converts standard 512K x 8 CMOS static RAMs into nonvolatile memory * Embedded lithium energy cell maintains watch information and retains RAM data RST 1 2 3 4 5 6 7 8 9 10 11 12 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 32-PIN INTELLIGENT SOCKET VCC * Watch function is transparent to RAM operation * Keeps track of hundredths of seconds, seconds, minutes, hours, days, date of the month, months, and years WE * Month and year determine the number of days in each month; leap year compensation valid up to 2100 OE * Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time CE * Proven gas-tight socket contacts * Full 10% operating range * Operating temperature range 0C to 70C * Accuracy is better than 1 min./month @ 25C DQ0 13 14 15 GND 16 PIN DESCRIPTION All pins pass through except 22 and 32. - RESET Pin 1 RST Pin 13 DQ0 - Data Input/Output 0 Pin 16 GND - Ground Pin 22 CE - Conditioned Chip Enable Pin 24 OE - Output Enable - Write Enable Pin 29 WE Pin 32 VCC - Switched VCC for 32-pin RAM DESCRIPTION The DS1216H SmartWatch/RAM 4M 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 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. 012199 1/2 DS1216H DS1216H SMARTWATCH 32 17 PKG DIM A IN. MM B IN. MM C IN. MM D IN. MM E IN. MM F IN. MM 1 A H IN. MM J IN. MM K IN. MM L IN. MM 0.590 14.99 0.008 0.20 0.015 0.38 0.380 9.65 0.630 16.00 0.012 0.30 0.021 0.53 0.420 10.67 16 G IN. MM 32-PIN MIN 1.580 40.13 0.690 17.53 0.400 10.16 0.035 0.89 0.055 1.39 0.120 3.04 0.090 2.29 MAX 1.620 41.14 0.720 18.29 0.470 11.94 0.065 1.65 0.075 1.90 0.160 4.06 0.110 2.79 B C E F J D K EQUAL SPACES AT .100 .010 (TNA) G H L 012199 2/2 |
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