DS1216D smartwatch/ram 256k/1m DS1216D 031998 1/2 features ? converts standard 8k x 8, 32k x 8, 128k x 8, and 512k x 8 cmos static rams into nonvolatile memory ? embedded lithium energy cell maintains watch infor- mation and retains ram data ? watch function is transparent to ram operation ? keeps track of hundredths of seconds, seconds, min- utes, 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 gastight socket contacts ? full 10% operating range ? operating temperature range 0 c to 70 c ? accuracy is better than 1 min./month @ 25 c pin assignment 1 2 3 4 5 6 7 8 9 10 11 12 dq0 13 14 15 gnd 16 32pin intelligent socket 32 v cc 31 30 v cc 29 we 28 27 26 25 24 oe 23 22 ce 21 20 19 18 17 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 ce conditioned chip enable pin 24 oe output enable pin 29 we write enable pin 30 v cc switched v cc for 28pin ram pin 32 v cc switched v cc for 32pin ram description the DS1216D smartwatch/ram 256k/1m is a 32pin, 600 mil wide dip socket with a builtin 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 prob- lems associated with memory volatility and uses a com- mon energy source to maintain time and date. a key feature of the smartwatch is that the watch function re- mains transparent to the ram. see the ds1216b smartwatch/ram 16/64k data sheet for technical details.
no tag 031998 2/2 DS1216D smartwatch 15 14 28 1 a equal spaces at .100 .010 (tna) g k d c f dim min max 28pin pkg 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 1.390 35.31 1.420 36.07 0.690 17.53 0.720 18.29 0.420 10.67 0.470 11.94 0.035 0.89 0.065 1.65 0.055 1.39 0.075 1.90 0.120 3.04 0.160 4.06 0.090 2.29 0.110 2.79 0.590 14.99 0.630 16.00 0.008 0.20 0.012 0.30 0.015 0.38 0.021 0.53 min max 32pin 1.580 40.13 1.620 41.14 0.690 17.53 0.720 18.29 0.400 10.16 0.470 11.94 0.035 0.89 0.065 1.65 0.055 1.39 0.075 1.90 0.120 3.04 0.160 4.06 0.090 2.29 0.110 2.79 0.590 14.99 0.630 16.00 0.008 0.20 0.012 0.30 0.015 0.38 0.021 0.53 l in. mm 0.380 9.65 0.420 10.67 0.380 9.65 0.420 10.67 h j e b l
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