DS1213D smartsocket 256k/1m DS1213D 031998 1/2 features ? accepts standard 32k x 8 or 128k x 8 cmos static rams ? embedded lithium energy cell retains ram data ? selfcontained 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 gastight socket contacts ? operating temperature range 0 c to 70 c pin assignment 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 gnd 16 32 v cc 31 30 v cc 29 28 27 26 25 24 23 22 ce 21 20 19 18 17 32pin intelligent socket (600 mil) pin description ce conditioned chip enable v cc switched v cc gnd ground all pins pass through except 22, 30 and 32. description the DS1213D smartsocket is a 32pin, 600 mil dip socket with a builtin 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 outoftolerance condition. when such a condition occurs, an internal lithium energy source is automatical- ly switched on and write protection is unconditionally en- abled to prevent data corruption. using the smartsocket saves printed circuit board space since the sram/smartsocket combination occu- pies no more area than the sram alone. the smart- socket 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 modi- fication instructions to allow use of 512k x 8 ram with this part.
DS1213D 031998 2/2 DS1213D intelligent socket 32pin (600 mil dip) 15 equal spaces at 0.100 + 0.010 tna a g f c k d 1 32 16 17 dim min max 32pin pkg a in. 1.580 1.620 mm 40.13 41.15 b in. 0.690 0.720 mm 17.53 18.29 c in. 0.400 0.470 mm 10.16 11.94 d in. 0.035 0.065 mm 0.89 1.65 e in. 0.055 0.075 mm 1.39 1.90 f in. 0.120 0.160 mm 3.04 4.06 g in. 0.090 0.110 mm 2.29 2.79 h in. 0.590 0.630 mm 14.99 16.00 j in. 0.008 0.012 mm 0.20 0.30 k in. 0.015 0.021 mm 0.38 0.53 l in. 0.380 0.420 mm 9.65 10.67 h j e b l
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