DS1213C smartsocket 256k DS1213C 031998 1/2 features ? accepts standard 32k 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 ? proven gastight socket contacts ? operating temperature range 0 c to 70 c pin assignment 28pin intelligent socket 1 2 3 4 5 6 7 8 9 10 11 12 13 gnd 14 28 v cc 27 26 25 24 23 22 21 20 ce 19 18 17 16 15 pin description ce conditioned chip enable v cc switched v cc gnd ground all pins pass through except 20 and 28. description the DS1213C smartsocket is a 28pin, 600 mil dip socket with a builtin cmos controller circuit and an embedded lithium energy source. it accepts a 32k x 8 jedec bytewide cmos static ram. when the socket is mated with a cmos ram, it provides a complete so- lution to problems associated with memory volatility. the smartsocket monitors incoming v cc for an outof tolerance condition. when such a condition occurs, the 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 occu- pies no more area than the memory alone. the smart- socket uses only pins 20 and 28 for ram control. all other pins are passed straight through. see the ds1213b smartsocket data sheet for technical details.
DS1213C 031998 2/2 DS1213C intelligent socket 28pin (for 600 mil dip) 13 equal spaces at 0.100 + 0.010 tna 28 15 114 a g f c k d dim min max 28pin pkg a in. 1.380 1.420 mm 35.05 36.07 b in. 0.690 0.720 mm 17.53 18.29 c in. 0.420 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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