technical data in74act138 1-of-8 decoder/demultiplexer high-speed silicon-gate cmos ordering information in74act138n plastic IN74ACT138D soic t a = -40 to 85 c for all packages the in74act138 is identical in pinout to the ls/als138, hc/hct138. the in74act138 may be used as a level converter for interfacing ttl or nmos outputs to high speed cmos inputs. the in74act138 decodes a three-bit address to one-of-eight active- lot outputs. this device features three chip select inputs, two active-low and one active-high to facilitate the demultiplexing, cascading, and chip- selecting functions. the demultiplexi ng function is accomplished by using the address inputs to select the desired device output; one of the chip selects is used as a data input while the other chip selects are held in their active states. ? ttl/nmos compatible input levels ? outputs directly interf ace to cmos, nmos, and ttl ? operating voltage range: 4.5 to 5.5 v ? low input current: 1.0 a; 0.1 a @ 25 c pin assignment ? outputs source/sink 24 ma logic diagram pin 16 =v cc pin 8 = gnd function table inputs outputs cs1 cs2 cs3 a2 a1 a0 y0 y1 y2 y3 y4 y5 y6 y7 x x h x h x l x x x x x x x x x x x h h h h h h h h h h h h h h h h h h h h h h h h h l l h l l h l l h l l l l l l l h l h l l h h l h h h h h h h h l h h h h h h h h l h h h h h h h h l h h h h h l l h l l h l l h l l h l l h l h h h l h h h h h h h l h h h h h h h h l h h h h h h h h l h h h h h h h h l h = high level (steady state) l = low level (steady state) x = don?t care rev. 00
in74act138 rev. 00 maximum ratings * symbol parameter value unit v cc dc supply voltage (referenced to gnd) -0.5 to +7.0 v v in dc input voltage (referenced to gnd) -0.5 to v cc +0.5 v v out dc output voltage (referenced to gnd) -0.5 to v cc +0.5 v i in dc input current, per pin 20 ma i out dc output sink/source current, per pin 50 ma i cc dc supply current, v cc and gnd pins 50 ma p d power dissipation in still air, plastic dip+ soic package+ 750 500 mw tstg storage temperature -65 to +150 c t l lead temperature, 1 mm from case for 10 seconds (plastic dip or soic package) 260 c * maximum ratings are those values beyond which damage to the device may occur. functional operation should be restricted to the reco mmended operating conditions. +derating - plastic dip: - 10 mw/ c from 65 to 125 c soic package: : - 7 mw/ c from 65 to 125 c recommended operating conditions symbol parameter min max unit v cc dc supply voltage (referenced to gnd) 4.5 5.5 v v in , v out dc input voltage, output voltage (referenced to gnd) 0 v cc v t j junction temperature (pdip) 140 c t a operating temperature, all package types -40 +85 c i oh output current - high -24 ma i ol output current - low 24 ma t r , t f input rise and fall time * (except schmitt inputs) v cc =4.5 v v cc =5.5 v 0 0 10 8.0 ns/v * v in from 0.8 v to 2.0 v this device contains protection circuitry to guard agains t damage due to high static voltages or electric fields. however, precautions must be taken to avoid applications of any voltage highe r than maximum rated voltages to this high-impedance circuit. for proper operation, v in and v out should be constrained to the range gnd (v in or v out ) v cc . unused inputs must always be tied to an appropriate logic voltage level (e.g., either gnd or v cc ). unused outputs must be left open.
in74act138 rev. 00 dc electrical characteristics (voltages referenced to gnd) v cc guaranteed limits symbol parameter test conditions v 25 c -40 c to 85 c unit v ih minimum high- level input voltage v out =0.1 v or v cc -0.1 v 4.5 5.5 2.0 2.0 2.0 2.0 v v il maximum low - level input voltage v out =0.1 v or v cc -0.1 v 4.5 5.5 0.8 0.8 0.8 0.8 v v oh minimum high- level output voltage i out -50 a 4.5 5.5 4.4 5.4 4.4 5.4 v * v in =v ih or v il i oh =-24 ma i oh =-24 ma 4.5 5.5 3.86 4.86 3.76 4.76 v ol maximum low- level output voltage i out 50 a 4.5 5.5 0.1 0.1 0.1 0.1 v * v in = v ih or v il i ol =24 ma i ol =24 ma 4.5 5.5 0.36 0.36 0.44 0.44 i in maximum input leakage current v in =v cc or gnd 5.5 0.1 1.0 a i cct additional max. i cc /input v in =v cc - 2.1 v 5.5 1.5 ma i old +minimum dynamic output current v old =1.65 v max 5.5 75 ma i ohd +minimum dynamic output current v ohd =3.85 v min 5.5 -75 ma i cc maximum quiescent supply current (per package) v in =v cc or gnd 5.5 8.0 80 a * all outputs loaded; thresholds on input associated with output under test. +maximum test duration 2.0 ms, one output loaded at a time.
in74act138 ac electrical characteristics (v cc =5.0 v 10%, c l =50pf,input t r =t f =3.0 ns) guaranteed limits symbol parameter 25 c -40 c to 85 c unit min max min max t plh propagation delay, input a to output y (figure 1) 1.5 10.5 1.5 11.5 ns t phl propagation delay, input a to output y (figure 1) 1.5 10.5 1.5 11.5 ns t plh propagation delay, cs2 or cs3 to output y (figure 3) 2.5 11.5 2.0 12.5 ns t phl propagation delay, cs2 or cs3 to output y (figure 3) 2.0 11.5 2.0 12.5 ns t plh propagation delay, cs1 to output y (figure 2) 2.5 12.0 2.0 13.0 ns t phl propagation delay, cs1 to output y (figure 2) 2.0 10.5 1.5 11.5 ns c in maximum input capacitance 4.5 4.5 pf typical @25 c,v cc =5.0 v c pd power dissipation capacitance 60 pf figure 1. switching waveforms figure 2. switching waveforms figure 3. switching waveforms rev. 00
in74act138 expanded logic diagram rev. 00
in74act138 n suffix plastic dip (ms - 001bb) symbol min max a 18.67 19.69 b 6.1 7.11 c 5.33 d 0.36 0.56 f 1.14 1.78 g h j 0 10 k 2.92 3.81 notes: l 7.62 8.26 1. dimensions ?a?, ?b? do not include mold flash or protrusions. m 0.2 0.36 maximum mold flas h or protrus ions 0.25 mm (0.010) per s ide. n 0.38 d suffix soic (ms - 012ac) symbol min max a 9.8 10 b 3.8 4 c 1.35 1.75 d 0.33 0.51 f 0.4 1.27 g h j 0 8 notes: k 0.1 0.25 1. dimensions a and b do not include mold flash or protrusion. m 0.19 0.25 2. maximum mold flas h or protrus ion 0.15 mm (0.006) per s ide p 5.8 6.2 for a; for b ? 0.25 mm (0.010) per s ide. r 0.25 0.5 5.72 2.54 7.62 1.27 dimens ion, mm dimens ion, mm a b h c k c m j f m p g d r x 45 seating plane 0.25 (0.010) m t -t- 1 16 8 9 l h m j a b f g d seating plane n k 0.25 (0.010) m t -t- c 1 16 8 9 rev. 00
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