tc74act138p/f/ft 2012-02-29 1 toshiba cmos digital integrat ed ci rcuit silicon monolithic tc74act138p,tc74act138f, tc74act138ft 3-to-8 line decoder the tc74act138 is an advanced high speed cmos 3-to-8 line decoder fabricated with silicon gate and double-layer metal wiring c 2 mos technology. it achieves the high speed op eration similar to equivalent bipolar schottky ttl while main taining the cmos low power dissipation. this device may be used as a level converter for interfacing ttl or nmos to high speed cmos . the inputs are compatible with ttl, nmos and cmos output voltage levels. when the device is enabled, 3 binary select inputs (a, b and c) determine which one of the outputs ( 0y - 7y ) will go low. when enable input g1 is held low or either a2g or 2bg is held high, decoding function is inhibited and all outputs go high. g1, a2g , and 2bg inputs are provided to ease cascade connection and for use as an address decoder for memory systems. all inputs are equipped with prot ection circuits against static discharge or transi ent excess voltage. features ? high speed: t pd = 6.0 ns (typ.) at v cc = 5 v ? low power dissipation: i cc = 8 a (max) at ta = 25c ? compatible with ttl outputs: v il = 0.8 v (max) v ih = 2.0 v (min) ? symmetrical output impedance: |i oh | = i ol = 24 ma (min) capability of driving 50 ? transmission lines. ? balanced propagation delays: t plh ? t phl ? pin and function compatible with 74f138 tc74act138p tc74act138f tc74act138ft weight dip16-p-300-2.54a : 1.00 g (typ.) sop16-p-300-1.27a : 0.18 g (typ.) tssop16-p-0044-0.65a : 0.06 g (typ.)
tc74act138p/f/ft 2012-02-29 2 pin assignment iec logic symbol truth table inputs outputs enable select g1 a2g b2g c b a 0y 1y 2y 3y 4y 5y 6 y 7 y selected output l x x x x x h h h h h h h h none x h x x x x h h h h h h h h none x x h x x x h h h h h h h h none h l l l l l l h h h h h h h 0 y h l l l l h h l h h h h h h 1 y h l l l h l h h l h h h h h 2 y h l l l h h h h h l h h h h 3 y h l l h l l h h h h l h h h 4 y h l l h l h h h h h h l h h 5 y h l l h h l h h h h h h l h 6 y h l l h h h h h h h h h h l 7 y x: don?t care v cc 16 0y 15 14 13 12 11 10 1 2 3 4 5 6 7 2bg g1 7y gnd 8 9 (top view) b c a 1y 2y 3y 4y 5y 6y 2a g 7 en (1) (3) (2) b & c (6) g1 (15) (13) (11) (14) (12) (10) 2ag (4) (5) (9) (7) a bin/oct 0y 1y 2y 3y 4y 5y 6y 7y 1 2 4 0 1 2 3 4 5 6 2bg 7 (1) (3) (2) b & c (6) g1 (15) (13) (11) (14) (12) (10) 2ag (4) (5) (9) (7) a 0y 1y 2y 3y 4y 5y 6y 7y 0 2 0 1 2 3 4 5 6 2bg 7 0 g dmux
tc74act138p/f/ft 2012-02-29 3 logic diagram absolute maximum ratings (note 1) characteristics symbol rating unit supply voltage range v cc ? 0.5 to 7.0 v dc input voltage v in ? 0.5 to v cc + 0.5 v dc output voltage v out ? 0.5 to v cc + 0.5 v input diode current i ik 20 ma output diode current i ok 50 ma dc output current i out 50 ma dc v cc /ground current i cc 200 ma power dissipation p d 500 (dip) (note 2)/180 (sop/tssop) mw storage temperature t stg ? 65 to 150 c note 1: exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in ic performance or even destruction. using continuously under heavy loads (e.g. the app lication of high temperature/current/voltage and the significant change in temperature, etc.) may cause this product to decrease in the reliability significantly even if the operating conditions (i.e. operating temper ature/current/voltage, etc. ) are within the absolute maximum ratings and the operating ranges. please design the appropriate reliability upon reviewing the toshiba semiconductor reliability handbook (?handling precautions?/?derating concept and methods?) and individual reliability data (i.e. reliability test report and estimated failure rate, etc). note 2: 500 mw in the range of ta = ? 40 to 65c. from ta = 65 to 85c a derating factor of ? 10 mw/c should be applied up to 300 mw. operating ranges (note) characteristics symbol rating unit supply voltage v cc 4.5 to 5.5 v input voltage v in 0 to v cc v output voltage v out 0 to v cc v operating temperature t opr ? 40 to 85 c input rise and fall time dt/dv 0 to 10 ns/v note: the operating ranges must be maintained to ensure the normal oper ation of the device. unused inputs must be tied to either vcc or gnd. a b c 1 2 3 4 5 6 select inputs enable inputs a2g b2g g1 15 data outputs 14 1y 13 2y 12 11 4y 10 9 7 7y 0 y 3 y 5 y 6 y
tc74act138p/f/ft 2012-02-29 4 electrical characteristics dc characteristics test condition ta = 25c ta = ? 40 to 85c characteristics symbol v cc (v) min typ. max min max unit high-level input voltage v ih D 4.5 to 5.5 2.0 D D 2.0 D v low-level input voltage v il D 4.5 to 5.5 D D 0.8 D 0.8 v high-level output voltage v oh v in = v ih or v il i oh = ? 50 a i oh = ? 24 ma i oh = ? 75 ma (note) 4.5 4.5 5.5 4.4 3.94 D 4.5 D D D D D 4.4 3.80 3.85 D D D v low-level output voltage v ol v in = v ih or v il i ol = 50 a i ol = 24 ma i ol = 75 ma (note) 4.5 4.5 5.5 D D D 0.0 D D 0.1 0.36 D D D D 0.1 0.44 1.65 v input leakage current i in v in = v cc or gnd 5.5 D D 0.1 D 1.0 a i cc v in = v cc or gnd 5.5 D D 8.0 D 80.0 a quiescent supply current i c per input: v in = 3.4 v other input: v cc or gnd 5.5 D D 1.35 D 1.5 ma note: this spec indicates the capability of driving 50 ? transmission lines. one output should be tested at a ti me for a 10 ms maximum duration. ac characteristics (c l = 50 pf, r l = 500 ?, input: t r = t f = 3 ns) test condition ta = 25c ta = ? 40 to 85c characteristics symbol v cc (v) min typ. max min max unit propagation delay time (a, b, c- y) t plh t phl D 5.0 0.5 D 6.7 10.1 1.0 11.5 ns propagation delay time (g1- y) t plh t phl D 5.0 0.5 D 6.8 10.5 1.0 12.0 ns propagation delay time ( 2 g- y) t plh t phl D 5.0 0.5 D 6.9 11.0 1.0 12.5 ns input capacitance c in D D 5 10 D 10 pf power dissipation capacitance c pd (note) D 55 D D D pf note: c pd is defined as the value of the internal equivalent capacitance which is ca lculated from the operating current consumption without load. average operating current can be obtained by the equation: i cc (opr) = c pd v cc f in + i cc
tc74act138p/f/ft 2012-02-29 5 package dimensions weight: 1.00 g (typ.)
tc74act138p/f/ft 2012-02-29 6 package dimensions weight: 0.18 g (typ.)
tc74act138p/f/ft 2012-02-29 7 package dimensions weight: 0.06 g (typ.)
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