scas062a ? july 1987 ? revised april 1993 copyright ? 1993, texas instruments incorporated 1 post office box 655303 ? dallas, texas 75265 post office box 1443 ? houston, texas 77251?1443 ? flow-through architecture optimizes pcb layout ? center-pin v cc and gnd configurations minimize high-speed switching noise ? epic ? (enhanced-performance implanted cmos) 1- m process ? 500-ma typical latch-up immunity at 125 c ? package options include plastic small-outline packages, and standard plastic 300-mil dips description this octal bus transceiver is designed for asynchronous communication between data buses. the control function implementation allows for maximum flexibility in timing. these devices transmit data from the a bus to the b bus or from the b bus to the a bus depending upon the level at the output-enable (oeab or oeba ) inputs. the output-enable inputs can be used to disable the device so that the buses are effectively isolated. the dual-enable configuration gives these devices the capability to store data by simultaneous enabling of oeab and oeba . each output reinforces its input in this transceiver configuration. thus, when both control inputs are enabled and all other data sources to the two sets of bus lines are at high impedance, both sets of bus lines (16 in all) will remain at their last states. the 8-bit codes appearing on the two sets of buses will be complementary for the 74ac11620. the 74ac11620 is characterized for operation from ? 40 c to 85 c. function table inputs operation oeba oeab operation l l b data to a bus h ha data to b bus h l isolation l h b data to a bus, a data to b bus dw or nt package (top view) 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 a1 a2 a3 a4 gnd gnd gnd gnd a5 a6 a7 a8 oeab b1 b2 b3 b4 v cc v cc b5 b6 b7 b8 oeba epic is a trademark of texas instruments incorporated.
scas062a ? july 1987 ? revised april 1993 2 post office box 655303 ? dallas, texas 75265 post office box 1443 ? houston, texas 77251?1443 logic symbol ? logic diagram (positive logic) 2 a1 b1 en2 24 oeab 1 a1 2 a2 b1 23 3 a3 4 a4 9 a5 10 a6 11 a7 12 a8 b2 22 b3 21 b5 17 b4 20 b6 16 b8 14 b7 15 oeba 1 13 24 23 1 en1 13 oeba oeab to 7 other channels ? this symbol is in accordance with ansi/ieee std 91-1984 and iec publication 617-12. absolute maximum ratings over operating free-air temperature range (unless otherwise noted) ? supply voltage range, v cc ?0.5 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input voltage range, v i (see note 1) ?0.5 v to v cc + 0.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output voltage range, v o (see note 1) ?0.5 v to v cc + 0.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input clamp current, i ik (v i < 0 or v i > v cc ) 20 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output clamp current, i ok (v o < 0 or v o > v cc ) 50 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous output current, i o (v o = 0 to v cc ) 50 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous current through v cc or gnd pins 200 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range ? 65 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ? stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, a nd functional operation of the device at these or any other conditions beyond those indicated under ?recommended operating conditi ons? is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. note 1: the input and output voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
scas062a ? july 1987 ? revised april 1993 3 post office box 655303 ? dallas, texas 75265 post office box 1443 ? houston, texas 77251?1443 recommended operating conditions min nom max unit v cc supply voltage 3 5 5.5 v v cc = 3 v 2.1 v ih high-level input voltage v cc = 4.5 v 3.15 v v ih high-level input voltage v cc = 5.5 v 3.85 v v cc = 3 v 0.9 v il low-level input voltage v cc = 4.5 v 1.35 v v il low-level input voltage v cc = 5.5 v 1.65 v v i input voltage 0 v cc v v o output voltage 0 v cc v v cc = 3 v ?4 i oh high-level output current v cc = 4.5 v ?24 ma i oh high-level output current v cc = 5.5 v ?24 ma v cc = 3 v 12 i ol low-level output current v cc = 4.5 v 24 ma i ol low-level output current v cc = 5.5 v 24 ma ? t/ ? v input transition rise or fall rate oeba or oeab 0 5 ns/v ? t/ ? v input transition rise or fall rate a or b 0 10 ns/v t a operating free-air temperature ?40 85 c
scas062a ? july 1987 ? revised april 1993 4 post office box 655303 ? dallas, texas 75265 post office box 1443 ? houston, texas 77251?1443 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) parameter test conditions v cc t a = 25 c min max unit parameter test conditions v cc min typ max min max unit 3 v 2.9 2.9 i oh = ? 50 a 4.5 v 4.4 4.4 i oh = ? 50 a 5.5 v 5.4 5.4 v oh i oh = ? 4 ma 3 v 2.58 2.48 v v oh i oh = ? 24 ma 4.5 v 3.94 3.8 v i oh = ? 24 ma 5.5 v 4.94 4.8 i oh = ? 75 ma ? 5.5 v 3.85 3 v 0.1 0.1 i ol = 50 a 4.5 v 0.1 0.1 i ol = 50 a 5.5 v 0.1 0.1 v ol i ol = 12 ma 3 v 0.36 0.44 v v ol i ol = 24 ma 4.5 v 0.36 0.44 v i ol = 24 ma 5.5 v 0.36 0.44 i ol = 75 ma ? 5.5 v 1.65 i i oeba or oeab v i = v cc or gnd 5.5 v 0.1 1 a i oz ? a or b ports v o = v cc or gnd 5.5 v 0.5 5 a i cc v i = v cc or gnd, i o = 0 5.5 v 8 80 a c i oeba or oeab v i = v cc or gnd 5 v 4 pf c io a or b ports v o = v cc or gnd 5 v 12 pf ? not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms. ? for i/o ports, the parameter i oz includes the input leakage current. switching characteristics over recommended operating free-air temperature range, v cc = 3.3 v 0.3 v (unless otherwise noted) (see figure 1) parameter from to t a = 25 c min max unit parameter from (input) to (output) min typ max min max unit t plh a or b b or a 1.5 6.8 9 1.5 10.2 ns t phl a or b b or a 1.5 6.5 8.2 1.5 9.1 ns t pzh oeba a 1.5 8 10.3 1.5 11.7 ns t pzl oeba a 1.5 7.3 9.8 1.5 10.9 ns t phz oeba a 1.5 6.7 8.4 1.5 9 ns t plz oeba a 1.5 7.8 9.6 1.5 10.4 ns t pzh oeab b 1.5 8.4 10 1.5 11.5 ns t pzl oeab b 1.5 8.1 10.1 1.5 11.3 ns t phz oeab b 1.5 7 8.7 1.5 9.4 ns t plz oeab b 1.5 7.7 9.6 1.5 10.4 ns
scas062a ? july 1987 ? revised april 1993 5 post office box 655303 ? dallas, texas 75265 post office box 1443 ? houston, texas 77251?1443 switching characteristics over recommended operating free-air temperature range, v cc = 5 v 0.5 v (unless otherwise noted) (see figure 1) parameter from to t a = 25 c min max unit parameter from (input) to (output) min typ max min max unit t plh a or b b or a 1.5 5.2 6.6 1.5 7.4 ns t phl a or b b or a 1.5 4.8 6.3 1.5 7.1 ns t pzh oeba a 1.5 6 7.8 1.5 8.9 ns t pzl oeba a 1.5 5.5 7.6 1.5 8.5 ns t phz oeba a 1.5 5.9 7.5 1.5 8.1 ns t plz oeba a 1.5 6.3 8.1 1.5 8.7 ns t pzh oeab b 1.5 6.2 7.7 1.5 8.8 ns t pzl oeab b 1.5 6 7.8 1.5 8.8 ns t phz oeab b 1.5 6.1 7.7 1.5 8.2 ns t plz oeab b 1.5 6.2 7.9 1.5 8.6 ns operating characteristics, v cc = 5 v, t a = 25 c parameter test conditions typ unit c pd power dissipation capacitance per transceiver outputs enabled c l = 50 pf, f = 1 mhz 54 pf c pd power dissipation capacitance per transceiver outputs disabled c l = 50 pf, f = 1 mhz 11 pf
scas062a ? july 1987 ? revised april 1993 6 post office box 655303 ? dallas, texas 75265 post office box 1443 ? houston, texas 77251?1443 parameter measurement information from output under test c l = 50 pf load circuit for outputs s1 2 v cc open gnd 500 ? 500 ? test t plh /t phl t plz /t pzl t phz /t pzh s1 open 2 v cc gnd output control (low-level enabling) output waveform 1 s1 at 2 v cc (see note c) output waveform 2 s1 at gnd (see note c) v ol v oh t pzl t pzh t plz t phz 50% 50% v c c 0 v 50% v cc 0 v v cc (see note a) 50% v cc 20% v cc 80% v cc t plh t phl 50% 50% 0 v 50% v cc 50% v cc v oh v ol input (see note b) output (see note d) voltage waveforms propagation delay times voltage waveforms enable and disable times v cc notes: a. c l includes probe and jig capacitance. b. all input pulses are supplied by generators having the following characteristics: prr 10 mhz, z o = 50 ? , t r 3 ns, t f 3 ns. for testing pulse duration: t r = t f = 1 to 3 ns. pulse polarity can be either high-to-low-to-high or low-to-high-to-low. c. waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. d. the outputs are measured one at a time with one transition per measurement. figure 1. load circuit and voltage waveforms
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