rev.4.00 jul. 27, 2004 page 1 of 6 HD74LVC245A octal bidirectional transceivers with 3-state outputs rej03d0353?0400z (previous ade-205-111b (z)) rev.4.00 jul. 27, 2004 description the HD74LVC245A has eight buffers with three st ate outputs in a 20 pin package. when (t / r ) is high, data flows from the a inputs to the b outputs, and when (t / r ) is low, data flows from the b inputs to the a outputs. a and b bus are separated by making enable input ( oe ) high level. low voltage and high-speed operation is suitable at the battery drive product (note type personal computer) and low power consumption extends the life of a battery for long time operation. features ? v cc = 2.0 v to 5.5 v ? all inputs v ih (max.) = 5.5 v (@v cc = 0 v to 5.5 v) ? all input outputs v i/o (max.) = 5.5 v (@v cc = 0 v or output off state) ? typical v ol ground bounce < 0.8 v (@v cc = 3.3 v, ta = 25c) ? typical v oh undershoot > 2.0 v (@v cc = 3.3 v, ta = 25c) ? high output current 24 ma (@v cc = 3.0 v to 5.5 v) ? ordering information part name package type package code package abbreviation taping abbreviation (quantity) HD74LVC245Afpel sop?20 pin (jeita) fp?20dav fp el (2,000 pcs/reel) HD74LVC245Atell tssop?20 pin ttp?20dav t ell (2,000 pcs/reel) note: please consult the sales office for the above package availability. function table inputs oe t / r operation l l b data to a bus l h a data to b bus hxz h: high level l: low level x: immaterial z: high impedance
HD74LVC245A rev.4.00 jul. 27, 2004 page 2 of 6 pin arrangement (top view) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 v cc gnd a0 a2 a3 a4 a5 a6 a7 t / r b1 b2 b3 b4 b5 b6 b7 oe a1 b0 absolute maximum ratings item symbol ratings unit conditions supply voltage v cc ?0.5 to 6.0 v input diode current i ik ?50 ma v i = ?0.5 v input voltage v i ?0.5 to 6.0 v t / r , oe ?50 v o = ?0.5 v output diode current i ok 50 ma v o = v cc +0.5 v ?0.5 to v cc +0.5 output "h" or "l" input / output voltage v i/o ?0.5 to 6.0 v output "z" or v cc :off output current i o 50 ma v cc , gnd current / pin i cc or i gnd 100 ma storage temperature tstg ?65 to 150 c note: the absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of which may be realized at the same time.
HD74LVC245A rev.4.00 jul. 27, 2004 page 3 of 6 recommended operating conditions item symbol ratings unit conditions 1.5 to 5.5 data retention supply voltage v cc 2.0 to 5.5 v at operation v i 0 to 5.5 v t / r , oe 0 to v cc output "h" or "l" input / output voltage v i/o 0 to 5.5 v output "z" or v cc :off operating temperature ta ?40 to 85 c ?12 v cc = 2.7 v i oh ?24 *2 ma v cc = 3.0 v to 5.5 v 12 v cc = 2.7 v output current i ol 24 *2 ma v cc = 3.0 v to 5.5 v input rise / fall time *1 t r , t f 10 ns/v notes: 1. this item guarantees maximum limit when one input switches. waveform: refer to test circui t of switching characteristics. 2. duty cycle 50% electrical characteristics ta = ?40 to 85c item symbol v cc (v) min max unit test conditions 2.7 to 3.6 2.0 ? v ih 4.5 to 5.5 v cc 0.7 ? v 2.7 to 3.6 ? 0.8 input voltage v il 4.5 to 5.5 ? v cc 0.3 v 2.7 to 5.5 v cc ?0.2 ? i oh = ?100 a 2.7 2.2 ? 3.0 2.4 ? i oh = ?12 ma 3.0 2.2 ? v oh 4.5 3.8 ? v i oh = ?24 ma 2.7 to 5.5 ? 0.2 i ol = 100 a 2.7 ? 0.4 i ol = 12 ma 3.0 ? 0.55 output voltage v ol 4.5 ? 0.55 v i ol = 24 ma input current i in 0 to 5.5 ? 5.0 a v in = 5.5 v or gnd off state output current i oz 2.7 to 5.5 ? 5.0 a v in = v cc , gnd, v out = 5.5 v or gnd output leak current i off 0 ? 20 a v in / v out = 5.5 v 2.7 to 3.6 ? 10 v in / v out = 3.6 to 5.5 v i cc 2.7 to 5.5 ? 10 a v in = v out or gnd quiescent supply current ? i cc 3.0 to 3.6 ? 500 a v in = one input at (v cc ?0.6)v, other inputs at v cc or gnd
HD74LVC245A rev.4.00 jul. 27, 2004 page 4 of 6 switching characteristics ta = ?40 to 85c item symbol v cc (v) min typ max unit from (input) to (output) 2.7 ??8.0 3.30.3 1.5 ? 7.0 propagation delay time t plh t phl 5.00.5 ? ? 5.5 ns a or b b or a 2.7 ??9.5 3.30.3 1.5 ? 8.5 output enable time t zh t zl 5.00.5 ? ? 7.0 ns oe a or b 2.7 ??8.5 3.30.3 1.5 ? 7.5 output disable time t zh t lz 5.00.5 ? ? 6.5 ns oe a or b 2.7 ??? 3.30.3 ? ? 1.0 between output pins skew *1 t oslh t oshl 5.00.5 ? ? 1.0 ns input capacitance c in 2.7 ? 3.0 ? pf output capacitance c o 2.7 ? 15.0 ? pf note: 1. this parameter is c haracterized but not tested. tos lh = | t plhm - t plhn |, tos hl = | t phlm - t phln | test circuit v cc see function table a0 open *1 see under table c = 50 pf oe t / r b0 pulse generator z out = 50 input s1 500 gnd output v cc 450 50 scope s2 l symbol s2 t / t plh phl open gnd 6 v t / t zh hz t / t zl lz open gnd 2vcc vcc=2.7v, 3.30.3v vcc=5.00.5v note: 1. c l includes probe and jig capacitance.
HD74LVC245A rev.4.00 jul. 27, 2004 page 5 of 6 waveforms ? 1 t plh t phl v oh v ol input 10 % gnd 90 % t r t f 90 % 10 % in phase output v ih v ref v ref v ref v ref waveforms ? 2 v ? 0.3 v oh v + 0.3 v ol t zl t lz t zh t hz t f t r 90 % 10 % 90 % 10 % v oh v ol gnd waveform - a oe waveform - b v ref v ref v ref v ref v ih v ol1 v oh1 test v ih v ref v oh1 v ol1 1.5 v 3 v gnd 50%vcc 2.7 v vcc vcc gnd vcc=2.7v, 3.30.3v vcc=5.00.5v notes: 1. t r = 2.5 ns, t f = 2.5 ns 2. input waveform : prr = 10 mhz, duty cycle 50% 3. waveform ? a shows input conditions such that the output is "l" level when enable by the output control. 4. waveform ? b shows input conditions such t hat the output is "h" level when enable by the output control.
HD74LVC245A rev.4.00 jul. 27, 2004 page 6 of 6 package dimensions package code jedec jeita mass (reference value) fp?20dav ? conforms 0.31 g *pd plating *0.40 0.06 0.12 0.15 m 20 10 1 *0.20 0.05 0.80 max 11 12.6 5.5 2.20 max 13 max 0 ? ? 8 ? 0.70 0.20 + 0.20 ? 0.30 7.80 1.27 0.10 0.10 1.15 as of january, 2002 unit: mm package code jedec jeita mass (reference value) ttp?20dav ? ? 0.07 g *pd plating 0.50 0.10 0? ? 8? *0.15 0.05 6.40 0.20 0.10 1.10 max 0.13 m 0.65 110 20 11 4.40 6.50 6.80 max *0.20 0.05 0.07 +0.03 ?0.04 1.0 0.65 max as of january, 2002 unit: mm
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