? 2005 fairchild semiconductor corporation ds009944 www.fairchildsemi.com november 1988 revised march 2005 74ac245 ? 74act245 octal bidirectional transceiver with 3-state 74ac245 74act245 octal bidirectional transceiver with 3-state inputs/outputs general description the ac/act245 contains eight non-inverting bidirectional buffers with 3-state outputs and is intended for bus-ori- ented applications. current sinking capability is 24 ma at both the a and b ports. the transmit/receive (t/r ) input determines the direction of data flow through the bidirec- tional transceiver. transmit (active-high) enables data from a ports to b ports; receive (active-low) enables data from b ports to a ports. the output enable input, when high, disables both a and b ports by placing them in a high z condition. features i cc and i oz reduced by 50% non-inverting buffers bidirectional data path a and b outputs source/sink 24 ma act245 has ttl-compatible inputs ordering code: device also available in tape and reel. specify by appending suffix letter ?x? to the ordering code. pb-free package per jedec j-std-020b. note 1: ?_nl? indicates pb-free package (per jedec j-std-020b). device available in tape and reel only. fact is a trademark of fairchild semiconductor corporation. order number package package description number 74ac245sc m20b 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide 74ac245sj m20d pb-free 20-lead small outline package (sop), eiaj type ii, 5.3mm wide 74ac245mtc mtc20 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide 74ac245pc n20a 20-lead plastic dual-in-line package (pdip), jedec ms-001, 0.300" wide 74act245sc m20b 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide 74act245scx_nl (note 1) m20b pb-free 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide 74act245sj m20d pb-free 20-lead small outline package (sop), eiaj type ii, 5.3mm wide 74act245msa msa20 20-lead shrink small outline package (ssop), jedec mo-150, 5.3mm wide 74act245mtc mtc20 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide 74act245mtcx_nl (note 1) mtc20 pb-free 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide 74act245pc n20a 20-lead plastic dual-in-line package (pdip), jedec ms-001, 0.300" wide
www.fairchildsemi.com 2 74ac245 74act245 connection diagram logic symbols ieee/iec pin descriptions truth table h high voltage level l low voltage level x immaterial pin description names oe output enable input t/r transmit/receive input a 0 ? a 7 side a 3-state inputs or 3-state outputs b 0 ? b 7 side b 3-state inputs or 3-state outputs inputs outputs oe t/r l l bus b data to bus a l h bus a data to bus b hxhigh-z state
3 www.fairchildsemi.com 74ac245 74act245 absolute maximum ratings (note 2) recommended operating conditions note 2: absolute maximum ratings are those values beyond which damage to the device may occur. the databook specifications should be met, with- out exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. fairchild does not recommend operation of fact circuits outside databook specifications. dc electrical characteristics for ac note 3: all outputs loaded; thresholds on input associated with output under test. note 4: maximum test duration 2.0 ms, one output loaded at a time. note 5: i in and i cc @ 3.0v are guaranteed to be less than or equal to the respective limit @ 5.5v v cc . supply voltage (v cc ) 0.5v to 7.0v dc input diode current (i ik ) v i 0.5v 20 ma v i v cc 0.5v 20 ma dc input voltage (v i ) 0.5v to v cc 0.5v dc output diode current (i ok ) v o 0.5v 20 ma v o v cc 0.5v 20 ma dc output voltage (v o ) 0.5v to v cc 0.5v dc output source or sink current (i o ) r 50 ma dc v cc or ground current per output pin (i cc or i gnd ) r 50 ma storage temperature (t stg ) 65 q c to 150 q c junction temperature (t j ) pdip 140 q c supply voltage (v cc ) ac 2.0v to 6.0v act 4.5v to 5.5v input voltage (v i )0v to v cc output voltage (v o )0v to v cc operating temperature (t a ) 40 q c to 85 q c minimum input edge rate ( ' v/ ' t) ac devices v in from 30% to 70% of v cc v cc @ 3.3v, 4.5v, 5.5v 125 mv/ns minimum input edge rate ( ' v/ ' t) act devices v in from 0.8v to 2.0v v cc @ 4.5v, 5.5v 125 mv/ns symbol parameter v cc t a 25 q ct a 40 q c to 85 q c units conditions (v) typ guaranteed limits v ih minimum high level 3.0 1.5 2.1 2.1 v out 0.1v input voltage 4.5 2.25 3.15 3.15 v or v cc 0.1v 5.5 2.75 3.85 3.85 v il maximum low level 3.0 1.5 0.9 0.9 v out 0.1v input voltage 4.5 2.25 1.35 1.35 v or v cc 0.1v 5.5 2.75 1.65 1.65 v oh minimum high level 3.0 2.99 2.9 2.9 output voltage 4.5 4.49 4.4 4.4 v i out 50 p a 5.5 5.49 5.4 5.4 v in v il or v ih 3.0 2.56 2.46 i oh 12 ma 4.5 3.86 3.76 v i oh 24 ma 5.5 4.86 4.76 i oh 24 ma (note 3) v ol maximum low level 3.0 0.002 0.1 0.1 output voltage 4.5 0.001 0.1 0.1 v i out 50 p a 5.5 0.001 0.1 0.1 v in v il or v ih 3.0 0.36 0.44 i ol 12 ma 4.5 0.36 0.44 v i ol 24 ma 5.5 0.36 0.44 i ol 24 ma (note 3) i in (note 5) maximum input leakage current 5.5 r 0.1 r 1.0 p av i v cc , gnd i old dynamic output 5.5 75 ma v old 1.65v max i ohd current minimum (note 4) 5.5 75 ma v ohd 3.85v min i cc (note 5) maximum quiescent supply current 5.5 4.0 40.0 p av in v cc or gnd i ozt maximum i/o v i (oe) v il , v ih leakage current 5.5 r 0.3 r 3.0 p av i v cc , gnd v o v cc , gnd
www.fairchildsemi.com 4 74ac245 74act245 dc characteristics for act note 6: all outputs loaded; thresholds on input associated with output under test. note 7: maximum test duration 2.0 ms, one output loaded at a time. ac electrical characteristics for ac note 8: voltage range 3.3 is 3.3v r 0.3v voltage range 5.0 is 5.0v r 0.5v symbol parameter v cc t a 25 q ct a 40 q c to 85 q c units conditions (v) typ guaranteed limits v ih minimum high level 4.5 1.5 2.0 2.0 v v out 0.1v input voltage 5.5 1.5 2.0 2.0 or v cc 0.1v v il maximum low level 4.5 1.5 0.8 0.8 v v out 0.1v input voltage 5.5 1.5 0.8 0.8 or v cc 0.1v v oh minimum high level 4.5 4.49 4.4 4.4 v i out 50 p a output voltage 5.5 5.49 5.4 5.4 v in v il or v ih 4.5 3.86 3.76 i oh 24 ma 5.5 4.86 4.76 v i oh 24 ma (note 6) v ol maximum low level 4.5 0.001 0.1 0.1 v i out 50 p a output voltage 5.5 0.001 0.1 0.1 v in v il or v ih 4.5 0.36 0.44 v i ol 24 ma 5.5 0.36 0.44 i ol 24 ma (note 6) i in maximum input 5.5 r 0.1 r 1.0 p av i v cc , gnd leakage current i cct maximum 5.5 0.6 1.5 ma v i v cc 2.1v i cc /input i old dynamic output 5.5 75 ma v old 1.65v max i ohd current minimum (note 7) 5.5 75 ma v ohd 3.85v min i cc maximum quiescent 5.5 4.0 40.0 p a v in v cc supply current or gnd i ozt maximum i/o v i (oe) v il , v ih leakage current 5.5 r 0.3 r 3.0 p av i v cc , gnd v o v cc , gnd v cc t a 25 q ct a 40 q c to 85 q c symbol parameter (v) c l 50 pf c l 50 pf units (note 8) min typ max min max t plh propagation delay 3.3 1.5 5.0 8.5 1.0 9.0 ns a n to b n or b n to a n 5.0 1.5 3.5 6.5 1.0 7.0 t phl propagation delay 3.3 1.5 5.0 8.5 1.0 9.0 ns a n to b n or b n to a n 5.0 1.5 3.5 6.0 1.0 7.0 t pzh output enable time 3.3 2.5 7.0 11.5 2.0 12.5 ns 5.0 1.5 5.0 8.5 1.0 9.0 t pzl output enable time 3.3 2.5 7.5 12.0 2.0 13.5 ns 5.0 1.5 5.5 9.0 1.0 9.5 t phz output disable time 3.3 2.0 6.5 12.0 1.0 12.5 ns 5.0 1.5 5.5 9.0 1.0 10.0 t plz output disable time 3.3 2.0 7.0 11.5 1.5 13.0 ns 5.0 1.5 5.5 9.0 1.0 10.0
5 www.fairchildsemi.com 74ac245 74act245 ac electrical characteristics for act note 9: voltage range 5.0 is 5.0v r 0.5v capacitance v cc t a 25 q ct a 40 q c to 85 q c symbol parameter (v) c l 50 pf c l 50 pf units (note 9) min typ max min max t plh propagation delay 5.0 1.5 4.0 7.5 1.5 8.0 ns a n to b n or b n to a n t phl propagation delay 5.0 1.5 4.0 8.0 1.0 9.0 ns a n to b n or b n to a n t pzh output enable time 5.0 1.5 5.0 10.0 1.5 11.0 ns t pzl output enable time 5.0 1.5 5.5 10.0 1.5 12.0 ns t phz output disable time 5.0 1.5 5.5 10.0 1.0 11.0 ns t plz output disable time 5.0 2.0 5.0 10.0 1.5 11.0 ns symbol parameter typ units conditions c in input capacitance 4.5 pf v cc open c i/o input/output capacitance 15.0 pf v cc 5.0v c pd power dissipation capacitance 45.0 pf v cc 5.0v
www.fairchildsemi.com 6 74ac245 74act245 physical dimensions inches (millimeters) unless otherwise noted 20-lead small outline integrated circuit (soic), jedec ms-013, 0.300" wide package number m20b
7 www.fairchildsemi.com 74ac245 74act245 physical dimensions inches (millimeters) unless otherwise noted (continued) pb-free 20-lead small outline package (sop), eiaj type ii, 5.3mm wide package number m20d
www.fairchildsemi.com 8 74ac245 74act245 physical dimensions inches (millimeters) unless otherwise noted (continued) 20-lead shrink small outline package (ssop), jedec mo-150, 5.3mm wide package number msa20
9 www.fairchildsemi.com 74ac245 74act245 physical dimensions inches (millimeters) unless otherwise noted (continued) 20-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide package number mtc20
www.fairchildsemi.com 10 74ac245 74act245 octal bidirectional transceiver with 3-state physical dimensions inches (millimeters) unless otherwise noted (continued) 20-lead plastic dual-in-line package (pdip), jedec ms-001, 0.300" wide package number n20a fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and fairchild reserves the right at any time without notice to change said circuitry and specifications. life support policy fairchild ? s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be rea- sonably expected to result in a significant injury to the user. 2. a critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com
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