unisonic technologies co., ltd U74AC240 cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2011 unisonic technologies co., ltd qw-r502-675.a octal buffers/drivers with 3-state outputs ? description the U74AC240 is a octal buffers/driver s with 3-state outputs. it is organized as two 4-bit buffers/drivers with separate output-enable ( oe ) inputs. when oe is high, the y outputs are in a high-impedance state, and the outputs neither load nor drive the bus lines. when oe is low, the device passes inverted data from the a inputs to the y outputs. the U74AC240 is designed to improve the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. to ensure the high-impedance st ate during power up or power down, oe should be tied to v cc through a pull-up resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. ? features * wide supply voltage range from 2v to 6v * max t pd of 6.5 ns from a to y at 5v * low power consumption, i cc = 4 a (max.) at 5.5v * 24ma output driver at 5.5v ? ordering information ordering number package packing lead free halogen free U74AC240l-p20-r U74AC240g-p20-r tssop-20 tape reel U74AC240l-p20-t U74AC240g-p20-t tssop-20 tube
U74AC240 cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-675.a ? pin configuration 1 2 3 4 5 6 7 17 16 15 14 13 12 11 gnd v cc 1oe 2y4 1a2 2y3 1a3 1y2 2a3 1y3 2a2 1y4 2a1 8 9 10 1a4 2y1 2y2 20 19 18 1y1 2a4 1a1 2oe ? function table inputs output oe a y l l h h l x l h z ? logic diagram 1 1a1 2 18 4 16 6 14 8 12 1oe 1a2 1a3 1a4 1y1 1y2 1y3 1y4 19 2a1 11 9 13 7 15 5 17 3 2oe 2a2 2a3 2a4 2y1 2y2 2y3 2y4
U74AC240 cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-675.a ? absolute maximum rating (unless otherwise specified) parameter symbol ratings unit supply voltage v cc -0.5~7 v input voltage v in -0.5~ v cc +0.5 v output voltage v out -0.5~ v cc +0.5 v input clamp current (v in <0, or v in >v cc ) i ik 20 ma output clamp current (v out <0, or v out >v cc ) i ok 20 ma output current i out 50 ma v cc or gnd current i cc 200 ma storage temperature t stg -65 ~ +150 c note: 1. the input and output voltage ratings may be exceeded if the input and output curr ent ratings are observed. 2. absolute maximum ratings are those values be yond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? thermal data parameter symbol ratings unit junction to ambient ja 90 c/w ? recommended operating comditions parameter symbol conditions min typ max unit supply voltage v cc 2 6 v high-level input voltage v ih v cc = 3v 2.1 v v cc = 4.5v 3.15 v cc = 5.5v 3.85 low-level input voltage v il v cc = 3v 0.9 v v cc = 4.5v 1.35 v cc = 5.5v 1.65 input voltage v in 0 v cc v output voltage v out 0 v cc v high-level output current i oh v cc =3v -12 ma v cc =4.5v -24 v cc =5.5v -24 low-level output current i ol v cc =3v 12 ma v cc =4.5v 24 v cc =5.5v 24 input transition rise or fall rate t/ v 8 ns/v operating temperature t a -40 85 c
U74AC240 cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-675.a ? electrical characteristics ( t a =25 c , unless otherwise specified) parameter symbol test conditions min typ max unit high-level output voltage v oh i oh = -50 a, v cc = 3v 2.9 v i oh = -50 a, v cc = 4.5v 4.4 i oh = -50 a, v cc = 5.5v 5.4 i oh = -12ma, v cc = 3v 2.56 i oh = -24ma, v cc = 4.5v 3.86 i oh = -24ma, v cc = 5.5v 4.86 low-level output voltage v ol i ol = 50 a, v cc = 3v 0.1 v i ol = 50 a, v cc = 4.5v 0.1 i ol = 50 a, v cc = 5.5v 0.1 i ol = 12ma, v cc = 3v 0.36 i ol = 24ma, v cc = 4.5v 0.36 i ol = 24ma, v cc = 5.5v 0.36 input leakage current (a or oe inputs) i i(leak) v in = v cc or gnd, v cc = 5.5v 0.1 a high-impedance state current i oz v o = v cc or gnd, v cc = 5.5v v i ( oe ) = v il or v ih 0.25 a quiescent supply current i cc v in = v cc or gnd, i out = 0, v cc = 5.5v 4 a input capacitance c in v in = v cc or gnd, v cc =5v 2.5 pf ? switching characteristics (t a =25c) parameter symbol test conditions min typ max unit propagation delay from input a to output y, t pd t plh v cc =3.30.3v, c l =50pf, r l =500 ? 1.5 6 8 ns v cc =50.5v, c l =50pf, r l =500 ? 1.5 4.5 6.5 t phl v cc =3.30.3v, c l =50pf, r l =500 ? 1.5 5.5 8 ns v cc =50.5v, c l =50pf, r l =500 ? 1.5 4.5 6 propagation delay from input oe to output y, t en t pzh v cc =3.30.3v, c l =50pf, r l =500 ? 1.5 6 10.5 ns v cc =50.5v, c l =50pf, r l =500 ? 1.5 5 7 t pzl v cc =3.30.3v, c l =50pf, r l =500 ? 1.5 7 10 ns v cc =50.5v, c l =50pf, r l =500 ? 1.5 5.5 8 propagation delay from input oe to output y, t dis t phz v cc =3.30.3v, c l =50pf, r l =500 ? 1.5 7 10 ns v cc =50.5v, c l =50pf, r l =500 ? 2.5 6.5 9 t plz v cc =3.30.3v, c l =50pf, r l =500 ? 1.5 7.5 10.5 ns v cc =50.5v, c l =50pf, r l =500 ? 2 6.5 9 ? operating characteristics ( t a =25 c ) parameter symbol test conditions typ unit power dissipation capacitance per buffer/driver c pd v cc = 5v, f=1mhz, c l =50pf 45 pf
U74AC240 cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-675.a ? test circuit and waveforms test s1 t plh /t phl open t plz /t pzl v load t phz /t pzh open v cc inputs v m v load c l r l v v in t r , t f 3.3v0.3v v cc 2.5ns v cc /2 2*v cc 50pf 500 ? 0.3v 5v0.5v v cc 2.5ns v cc /2 2*v cc 50pf 500 ? 0.5v v m v m v m v m v in 0v v oh v ol voltage waveforms propagation delay times input output t plh t phl t plh t phl v oh v ol output v m v m
U74AC240 cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-675.a ? test circuit and waveforms(cont.) v m v m v m v in 0v v oh input output t pzh t phz t plz t pzl v load /2 v ol output v m s1 at open s1 at v load voltage waveforms enable and disable times 0v - notes: 1. c l includes probe and jig capacitance. 2. all input pulses are supplied by generator s having the following characteristics: prr 1mhz, z o = 50 ? . utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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