unisonic technologies co., ltd U74HC640 cmos ic www.unisonic.com.tw 1 of 7 copyright ? 2011 unisonic technologies co., ltd qw-r126-008.a octal bus transceivers with 3-state outputs ? description the u74ahc640 is a octal bus transceivers with 3-state outputs. it is designed for asynchronous two-way communication between data buses. depending on the direction-control (dir) input, data are transmitted from the a bus to the b bus or from the b bus to the a bus. when oe is high, the buses are effectively isolated. when oe is low, the buses are enable. ? features * wide supply voltage range from 2v to 6v * typical t pd of 8ns at 6v, c l =50pf * low power consumption, i cc = 8 a (max) at 5.5v * 7.8ma output driver at 6v ? ordering information ordering number package packing lead free halogen free u74ahc640l-r20-r u74ahc640g-r20-r ssop-20 tape reel u74ahc640l-r20-t u74ahc640g-r20-t ssop-20 tube
U74HC640 cmos ic unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r126-008.a ? pin configuration 7 6 5 4 3 2 1 18 17 16 14 15 19 20 dir a1 a2 a6 v cc a4 a3 oe b1 b2 b4 b3 813 a7 b6 a5 b5 912 a8 10 11 gnd b8 b7 ? function table inputs operation oe dir l l h l h x b data to a bus a data to b bus isolation ? logic diagram to seven other transceivers oe dir a1 b1
U74HC640 cmos ic unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r126-008.a ? absolute maximum rating (unless otherwise specified) parameter symbol ratings unit supply voltage v cc -0.5~7 v input voltage v in -0.5~7 v output voltage v out -0.5~v cc +0.5 v input clamp current (v in <0) i ik 20 ma output clamp current (v out <0, or v out >v cc ) i ok 20 ma output current i out 35 ma v cc or gnd current i cc 70 ma storage temperature t stg -65 ~ +150 c note: 1. the input and output voltage ratings may be exceeded if the input and output current ratings are observed. 2. absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device operation is not implied. ? recommended operating comditions parameter symbol conditions min typ max unit supply voltage v cc 2 5 6 v high-level input voltage v ih v cc = 2v 1.5 v v cc = 4.5v 3.15 v cc = 6v 4.2 low-level input voltage v il v cc = 2v 0.5 v v cc = 4.5v 1.35 v cc = 6v 1.8 input voltage v in 0 v cc v output voltage v out 0 v cc v input transition rise or fall rate t/ v v cc = 2v 1000 ns/v v cc = 4.5v 500 v cc = 6v 400 operating temperature t a -40 85 c ? 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 = -20 a, v cc = 2v 1.9 1.998 v i oh = -20 a, v cc = 4.5v 4.4 4.499 i oh = -20 a, v cc = 6v 5.9 5.999 i oh = -6ma, v cc = 4.5v 3.98 4.3 i oh = -7.8ma, v cc = 6v 5.48 5.8 low-level output voltage v ol i ol = 20 a, v cc = 2v 0.002 0.1 v i ol = 20 a, v cc = 4.5v 0.001 0.1 i ol = 20 a, v cc = 6v 0.001 0.1 i ol = 6ma, v cc = 4.5v 0.17 0.26 i ol = 7.8ma, v cc = 6v 0.15 0.26 input leakage current(dir or oe ) i i(leak) v in = v cc or 0, v cc = 6v 0.1 100 a high-impedance state current (a or b) i oz v out = v cc or 0, v cc = 6v 0.01 0.5 a quiescent supply current i cc v in =v cc or 0,i out =0,v cc =6v 8 a input capacitance (dir or oe ) c in v in =v cc or 0,v cc =2v to 6v 3 10 pf
U74HC640 cmos ic unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r126-008.a ? switching characteristics (t a =25c) c l =50pf, r l =1k ? parameter symbol test conditions min typ max unit propagation delay from a to b or b to a t pd v cc =2v 29 105 ns v cc =4.5v 10 21 v cc =6v 8 18 enable times from oe to a or b t en v cc =2v 109 230 ns v cc =4.5v 27 46 v cc =6v 20 39 disable times from oe to a or b t dis v cc =2v 40 150 ns v cc =4.5v 18 30 v cc =6v 16 26 output rise or fall time t t v cc =2v 20 60 ns v cc =4.5v 8 12 v cc =6v 6 10 c l =150pf, r l =1k ? parameter symbol test conditions min typ max unit propagation delay from a to b or b to a t pd v cc =2v 44 190 ns v cc =4.5v 14 38 v cc =6v 11 33 enable times from oe to a or b t en v cc =2v 124 315 ns v cc =4.5v 31 63 v cc =6v 23 54 output rise or fall time t t v cc =2v 45 210 ns v cc =4.5v 17 42 v cc =6v 13 36 ? operating characteristics (t a =25c) parameter symbol test conditions typ unit power dissipation capacitance c pd no load 40 pf
U74HC640 cmos ic unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r126-008.a ? test circuit and waveforms test s1 t plh /t phl open t plz /t pzl v load t phz /t pzh gnd v cc input v m v load c l r l v v in t r , t f 3.3v0.3v v cc 3ns v cc /2 v cc 50pf 1k ? 0.3v 150pf 5v0.5v v cc 3ns v cc /2 v cc 50pf 1k ? 0.5v 150pf v cc 0v input 10% 90% t r 10% 90% t f voltage waveforms input rise and fall times
U74HC640 cmos ic unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r126-008.a ? test circuit and waveforms(cont.) v m v in 0v v oh v ol voltage waveforms propagation delay and output transition times input output t plh t phl t plh t phl v oh v ol output 10% 90% t r 10% 90% t f 10% 90% t f 10% 90% t r v m v m v m v m v m v m v in 0v v oh input output t pzh t phz t plz t pzl v load v ol output s1 at gnd s1 at v load v oh -v voltage waveforms enabl e and disable times 0v v ol +v v m v m v m notes: 1. c l includes probe and jig capacitance. 2. all input pulses are supplied by generators having the following characteristics: p rr 1mhz, z o = 50 ? , t r =6ns, t f =6ns. 3. t plh and t phl are the same as t pd . 4. t plz and t phz are the same as t dis . 5. t pzh and t pzl are the same as t en .
U74HC640 cmos ic unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r126-008.a 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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