unisonic technologies co., ltd U74HCT640 cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2012 unisonic technologies co., ltd qw-r502-684.b octal bus transceivers with 3-state outputs ? description the U74HCT640 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 b bus to the a bus. when oe is high, the buses are effectively isolated. when oe is low, the buses are enable. ? features * inputs are ttl-voltage compatible * typical t pd of 12ns at 5.5v, c l =50pf * low power consumption, i cc = 8 a (max) at 5.5v * 6ma output driver at 4.5v sop-20 ssop-20 tssop-20 ? ordering information ordering number package packing lead free halogen free U74HCT640l-p20-r U74HCT640g-p20-r tssop-20 tape reel U74HCT640l-p20-t U74HCT640g-p20-t tssop-20 tube U74HCT640l-r20-r U74HCT640g-r20-r ssop-20 tape reel U74HCT640l-r20-t U74HCT640g-r20-t ssop-20 tube U74HCT640l-s20-r U74HCT640g-s20-r sop-20 tape reel U74HCT640l-s20-t U74HCT640g-s20-t sop-20 tube
U74HCT640 cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-684.b ? pin configuration ? function table (each buffer) inputs operation oe dir l l h l h x b data to a bus a data to b bus isolation ? logic diagram (positive logic) to seven other transceivers oe dir a1 b1
U74HCT640 cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-684.b ? absolute maximum rating 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 4.5 5 5.5 v high-level input voltage v ih v cc = 4.5v to 5.5v 2 v low-level input voltage v il v cc = 4.5v to 5.5v 0 0.8 v 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 = 4.5v 0 500 ns/v operating temperature t a -40 85 c ? electrical characteristics (t a =25c , unless otherwise specified) parameter symbol test conditions min typ max unit high-level output voltage v oh i oh = -20 a, v cc = 4.5v 4.4 4.499 v i oh = -6ma, v cc = 4.5v 3.98 4.30 low-level output voltage v ol i ol = 20 a, v cc = 4.5v 0.001 0.1 v i ol = 6ma, v cc = 4.5v 0.17 0.26 input leakage current (dir or oe ) i i(leak) v in = v cc or 0, v cc = 5.5v 0.1 100 a high-impedance state current (a or b) i oz v out = v cc or 0, v cc = 5.5v 0.01 0.5 a quiescent supply current i cc v in =v cc or 0, i out = 0, v cc = 5.5v 8 a additional quiescent supply current i cc one input at 0.5v or 2.4v, other inputs at 0v or v cc , v cc =5.5v 1.4 2.4 ma input capacitance (dir or oe ) c in v in = v cc or 0, v cc =4.5v to 5.5v 3 10 pf
U74HCT640 cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-684.b ? switching characteristics (t a =25c) parameter symbol test conditions min typ max unit propagation delay from a to b or b to a t pd v cc =4.5v, c l =50pf, r l =1k ? 14 21 ns v cc =5.5v, c l =50pf, r l =1k ? 12 18 enable times from oe to a or b t en v cc =4.5v, c l =50pf, r l =1k ? 27 35 ns v cc =5.5v, c l =50pf, r l =1k ? 24 32 disable times from oe to a or b t dis v cc =4.5v, c l =50pf, r l =1k ? 20 30 ns v cc =5.5v, c l =50pf, r l =1k ? 18 26 output rise or fall time t t v cc =4.5v, c l =50pf, r l =1k ? 9 12 ns v cc =5.5v, c l =50pf, r l =1k ? 8 11 ? switching characteristics (t a =25c) parameter symbol test conditions min typ max unit propagation delay from a to b or b to a t pd v cc =4.5v, c l =150pf, r l =1k ? 17 27 ns v cc =5.5v, c l =150pf, r l =1k ? 15 24 enable times from oe to a or b t en v cc =4.5v, c l =150pf, r l =1k ? 31 45 ns v cc =5.5v, c l =150pf, r l =1k ? 28 41 output rise or fall time t t v cc =4.5v, c l =150pf, r l =1k ? 17 42 ns v cc =5.5v, c l =150pf, r l =1k ? 14 38 ? operating characteristics (t a =25c) parameter symbol test conditions typ unit power dissipation capacitance c pd no load 40 pf
U74HCT640 cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-684.b ? 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 5v0.5v v cc 6ns v cc /2 v cc 50pf 1k ? 0.5v 150pf v cc 0v input 10% 90% t r 10% 90% t f
U74HCT640 cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-684.b ? test circuit and waveforms(cont.) v m v m v m 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 v m v m 10% 90% t r 10% 90% t f 10% 90% t f 10% 90% t r v m v m v m v in 0 v v oh input output t pzh t phz t plz t pzl v load v ol output v m s1 at gnd s1 at v load voltage waveforms enable and disable times 0v v ol +v v oh +v 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 . 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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