unisonic technologies co., ltd u74ahct373 cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2011 unisonic technologies co., ltd qw-r502-685.a octal transparent d-type latches with 3-state outputs ? description the u74ahct373 is an octal transparent d-type latch with 3-state outputs and 8 channels. when the oe input is low and the le input is high, the q outputs follow the d inputs. when oe is low and le is low, the q outputs are latched at the logi c levels of the d inputs. when the oe input is high, the outputs are in the high-impedance. the oe does not affect the internal operations of the latches. old data can be retained or new data can be entered while the outputs are in t he high-impedance state. 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 * inputs are ttl-voltage compatible * operate from 4.5v to 5.5v * inputs accept voltages to 5.5v * max t pd of 8.5ns at v cc =5v, c l =15pf tssop-20 ? ordering information ordering number package packing lead free halogen free u74ahct373l-p20-r U74AHCT373G-P20-R tssop-20 tape reel u74ahct373l-p20-t u74ahct373g-p20-t tssop-20 tube
u74ahct373 cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-685.a ? pin configuration 9 8 7 6 5 4 3 2 1 18 17 16 14 15 13 12 11 10 19 20 oe 1q 1d 2d 2q 3q 3d 4d 4q gnd le v cc 8q 7d 6q 6d 5d 5q 7q 8d ? function table inputs( oe ) inputs(le) inputs(d) output(q) l h h h l h l l l l x q 0 h x x z note: h: high voltage level; l: low voltage level. ? logic symbol ? logic diagram
u74ahct373 cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-685.a ? absolute maximum rating parameter symbol ratings unit supply voltage range v cc -0.5 ~ 7 v input voltage range (note 3) v i -0.5 ~ 7 v output voltage range (note 3) v o -0.5 ~ v cc +0.5 v input clamp current i ik -20 ma output clamp current i ok 20 ma output current i o 25 ma v cc or gnd current i cc 75 ma storage temperature t stg -65 ~ +150 note: 1. absolute maximum ratings are those values beyond which the device could be permanently damaged. 2. absolute maximum ratings are stress ratings only and functional device operation is not implied. 3. the input and output voltage ratings may be exceeded if the input and output curr ent ratings are observed. ? recommended operating conditions parameter symbol min typ max unit supply voltage v cc 4.5 5.5 v high-level input voltage v ih 2 v low-level input voltage v il 0.8 v input voltage v in 0 5.5 v output voltage v out 0 v cc v high-level output current i oh -8 ma low-level output current i ol 8 ma input rise or fall times t r , t f 20 ns/v operating free-air temperature t a -40 85 ? electrical characteristics (t a =25c) parameter symbol test conditions min typ max unit output voltage high-level v oh v cc =4.5v, i oh =-50 a 4.4 4.5 v v cc =4.5v, i oh =-8ma 3.94 output voltage low-level v ol v cc =4.5v, i ol =50 a 0.1 v v cc =4.5v, i ol =8ma 0.36 input leakage current i i ( leak ) v cc =0v to 5.5v, v in =0 or 5.5v 0.1 a leakage current (for output in high-impedance state) i oz v cc =5.5v, v in =v ih or v ih , v out =0 or 5.5v 0.25 a quiescent supply current i cc v cc =5.5v, v in =v cc or gnd, i out =0 4 a additional quiescent supply current i cc v cc =5.5v, one input at 3.4v, other inputs at v cc or gnd 1.35 ma input capacitance c i v cc =5v, v in =v cc or gnd 4 10 pf output capacitance c o v cc =5v, v out =v cc or gnd 9 pf
u74ahct373 cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-685.a ? switching characteristics parameter symbol test conditions min typ max unit from d to q t plh /t phl v cc =5v0.5v, c l =15pf 5.1 8.5 ns v cc =5v0.5v, c l =50pf 5.9 9.5 from le to q v cc =5v0.5v, c l =15pf 7.7 12.3 v cc =5v0.5v, c l =50pf 8.5 13.3 from oe to q t pzl /t pzh v cc =5v0.5v, c l =15pf 6.3 10.9 ns v cc =5v0.5v, c l =50pf 7.1 11.9 from oe to q t plz /t phz v cc =5v0.5v, c l =15pf 6 10.2 ns v cc =5v0.5v, c l =50pf 6.8 11.2 pulse width, le high t w v cc =5v0.5v 6.5 ns setup time, data before le t su v cc =5v0.5v 1.5 ns hold time, data after le t h v cc =5v0.5v 3.5 ns ? operating characteristics (t a =25 ) parameter symbol test conditions min typ max unit power dissipation capacitance c pd no load, f=1mhz 17 pf
u74ahct373 cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-685.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 5v0.5v v cc 3ns v cc /2 v cc 15pf 1k ? 0.5v 50pf
u74ahct373 cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-685.a ? test circuit and waveforms(cont.) v m v in 0v v oh v ol voltage waveforms propagation delay times input output t plh t phl t plh t phl output v m v m v m v m v m v oh v ol note: a. c l includes probe and jig capacitance. b. p rr 1mhz, z o = 50 ? , t r 3ns, t f 3ns. 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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