unisonic technologies co., ltd U74HCT373 cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2011 unisonic technologies co., ltd qw-r502-655.a octal transparent d-type latches with 3-state outputs ? description the U74HCT373 is an octal transparent d-type latch with 3-state outputs, and it has 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 l ogic 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 the high-impedance state. to ensure the high-impedance state during power up or power down, oe should be tied to v cc through a pull-up resistor; the minimum value of t he resistor is determined by the current-sinking capab ility 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 21ns at v cc =5.5v, c l =50pf * typ v ol < 0.26v at v cc =4.5v, i ol =6ma, t a =25c * typ v oh > 3.94v at v cc =4.5v, i oh =-6ma, t a =25c tssop-20 ? ordering information ordering number lead free halogen free package packing U74HCT373l-p20-r U74HCT373g-p20-r tssop-20 tape reel U74HCT373l-p20-t U74HCT373g-p20-t tssop-20 tube www.datasheet.net/ datasheet pdf - http://www..co.kr/
U74HCT373 cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-655.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 www.datasheet.net/ datasheet pdf - http://www..co.kr/
U74HCT373 cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-655.a ? absolute maximum rating parameter symbol ratings unit supply voltage v cc -0.5 ~ 7 v input voltage (note 3) v i -0.5 ~ 7 v output voltage (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 35 ma v cc or gnd current i cc 70 ma storage temperature t stg -65 ~ +150 note: 1. absolute maximum ratings are those values beyo nd which the device could be permanently damaged. note: absolute maximum ratings are stress ratings on ly and functional device operation is not implied. note: 2. the input and output voltage ratings may be exceed ed if the input and output cu rrent 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 input rise or fall times t r , t f 500 ns/v operating free-air temperature t a -40 85 ? electrical characteristics (t a =25c) parameter symbol test conditions min typ max unit v cc =4.5v, i oh =-20 a 4.4 4.499 output voltage high-level v oh v cc =4.5v, i oh =-6ma 3.98 4.3 v v cc =4.5v, i ol =20 a 0.001 0.1 output voltage low-level v ol v cc =4.5v, i ol =6ma 0.17 0.26 v input leakage current i i(leak) v cc =5.5v, v in =0 or 5.5v 0.1 100 na 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 0.01 0.5 a quiescent supply current i cc v cc =5.5v, v in =v cc or gnd, i out =0 8 a additional quiescent supply current i cc v cc =5.5v,one input at 0.5v or3.4v, other inputs at v cc or gnd 1.4 2.4 ma input capacitance c i v cc =4.5v to 5v 3 10 pf www.datasheet.net/ datasheet pdf - http://www..co.kr/
U74HCT373 cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-655.a ? switching characteristics parameter symbol test conditions min typ max unit v cc =4.5v, c l =50pf 25 35 v cc =5.5v, c l =50pf 21 32 v cc =4.5v, c l =150pf 32 52 from d to q v cc =5.5v, c l =150pf 27 47 v cc =4.5v, c l =50pf 28 35 v cc =5.5v, c l =50pf 25 32 v cc =4.5v, c l =150pf 38 52 from le to q t pd (t plh /t phl ) v cc =5.5v, c l =150pf 36 47 ns v cc =4.5v, c l =50pf 26 35 v cc =5.5v, c l =50pf 23 32 v cc =4.5v, c l =150pf 33 52 from oe to q t en (t pzl /t pzh ) v cc =5.5v, c l =150pf 28 47 ns v cc =4.5v, c l =50pf 23 35 from oe to q t dis (t plz /t phz ) v cc =5.5v, c l =50pf 22 32 ns v cc =4.5v, c l =50pf 10 12 v cc =5.5v, c l =50pf 9 11 v cc =4.5v, c l =150pf 18 42 output transition rise/fall time t t (t r /t f ) v cc =5.5v, c l =150pf 16 38 ns v cc =4.5v 20 pulse width, le high t w v cc =5.5v 17 ns v cc =4.5v 10 setup time, data before le t su v cc =5.5v 9 ns v cc =4.5v 10 hold time, data after le t h v cc =5.5v 10 ns ? operating characteristics (t a =25 ) parameter symbol test conditions ratings unit power dissipation capacitance c pd no load 50 pf www.datasheet.net/ datasheet pdf - http://www..co.kr/
U74HCT373 cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-655.a ? test circuit and waveforms test s1 t plh /t phl open t plz /t pzl v load t phz /t pzh gnd input v cc v in t r , t f v m v load c l r l v 15pf 5v0.5v v cc 3ns v cc /2 v cc 50pf 1k ? 0.5v www.datasheet.net/ datasheet pdf - http://www..co.kr/
U74HCT373 cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-655.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 6ns, t f 6ns. 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. www.datasheet.net/ datasheet pdf - http://www..co.kr/
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