unisonic technologies co., ltd U74HCT374 cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2011 unisonic technologies co., ltd qw-r502-646.a octal edge-triggered d-type flip-flops with 3-state outputs ? description the U74HCT374 is a octal edge-triggered d-type flip-flops with 3-state outputs and it has 8 channels. when the oe input is low, on the positive transition of the clock (clk) input, the q outputs are set to the logic levels of the data (d) inputs. when the oe input is high, the outputs are in the high-impedance. 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 25ns 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 > 3.98v at v cc =4.5v, i oh =-6ma, t a =25c tssop-20 ? ordering information ordering number lead free halogen free package packing U74HCT374l-p20-r U74HCT374g-p20-r tssop-20 tape reel U74HCT374l-p20-t U74HCT374g-p20-t tssop-20 tube www.datasheet.net/ datasheet pdf - http://www..co.kr/
U74HCT374 cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-646.a ? pin configuration ? function table inputs( oe ) inputs(clk) inputs(d) output(q) l h h l l l l h or l x q 0 h x x z ? logic symbol 1 3 4 7 8 13 14 17 18 11 19 16 15 12 9 6 5 2 1q 2q 8q clk 3q 4q 5q 6q 7q 2d 3d 4d 5d 6d 7d 8d 1d 1d en c1 oe ? logic diagram www.datasheet.net/ datasheet pdf - http://www..co.kr/
U74HCT374 cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-646.a ? 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 v cc or gnd current i cc 70 ma output current i out 35 ma input clamp current i ik -20 ma output clamp current i ok 20 ma operating temperature t opr -40 ~ + 85 storage temperature t stg -65 ~ + 150 note: 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. ? recommended operating conditions parameter symbol ratings 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 ~ v cc 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 500 ns/v operating temperature t a -40 ~ 85 ? electrical characteristics 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 or 3.4v, 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/
U74HCT374 cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-646.a ? timing requirements parameter symbol test conditions min typ max unit v cc =4.5v 31 clock frequency f clock v cc =5.5v 36 mhz v cc =4.5v 16 pulse width, clk high or low t w v cc =5.5v 14 ns v cc =4.5v 20 setup time, data before clk t su v cc =5.5v 17 ns v cc =4.5v 10 hold time, data after clk t h v cc =5.5v 10 ns ? switching characteristics (see test circuit and waveforms) parameter symbol test conditions min typ max unit v cc =4.5v, c l =50pf 31 36 maximum clock frequency f (max) v cc =5.5v, c l =50pf 36 40 mhz v cc =4.5v, c l =50pf 30 36 v cc =5.5v, c l =50pf 25 32 v cc =4.5v, c l =150pf 40 46 from clk to q t pd (t plh /t phl ) v cc =5.5v, c l =150pf 35 41 ns v cc =4.5v, c l =50pf 26 30 v cc =5.5v, c l =50pf 23 27 v cc =4.5v, c l =150pf 34 40 from oe to q t en (t pzl /t pzh ) v cc =5.5v, c l =150pf 29 36 ns v cc =4.5v, c l =50pf 23 30 from oe to q t dis (t plz /t phz ) v cc =5.5v, c l =50pf 22 27 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 ? operating characteristics (t a =25 ) parameter symbol test conditions ratings unit power dissipation capacitance c pd no load, v cc = 5 v , f=1mhz 85 pf www.datasheet.net/ datasheet pdf - http://www..co.kr/
U74HCT374 cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-646.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 v m v in 0 v pulse duration t w input v m www.datasheet.net/ datasheet pdf - http://www..co.kr/
U74HCT374 cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-646.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. note: 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. www.datasheet.net/ datasheet pdf - http://www..co.kr/
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