unisonic technologies co., ltd u74ahct374 cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2011 unisonic technologies co., ltd qw+r502-690.a octal edge-triggered d-type flip-flops with 3-state outputs ? description the u74ahct374 is a octal edge-triggered d-type flip-flops with 3-state outputs and 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 9.4ns at v cc =5v, c l =15pf * typical v ol < 0.36v at v cc =4.5v, i ol =8ma, t a =25c * typical v oh > 3.94v at v cc =4.5v, i oh =-8ma, t a =25c tssop-20 ? ordering information ordering number package packing lead free halogen free U74AHCT374L-P20-R u74ahct374g-p20-r tssop-20 tape reel u74ahct374l-p20-t u74ahct374g-p20-t tssop-20 tube
u74ahct374 cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-690.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
u74ahct374 cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-690.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 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- l evel output current i oh -8 ma low- l evel 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 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 i n =v cc or gnd 4 10 pf output capacitance c o v cc =5v, v out =v cc or gnd 9 pf
u74ahct374 cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-690.a ? switching characteristics ( t a =25 , see test circuit and waveforms) parameter symbol test conditions min typ max unit from clk to q t plh /t phl v cc = 5 v 0.5 v c l =15pf 5.6 9.4 ns c l =50pf 6.4 10.4 from oe to q t pzl /t pzh v cc = 5 v 0.5 v c l =15pf 6.5 10.2 ns c l =50pf 7.3 11.2 from oe to q t plz /t phz v cc = 5 v 0.5 v c l =15pf 6.2 10.2 ns c l =50pf 7 11.2 maximum clock frequency f max v cc = 5 v 0.5 v c l =15pf 90 140 mhz c l =50pf 85 130 pulse width t w v cc = 5 v 0.5 v 6.5 ns setup time t su v cc = 5 v 0.5 v 2.5 ns hold time t h v cc = 5 v 0.5 v 2.5 ns ? operating characteristics (t a =25 ) parameter symbol test conditions min typ max unit power dissipation capacitance c pd no load, v cc = 5 v , f=1mhz 27 pf
u74ahct374 cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-690.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
u74ahct374 cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-690.a ? test circuit and waveforms(cont.) v m v m v m v m v in 0v v oh v ol voltage waveforms propagation delay times input output t plh t phl t plh t phl v o h v ol output v m v m 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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