unisonic technologies co., ltd u74hct20 cmos ic www.unisonic.com.tw 1 of 4 copyright ? 2011 unisonic technologies co., ltd qw-r502-657.a dual 4-input nand gates ? description the u74hct20 contains two independent 4-input nand gates. they perform the boolean function y=a b c d ??? or y=a bcd +++ in positive logic. ? features * operation voltage range: 4.5v~5.5v * low quiescent current: i cc =2 a(max) * high speed: t pd =16ns @ 4.5v(typ) * low input current: 100na max * inputs are ttl voltage compatiabel ? ordering information ordering number lead free halogen free package packing u74hct20l-p14-t u74hct 20g-p14-t tssop-14 tube U74HCT20L-P14-R u74hct20g-p 14-r tssop-14 tape reel
u74hct20 cmos ic unisonic technologies co., ltd 2 of 4 www.unisonic.com.tw qw-r502-657.a ? pin configuration 1a 1b nc 1c 1d 1y gnd v cc 2d 2c nc 2b 2a 2y 1 2 3 4 5 6 7 14 13 12 11 10 9 8 ? function table input ( a ) input(b) input ( c ) input ( d ) output ( y ) h h h h l l x x x h x l x x h x x l x h x x x l h ? logic diagram (positive logic) 1a 1b 1c 1d 1y 1 2 4 5 6 2a 2b 2c 2d 2y 9 10 12 13 8
u74hct20 cmos ic unisonic technologies co., ltd 3 of 4 www.unisonic.com.tw qw-r502-657.a ? absolute maximum rating (unless otherwise specified) parameter symbol ratings unit supply voltage v cc -0.5~7 v input clamp current i ik -20 ma output clamp current i ok 20 ma output current i out 25 ma v cc or gnd current i cc 50 ma storage temperature t stg -65 ~ +150 note: absolute maximum ratings are those values beyond 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 conditions min typ max unit supply voltage v cc 4.5 5.5 v input voltage v in 0 vcc v output voltage v out 0 v cc v input transition rise or fall rate t r , t f v cc =4.5v 500 ns operating temperature t a -40 85 ? static characteristics (t a = 25 ) parameter symbol test conditions min typ max unit high-level input voltage v ih v cc = 4.5v to 5.5v 2.0 v low-level input voltage v il v cc = 4.5v to 5.5v 0.8 v v cc = 4.5v, i o = -20 a 4.4 4.999 high-level output voltage v oh v cc = 4.5v, i o = -4ma 3.98 4.3 v v cc = 4.5v, i o = 20 a 0.001 0.1 low-level output voltage v ol v cc = 4.5v, i o = 4ma 0.17 0.26 v input leakage current i i(leak) v cc = 5.5v ,v in = v cc or gnd 0.1 100 na quiescent supply current i cc v cc = 5.5v, v in = v cc or gnd , i o = 0 2 a a dditional quiescent supply current i cc one input at v cc -2.1v, other inputs at 0 or v cc 100 360 ua input capacitance c in v cc =4.5v~5.5v 3 10 pf ? dynamic characteristics (t a =25 , input: t r =t f =6ns, unless otherwise specified ) parameter symbol test conditions min typ max unit propagation delay from input(a or b) to output(y) t plh , t phl v cc =4.5v, c l =50pf 16 28 ns output transition time t t v cc =4.5v, c l =50pf 7 15 ns ? operating characteristics (t a =25 , unless otherwise specified ) parameter symbol test condition ratings unit power dissipation capacitance c pd no load 38 pf
u74hct20 cmos ic unisonic technologies co., ltd 4 of 4 www.unisonic.com.tw qw-r502-657.a ? test circuit and waveforms output c l (note) note : c l includes probe and jig capacitance. + 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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