unisonic technologies co., ltd u74hc244 cmos ic www.unisonic.com.tw 1 of 5 copyright ? 2012 unisonic technologies co., ltd qw-r502-196.c octal buffer and line driver with 3-state output ? description the u74hc244 are octal buffer and line drivers with non-inverting 3-state outputs. when n is high, the outputs nq will be in the oe high impedance. ? features * operation voltage range: 2~6v * 3-state output * output drive capability: 15 lsttl loads ? ordering information ordering number package packing lead free halogen free u74hc244l-d20-t u74hc244g-d20-t dip-20 tube u74hc244l-s20-r u74hc244g-s20-r sop-20 tape reel u74hc244l-s20-t u74hc244g-s20-t sop-20 tube u74hc244l-p20-r U74HC244G-P20-R tssop-20 tape reel u74hc244l-p20-t u74hc244g-p20-t tssop-20 tube
u74hc244 cmos ic unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r502-196.c ? pin configuration 1 2 3 4 5 6 7 17 16 15 14 13 12 11 gnd v cc 2y4 1a2 2y3 1a3 1y2 2a3 1y3 2a2 1y4 2a1 8 9 10 1a4 2y1 2y2 20 19 18 1y1 2a4 1a1 oe oe 1 2 ? function table (each gate) input ( n oe ) input(nan) output(nyn) h w z l h h l l l ? logic diagram (positive logic) 1oe 1a1 1a2 1a3 1a4 1y1 1y2 1y3 1y4 2oe 2a1 2a2 2a3 2a4 2y1 2y2 2y3 2y4 1oe 1a1 1a2 1a3 1a4 2 1 4 6 8 1y3 1y2 12 14 18 16 1y1 1y4 en 2oe 2a1 2a2 2a3 2a4 11 19 13 15 17 1y3 1y2 3 5 8 7 2y1 1y4 en iec logic symbol
u74hc244 cmos ic unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r502-196.c ? absolute maximum ratings (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 35 ma v cc or gnd current i cc 70 ma storage temperature t stg -65 ~ +150 c 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 2 6 v input voltage v in 0 v cc v output voltage v out 0 v cc v input rise or fall times t r , t f v cc =2v 1000 ns v cc =4.5v 500 ns v cc =6v 400 ns operating temperature t a -40 85 c ? static characteristics (t a =25c, unless otherwise specified) parameter symbol test conditions min typ max unit high-level input voltage v ih v cc =2v 1.5 v v cc =4.5v 3.15 v v cc =6v 4.2 v low-level input voltage v il v cc =2v 0.5 v v cc =4.5v 1.35 v v cc =6v 1.8 v high-level output voltage v oh v cc =2v, i oh =-20 a 1.9 1.998 v v cc =4.5v, i oh =-20 a 4.4 4.499 v v cc =6v, i oh =-20 a 5.9 5.999 v v cc =4.5v, i oh =-6ma 3.98 4.3 v v cc =6v, i oh =-7.8ma 5.48 5.8 v low-level output voltage v ol v cc =2v, i ol =20 a 0.002 0.1 v v cc =4.5v, i ol =20 a 0.001 0.1 v v cc =6v, i ol =20 a 0.001 0.1 v v cc =4.5v, i ol =6ma 0.17 0.26 v v cc =6v, i ol =7.8ma 0.15 0.26 v input leakage current i i ( leak ) v cc =6v, v in =v cc or 0 100 na output off-state current i oz v cc =6v,v out =v cc or 0,v in =v ih or v il 0.5 a quiescent supply current i q v cc =6v, v in =v cc or 0, i out =0 8 a input capacitance c in v cc =2v~6v 3 10 pf
u74hc244 cmos ic unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r502-196.c ? dynamic characteristics (t a =25c, input: t r , t f =6ns) parameter symbol test conditions min typ max unit propagation delay from input (a) to output(y) t plh /t phl v cc =2v, c l =50pf 40 115 ns v cc =2v, c l =150pf 56 165 ns v cc =4.5v, c l =50pf 13 23 ns v cc =4.5v, c l =150pf 18 33 ns v cc =6v, c l =50pf 11 20 ns v cc =6v, c l =150pf 15 28 ns 3-state output enable time n oe to nyn t pzh /t pzl v cc =2v, c l =50pf 75 150 ns v cc =2v, c l =150pf 100 200 ns v cc =4.5v, c l =50pf 15 30 ns v cc =4.5v, c l =150pf 20 40 ns v cc =6v, c l =50pf 13 26 ns v cc =6v, c l =150pf 17 34 ns 3-state output disable time n oe to nyn t phz /t plz v cc =2v, c l =50pf 75 150 ns v cc =4.5v, c l =50pf 15 30 ns v cc =6v, c l =50pf 13 26 ns ? operating characteristics parameter symbol test conditions min typ max unit power dissipation capacitance cpd no load 35 pf
u74hc244 cmos ic unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r502-196.c ? test circuit and waveforms 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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