unisonic technologies co., ltd u74lvc244 cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2014 unisonic technologies co., ltd qw-r502-245.d octal buffer/driver with 3-state outputs ? description the utc u74lvc244 contains two 4-bit line drivers with separate output-enable ( oe ) inputs. when oe is low, the device passes data from the a to the y. when oe is high, the outputs are in the high-impedance state. the utc u74lvc244 can be used in a mixed 3.3v/5v system environment. ? features * operate from 1.65v to 3.6v * input accept voltages to 5.5v * partial-power-down mode operation * max tpd is 5.9ns at 3.3v ? ordering information ordering number package packing lead free halogen free u74lvc244l-d20-t u74lvc244g-d20-t dip-20 tube u74lvc244l-s20-t U74LVC244G-S20-T sop-20 tube u74lvc244l-s20-r u74lvc244g-s20-r sop-20 tape reel u74lvc244l-p20-t u74lvc244g-p20-t tssop-20 tube u74lvc244l-p20-r u74lvc244g-p20-r tssop-20 tape reel ? marking information package marking dip-20/sop-20/tssop-20
u74lvc244 cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-245.d ? pin configuration 1 2 3 4 5 6 7 17 16 15 14 13 12 11 gnd v cc 1oe 1a1 2y4 1a2 2y3 1a3 1y2 2a3 1y3 2a2 1y4 2a1 8 9 10 1a4 2y1 2y2 20 19 18 1y1 2oe 2a4 ? function table (each gate) input ( oe ) input(a) output(y) h x z l h h l l l ? logic diagram (positive logic)
u74lvc244 cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-245.d ? absolute maximum ratings parameter symbol ratings unit supply voltage v cc -0.5~6.5 v input voltage v in -0.5~ 6.5 v voltage applied to output in high-impedance or power-off state v out -0.5~6.5 v voltage applied to output in high or low state -0.5~v cc +0.5 input clamp current i ik -50 ma output clamp current i ok -50 ma output current i out 50 ma v cc or gnd current i cc 100 ma operating temperature t opr -40~ +125 c storage temperature t stg -65 ~ +150 c note : 1. 2. the input and output voltage ratings may be exceeded if the input and output current ratings are observed. a bsolute maximum ratings are those values beyond which the device could be permanently damaged. a bsolute maximum ratings are stress ratings only an d functional device operat ion is not implied. ? recommended operating conditions parameter symbol conditions min typ max unit supply voltage v cc operating 1.65 3.6 v data retention only 1.5 v input voltage v in 0 5.5 v output voltage v out 0 v cc v high-level input voltage v ih v cc =1.65v to 1.95v 0.65v cc v v cc =2.3v to 2.7v 1.7 v v cc =2.7v to 3.6v 2 v low-level input voltage v il v cc =1.65v to 1.95v 0.35v cc v v cc =2.3v to 2.7v 0.7 v v cc =2.7v to 3.6v 0.8 v high-level output current i oh v cc =1.65v -4 ma v cc =2.3v -8 ma v cc =2.7v -12 ma v cc =3v -24 ma low-level output current i ol v cc =1.65v 4 ma v cc =2.3v 8 ma v cc =2.7v 12 ma v cc =3v 24 ma ? thermal data parameter symbol ratings unit junction to ambient dip-20 ja 69 c /w sop-20 58 tssop-20 83
u74lvc244 cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-245.d ? electrical characteristics parameter symbol test conditions min typ max unit high-level output voltage v oh v cc =1.65v to 3.6v, i oh =-100ua v cc -0.2 v v cc =1.65v, i oh =-4ma 1.29 v cc =2.3v, i oh =-8ma 1.9 v cc =2.7v, i oh =-12ma 2.2 v cc =3v, i oh =-12ma 2.4 v cc =3v, i oh =-24ma 2.3 low-level output voltage v ol v cc =1.65v to 3.6v, i oh =100ua 0.1 v v cc = 1.65v, i oh =4ma 0.24 v cc =2.3v, i oh =8ma 0.3 v cc =2.7v, i oh =12ma 0.4 v cc =3v, i oh =24ma 0.55 input leakage current i i ( leak ) v cc =3.6v, v in =5.5 v or gnd 1 ua power off leakage current i off v cc =0v, v in or v out =5.5v 1 ua output off-state current i oz v cc =3.6v, v out =0 or 5.5v 1 ua quiescent supply current i q v cc =3.6v ,v in =v cc or gnd, i out =0 1 ua v cc =3.6v ,3.6v Q v in Q 5.5v, i out =0 1 additional quiescent supply current ? i q v cc =2.7v to 3.6v, one input at v cc -0.6v,other inputs at v cc or gnd 500 ua input capacitance c i v cc =3.3v, v in =v cc or gnd 4 pf output capacitance c o v cc =3.3v, v out =v cc or gnd 5.5 pf ? switching characteristics parameter symbol test conditions min typ max unit from input(a) to output(y) t pd v cc =1.5v 1 7 14.4 ns v cc =1.8v0.15v 1 5.9 10.4 v cc =2.5v0.2v 1 4.2 7.4 v cc =2.7v 1 4.2 6.7 v cc =3.3v0.3v 1.5 3.9 5.7 from input( oe ) to output(y) t en v cc =1.5v 1 8.3 17.8 ns v cc =1.8v0.15v 1 6.4 12.1 v cc =2.5v0.2v 1 4.6 9.1 v cc =2.7v 1 5 8.4 v cc =3.3v0.3v 1.5 4.5 7.4 from input( oe ) to output(y) t dis v cc =1.5v 1 7.2 15.6 ns v cc =1.8v0.15 v 1 5.8 11.6 v cc =2.5v0.2v 1 3.7 7.3 v cc =2.7v 1 3.8 6.6 v cc =3.3v0.3v 1.5 3.8 6.3 ? operating characteristics parameter symbol test conditions min typ max unit power dissipation capacitance c pd oe=0, f=10mhz, v cc =1.8v 43 pf oe=0, f=10mhz, v cc =2.5v 43 oe=0, f=10mhz, v cc =3.3v 44 oe=1, f=10mhz, v cc =1.8v 1 oe=1, f=10mhz, v cc =2.5v 1 oe=1, f=10mhz, v cc =3.3v 2
u74lvc244 cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-245.d ? test circuit and waveforms v cc v in t r /t f v m v c l r l v ext t plh /t phl t pzh /t phz t pzl /t plz 1.5v v cc 2ns v cc /2 0.1v 15pf 2k ? open gnd 2*v cc 1.8v0.15v v cc 2ns v cc /2 0.15v 30pf 1k ? open gnd 2*v cc 2.5v0.2v v cc 2ns v cc /2 0.15v 30pf 500 ? open gnd 2*v cc 2.7v 2.7v 2.5ns 1.5v 0.3v 50pf 500 ? open gnd 6v 3.3v0.3v 2.7v 2.5ns 1.5v 0.3v 50pf 500 ? open gnd 6v fig-1 load circuitry fig-2 propagation delay waves
u74lvc244 cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-245.d 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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