unisonic technologies co., ltd u74lvc245 cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2010 unisonic technologies co., ltd qw-r502-176.ba octal bus transceiver with 3-state outputs ? description the u74lvc245 is designed for the communication between data buses asynchronously. while the dire ction-control(dir) is high, data transmits from the a bus to the b bus. data transmits from the b bus to the a bus if dir is low. the output-enable( oe ) will isolate the device from the buses when high voltage is applied on it. ? features * operate from 1.65v to 3.6v * input accept voltages to 5.5v * partial-power-down mode operation ? ordering information ordering number lead free halogen free package packing u74lvc245l-d20-t u74lvc245g-d20-t dip-20 tube u74lvc245l-p20-r u74lvc245g-p20-r tssop-20 tape reel u74lvc245l-p20-t u74lvc245g-p20-t tssop-20 tube U74LVC245L-S20-R u74lvc245g-s20-r sop-20 tape reel u74lvc245l-s20-t u74lvc245g-s20-t sop-20 tube
u74lvc245 cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-176. ba ? pin configuration 1 2 3 4 5 6 7 17 16 15 14 13 12 11 gnd v cc dir a2 a3 a4 a5 b3 b4 b5 b6 b7 b8 8 9 10 a7 a8 a6 20 19 18 b1 b2 a1 oe ? function table (each gate) input oe dir function h isolation l h transmit data from a bus to b bus l l transmit data from b bus to a bus ? logic diagram (positive logic)
u74lvc245 cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-176. ba ? 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 hi gh-impedance or power-off state -0.5~6.5 voltage applied to output in high or low state v out -0.5~vcc+0.5 v input clamp current i ik -50 ma output clamp current i ok -50 ma output current i out 50 ma vcc or gnd current i cc 100 ma storage temperature t stg -65 ~ +150 note: 1. the input and output voltage ratings may be exceeded if the input and output curr ent ratings are observed. 2. 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 test conditions min typ max unit operating 1.65 3.6 supply voltage v cc data retention only 1.5 v v cc = 1.65 v to 1.95 v 0.65*vcc v cc = 2.3 v to 2.7 v 1.7 input voltage high-level v ih v cc = 2.7 v to 3.6 v 2 v v cc = 1.65 v to 1.95 v 0.35*vcc v cc = 2.3 v to 2.7 v 0.7 input voltage low-level v il v cc = 2.7 v to 3.6 v 0.8 v input voltage v in 0 5.5 v output voltage v out 0 vcc v ? electrical characteristics parameter symbol test conditions min typ max unit v cc =1.65v to 3.6v, i oh = -100ua vcc-0.2 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 output voltage high-level v oh v cc =3v, i oh = ?24ma 2.3 v v cc =1.65v to 3.6v, i ol = 100ua 0.1 v cc =1.65v, i ol = 4ma 0.24 v cc =2.3v, i ol = 8ma 0.3 v cc =2.7v, i ol = 12ma 0.4 output voltage low-level v ol v cc =3v, i ol = 24ma 0.55 v 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 cc =5.5v 1 ua input leakage current (for i/o ports) i oz v cc =3.6v, v out = 0~5.5v 1 ua v cc =3.6v,v in =v cc or gnd i out = 0 1 quiescent supply current i q v cc =3.6v, 3.6v Q ? v in Q 5.5v, i out =0 1 ua 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 in v cc =3.3v, v in = v cc or gnd 4 pf
u74lvc245 cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-176. ba ? switching characteristics parameter symbol test conditions min typ max unit v cc =1.8v 0.15v 1 6 12.2 ns v cc =2.5v 0.2v 1 3.9 7.8 ns v cc =2.7v 1 4.2 7.1 ns from a to y or from b to a t plh /t phl v cc =3.3v 0.3v 1.5 3.8 6.1 ns v cc =1.8v 0.15v 1 7 14.8 ns v cc =2.5v 0.2v 1 4.5 10 ns v cc =2.7v 1 5.4 9.3 ns from oe to a or b t pzl /t pzh v cc =3.3v 0.3v 1.5 4.4 8.3 ns v cc =1.8v 0.15v 1 7.8 16.5 ns v cc =2.5v 0.2v 1 4 9 ns v cc =2.7v 1 4.4 8.3 ns from oe a to a or b t plz /t phz v cc =3.3v 0.3v 1.7 4.1 7.3 ns ? operating characteristics parameter symbol test conditions min typ max unit oe =0, f=10mhz, v cc =1.8v 42 pf oe =0, f=10mhz, v cc =2.5v 43 pf oe =0, f=10mhz, v cc =3.3v 45 pf oe =1, f=10mhz, v cc =1.8v 1 pf oe =1, f=10mhz, v cc =2.5v 1 pf power dissipation capacitance cpd oe =1, f=10mhz, v cc =3.3v 2 pf
u74lvc245 cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-176. ba ? test circuit and waveforms v ext v cc v in t r /t f v m v c l r l t plh /t phl t pzh /t phz t pzl /t plz 1.8v 0.15v v cc 2ns v cc /2 0.15v 30 p f1 k ? open gnd 2*v cc 2.5v 0.2v v cc 2ns v cc /2 0.15v 30 p f 500 ? open gnd 2*v cc 2.7 v 2.7 v 2.5ns 1.5v 0.3v 50 p f 500 ? open gnd 6 v 3.3v 0.3v 2.7 v 2.5ns 1.5v 0.3v 50 p f 500 ? open gnd 6 v fig-1 load circuitry fig-2 propagation delay waves
u74lvc245 cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-176. ba 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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