unisonic technologies co., ltd U74HC540 cmos ic www.unisonic.com.tw 1 of 5 copyright ? 2007 unisonic technologies co., ltd qw-r126-004.a octal buffers and line drivers with 3-state outputs ? description the U74HC540 combines with octal buffers and line drivers with inverting 3-tate outputs. the 3-stat e output is controlled by output enable inputs 1 oe and 2 oe , all eight outputs will be in high-impedance when either of the 2 inputs is applied with high voltage. ? features * operation voltage range: 2v ~ 6v * high-current 3-state outputs for bus driver * inverting outputs tssop-20 *pb-free plating product number: U74HC540l ? ordering information ordering number normal lead free plating package packing U74HC540-p20-r U74HC540l-p20-r tssop-20 tape reel U74HC540-p20-t U74HC540l-p20-t tssop-20 tube U74HC540l-p20-r (1)packing type (2)package type (3)lead plating (1) r: tape reel, t: tube (2) p20: tssop-20 (3) l: lead free plating, blank: pb/sn
U74HC540 cmos ic unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r126-004.a ? pin configuration ? function table (each gate) input output 1 oe 2 oe a y l l l h l l h l h x x z x h x z ? logic diagram (positive logic) y1 18 y2 17 y3 16 y4 15 y5 14 y6 13 y7 12 y8 11 a1 2 a2 3 a3 4 a4 5 a5 6 a6 7 a7 8 a8 9 oe1 1 oe2 19 &en
U74HC540 cmos ic unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r126-004.a ? absolute maximum ratings (unless otherwise specified)(note 1) 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
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 conditions min typ max unit supply voltage v cc 2 5 6 v input voltage v in 0 v cc v output voltage v out 0 v cc v v cc =2v 0 1000 v cc =4.5v 0 500 input transition rise or fall rate t r , t f v cc =6v 0 400 ns operating temperature t a -40 85
? electrical characteristics t a =25 -40~85 parameter symbol test conditions min typ max min max unit v cc =2v 1.5 v cc =4.5v 3.15 high-level input voltage v ih v cc =6v 4.2 v v cc =2v 0.5 v cc =4.5v 1.35 low-level input voltage v il v cc =6v 1.8 v v cc =2v, i oh =-20a 1.9 1.998 1.9 v cc =4.5v, i oh =-20a 4.4 4.499 4.4 v cc =6v, i oh =-20a 5.9 5.999 5.9 v cc =4.5v, i oh =-6ma 3.98 4.3 3.84 high-level output voltage v oh v cc =6v, i oh =-7.8ma 5.48 5.8 5.34 v v cc =2v, i oh =20a 0.002 0.1 0.1 v cc =4.5v, i oh =20a 0.001 0.1 0.1 v cc =6v, i oh =20a 0.001 0.1 0.1 v cc =4.5v, i ol =6ma 0.17 0.26 0.33 low-level output voltage v ol v cc =6v, i ol =7.8ma 0.15 0.26 0.33 v input leakage current i i(leak) v cc =6v, v in =v cc or gnd 0.1 100 1000 na output leakage current i o(leak) v cc =6v, v out =v cc or gnd 0.01 0.5 5 ua quiescent supply current i q v cc =6v, v in =v cc or gnd, i out =0 8 80 a input capacitance c in v cc =2v~6v 3 10 10 pf
U74HC540 cmos ic unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r126-004.a ? switching characteristics (t r , t f 3ns) t a =25 -40~85 parameter symbol test conditions min typ max min max unit v cc =2v, c l =50 pf 35 100 125 v cc =2v, c l =150 pf 60 150 188 v cc =4.5v, c l =50 pf 10 20 25 v cc =4.5v, c l =150 pf 15 30 38 v cc =6v, c l =50 pf 8 17 21 propagation delay from input (a) to output(y) t plh/ t phl v cc =6v, c l =150 pf 13 26 32 ns v cc =2v, c l =50 pf 75 150 188 v cc =2v, c l =150 pf 100 200 250 v cc =4.5v, c l =50 pf 15 30 38 v cc =4.5v, c l =150 pf 20 40 50 v cc =6v, c l =50 pf 13 26 32 3-state output enable time from oe to yn t pzh/ t pzl v cc =6v, c l =150 pf 17 34 43 ns v cc =2v, c l =50 pf 40 150 188 v cc =4.5v, c l =50 pf 18 30 38 3-state output disable time from oe to yn t phz/ t plz v cc =6v, c l =50 pf 17 26 32 ns ? operating characteristics parameter symbol test conditions min typ max unit power dissipation capacitance cpd no load, f=1mhz 35 pf
U74HC540 cmos ic unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r126-004.a ? 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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