unisonic technologies co., ltd U74HC240 cmos ic www.unisonic.com.tw 1 of 7 copyright ? 2010 unisonic technologies co., ltd qw-r502-498.a octal buffers and line drivers with 3-state outputs ? description the U74HC240 is a octal buffer and line driver with 3-state outputs. it is organized as two 4-bit buffers/drivers with separate output-enable ( oe ) inputs. when oe is high, the y outputs are in a high-impedance state and the outputs neither load nor drive the bus lines. when oe is low, the device passes inverted data from the a inputs to the y outputs. the U74HC240 is designed to improve the performance and density of 3-state memory addre ss drivers, clock drivers and bus-oriented receivers and transmitters. to ensure the high-impedance st ate during power up or power down, oe should be tied to v cc through a pull-up resistor; and the minimum value of the re sistor is determined by the current-sinking capab ility of the driver. ? features * wide supply voltage range from 2v to 6v * max t pd of 9 ns from a to y at 6v * low power consumption, i cc = 8 a (max.) at 6v * 6 ma output driver at 5v * low input current of 1 a max ? ordering information ordering number lead free halogen free package packing U74HC240l-p20-r U74HC240g-p20-r tssop-20 tape reel U74HC240l-p20-t U74HC240g-p20-t tssop-20 tube
U74HC240 cmos ic unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r502-498.a ? pin configuration 1 2 3 4 5 6 7 17 16 15 14 13 12 11 gnd v cc 1oe 2y4 1a2 2y3 1a3 1y2 2a3 1y3 2a2 1y4 2a1 8 9 10 1a4 2y1 2y2 20 19 18 1y1 2a4 1a1 2oe ? function table (each buffer) inputs output oe a y l l h h l x l h z ? logic diagram (positive logic) 1 1a1 2 18 4 16 6 14 8 12 1oe 1a2 1a3 1a4 1y1 1y2 1y3 1y4 19 2a1 11 9 13 7 15 5 17 3 2oe 2a2 2a3 2a4 2y1 2y2 2y3 2y4
U74HC240 cmos ic unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r502-498.a ? absolute maximum rating (unless otherwise specified) parameter symbol ratings unit supply voltage v cc -0.5 ~ 7 v input clamp current (v in <0, or v in >v cc ) i ik 20 ma output clamp current (v out <0, or v out >v cc ) 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: 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 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 comditions parameter symbol conditions min typ max unit supply voltage v cc 2 5 6 v 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 input voltage v in 0 v cc v output voltage v out 0 v cc v v cc = 2v 1000 v cc = 4.5v 500 input transition rise or fall rate t/ v v cc = 6v 400 ns/v operating temperature t a -40 85 c
U74HC240 cmos ic unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r502-498.a ? electrical characteristics ( t a =25 c , unless otherwise specified) parameter symbol test conditions min typ (1) max unit i oh = -20 a, v cc = 2v 1.9 1.998 i oh = -20 a, v cc = 4.5v 4.4 4.499 i oh = -20 a, v cc = 6v 5.9 5.999 i oh = -6 ma, v cc = 4.5v 3.98 4.3 high-level output voltage v oh i oh = -7.8 ma, v cc = 6v 5.48 5.8 v i ol = 20 a, v cc = 2v 0.002 0.1 i ol = 20 a, v cc = 4.5v 0.001 0.1 i ol = 20 a, v cc = 6v 0.001 0.1 i ol = 6 ma, v cc = 4.5v 0.17 0.26 low-level output voltage v ol i ol = 7.8 ma, v cc = 6v 0.15 0.26 v input leakage current (a or oe inputs) i i(leak) v in = v cc or gnd, v cc = 6v 0.1 100 a high-impedance state current i oz v o = v cc or gnd, v cc = 6v v i(oe) = v il or v ih 0.01 0.5 a quiescent supply current i cc v in = v cc or gnd, i out = 0, v cc = 6v 8 a input capacitance c in v in = v cc or gnd, v cc = 2v to 6v 3 10 pf ? switching characteristics (t a =25c) parameter symbol test conditions min typ max unit v cc =2v, c l =50pf, r l =1k ? 50 100 v cc =4.5v, c l =50pf, r l =1k ? 10 20 v cc =6v, c l =50pf, r l =1k ? 9 17 ns v cc =2v, c l =150pf, r l =1k ? 75 150 v cc =4.5v, c l =150pf, r l =1k ? 15 30 propagation delay from input a to output y, t pd t plh / t phl v cc =6v, c l =150pf, r l =1k ? 13 26 ns v cc =2v, c l =50pf, r l =1k ? 75 150 v cc =4.5v, c l =50pf, r l =1k ? 15 30 v cc =6v, c l =50pf, r l =1k ? 13 26 ns v cc =2v, c l =150pf, r l =1k ? 100 200 v cc =4.5v, c l =150pf, r l =1k ? 20 40 propagation delay from input oe to output y, t en t pzh / t pzl v cc =6v, c l =150pf, r l =1k ? 17 34 ns v cc =2v, c l =50pf, r l =1k ? 44 150 v cc =4.5v, c l =50pf, r l =1k ? 22 30 propagation delay from input oe to output y, t dis t phz / t plz v cc =6v, c l =50pf, r l =1k ? 21 26 ns v cc =2v, c l =50pf, r l =1k ? 28 60 v cc =4.5v, c l =50pf, r l =1k ? 8 12 v cc =6v, c l =50pf, r l =1k ? 6 10 ns v cc =2v, c l =150pf, r l =1k ? 45 210 v cc =4.5v, c l =150pf, r l =1k ? 17 42 propagation of rise or fall, t t t r / t f v cc =6v, c l =150pf, r l =1k ? 13 36 ns ? operating characteristics ( t a =25 c ) parameter symbol test conditions typ unit power dissipation capacitance per buffer/driver c pd no load 35 pf
U74HC240 cmos ic unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r502-498.a
U74HC240 cmos ic unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r502-498.a ? test circuit and waveforms test s1 t plh /t phl open t plz /t pzl v load t phz /t pzh gnd inputs v in t r , t f v m v load c l r l v cc 6ns v cc /2 v cc 50 or 150pf 500 ? v cc 0v input 10% 90% t r 10% 90% t f voltage waveforms input rise and fall times v m v m v m v m v in 0v v oh v ol voltage waveforms propagation delay and output transition times input output t plh t phl t plh t phl v oh v ol output v m v m 10% 90% t r 10% 90% t f 10% 90% t f 10% 90% t r
U74HC240 cmos ic unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r502-498.a v m v m v m v in 0v v oh input output t pzh t phz t plz t pzl v v ol output v m s1 at gnd s1 at v load 90% voltage waveforms enable and disable times 0v load 10% notes: 1. c l includes probe and jig capacitance. 2. all input pulses are supplied by generator s having the following characteristics: prr 1mhz, z o = 50 ? . 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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