unisonic technologies co., ltd U74HCT125 cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2012 unisonic technologies co., ltd qw-r502-700.b quadruple bus buffer gates with 3-state outputs ? description the U74HCT125 is a quadruple bus buffer gates with 3-state output. when oe is high, the y outputs are in a high-impedance state. when oe is low, the device passes noninverted data from the a input to the y output. to ensure the high-impedance state during power up or power down, oe should be tied to v cc through a pull-up resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. ? features * ttl-voltage compatible * max t pd of 12 ns from a to y at 5.5 v, c l = 50 pf * low power consumption, i cc = 8 a (max) at 5.5v * 6ma output driver at 5v ? ordering information ordering number package packing lead free halogen free U74HCT125l-s14-t U74HCT125g-s14-t sop-14 tube U74HCT125l-s14-r U74HCT125g-s14-r sop-14 tape reel U74HCT125l-p14-t U74HCT125g-p14-t tssop-14 tube U74HCT125l-p14-r U74HCT125g-p14-r tssop-14 tape reel
U74HCT125 cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-700.b ? pin configuration ? function table (each buffer) inputs outputs oe a y l l h h l x h l z ? logic diagram (each buffer) a oe y
U74HCT125 cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-700.b ? absolute maximum rating (unless otherwise specified) parameter symbol ratings unit supply voltage v cc -0.5~7 v input voltage v in -0.5~7 v output voltage v out -0.5~v cc +0.5 v input clamp current (v in <0, or v in >0) 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 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 comditions parameter symbol min typ max unit supply voltage v cc 4.5 5 5.5 v high-level input voltage (v cc =4.5v to 5.5v) v ih 2 v low-level input voltage (v cc = 4.5v to 5.5v) v il 0.8 v input voltage v in 0 v cc v output voltage v out 0 v cc v input transition rise or fall rate t/ v 500 ns/v operating temperature t a -40 25 85 c ? electrical characteristics (t a =25c , unless otherwise specified) parameter symbol test conditions min typ max unit high-level output voltage v oh i oh = -20 a, v cc =4.5 v 4.4 4.5 v i oh = -6 ma, v cc =4.5 v 3.98 4.3 low-level output voltage v ol i ol = 20 a, v cc =4.5 v 0.001 0.1 v i ol = 6 ma , v cc =4.5 v 0.17 0.26 input leakage current (a or oe input) i i(leak) v in = 5.5v or gnd, v cc =5.5 v 0.1 100 a high-impedance state current i oz v out = v cc or gnd, v cc =5.5 v 0.01 0.5 a quiescent supply current i cc v in = v cc or gnd, i out = 0, v cc =5.5 v 8 a additional quiescent supply current i cc one input at 0.5v or 2.4v, v cc =5.5 v, other inputs at v cc or gnd 1.4 2.4 ma input capacitance c in v cc =4.5v to 5.5 v 3 10 pf
U74HCT125 cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-700.b ? switching characteristics (c l = 50 pf, t a =25c) parameter symbol test conditions min typ max unit propagation delay from input a to output y, t pd t plh / t phl v cc =4.5 v 15 26 ns v cc =5.5 v 12 23 propagation delay from input oe to output y, t en t pzh / t pzl v cc =4.5 v 18 28 ns v cc =5.5 v 15 25 propagation delay from input oe to output y, t dis t phz / t plz v cc =4.5 v 15 26 ns v cc =5.5 v 13 23 output transition (rise and fall) time, t t t tlh / t thl v cc =4.5 v 8 15 ns v cc =5.5 v 7 14 (c l = 150 pf, t a =25c) parameter symbol test conditions min typ max unit propagation delay from input a to output y, t pd t plh / t phl v cc =4.5 v 19 36 ns v cc =5.5 v 16 32 propagation delay from input oe to output y, t en t pzh / t pzl v cc =4.5 v 25 40 ns v cc =5.5 v 21 35 output transition (rise and fall) time, t t t tlh / t thl v cc =4.5 v 17 42 ns v cc =5.5 v 14 38 ? operating characteristics (t a =25c) parameter symbol test conditions typ unit power dissipation capacitance c pd 35 pf
U74HCT125 cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-700.b ? test circuit and waveforms test s1 t plh /t phl open t plz /t pzl v load t phz /t pzh gnd v cc input v m v load c l r l v v in t r , t f 5v0.5v v cc 3ns v cc /2 v cc 50pf 1k ? 0.5v 150pf v m v m v m v m v in 0v v oh v ol input output t plh t phl t plh t phl v oh v ol output v m v m t r t f t r t f
U74HCT125 cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-700.b ? test circuit and waveforms(cont.) v m v m v m v in 0v v oh input output t pzh t phz t plz t pzl v load v ol output v m s1 at gnd s1 at v load voltage waveforms enable and disable times 0v - notes: 1. c l includes probe and jig capacitance. 2. all input pulses are supplied by generat ors having the following characteristics: p rr 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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