unisonic technologies co., ltd u74hc157 cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2012 unisonic technologies co., ltd qw-r502-812.a quadruple 2-line to 1-line data selectors / multiplexers ? description the u74hc157 is a quadruple 2-line to 1-line data selectors/multiplexers. when g is high all outputs are low. when g is low a 4-bit word is selected from one of two sources and is routed to the four outputs. t he device provides true data. ? features * wide supply voltage range from 2v to 6v * typical t pd at 11ns from a or b to y at 6v, c l =50pf * low power consumption, i cc = 8 a (max) at 6v * 6 ma output driver at 5v * low input current of 0.1ua max sop-16 tssop-16 ? ordering information ordering number package packing lead free halogen free u74hc157l-s16-r u74hc157g-s16-r sop-16 tape reel u74hc157l-s16-t u74hc157g-s16-t sop-16 tube u74hc157l-p16-r U74HC157G-P16-R tssop-16 tape reel u74hc157l-p16-t u74hc157g-p16-t tssop-16 tube
u74hc157 cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-812.a ? pin configuration ? function table inputs outputs g a/ b a b y h l l l l x l l h h x l h x x x x x l h l l h l h ? logic diagram
u74hc157 cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-812.a ? absolute maximum rating (t a =25c , unless otherwise specified) parameter symbol ratings unit supply voltage range v cc -0.5~7 v input clamp current (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 current 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 operation is not implied. ? recommended operating conditions parameter symbol conditions min typ max unit supply voltage v cc 2 5 6 v high-level input voltage v ih v cc =2v 1.5 v v cc =4.5v 3.15 v cc =6v 4.2 lo w -level input voltage v il v cc =2v 0.5 v v cc =4.5v 1.35 v cc =6v 1.8 input voltage v in 0 v cc v output voltage v out 0 v cc v input transition rise or fall rate t/ v v cc =2v 1000 ns/v v cc =4.5v 500 v cc =6v 400 operating temperature t a -40 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 =2v 1.9 1.998 v 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 i oh =-7.8 ma, v cc =6v 5.48 5.8 low-level output voltage v ol i oh =20 a, v cc =2v 0.002 0.1 v i oh =20 a, v cc =4.5v 0.001 0.1 i oh =20 a, v cc =6v 0.001 0.1 i oh =6 ma, v cc =4.5v 0.17 0.26 i oh =7.8 ma, v cc =6v 0.15 0.26 input leakage current i i(leak) v in =v cc or gnd, v cc =6v 0.1 100 na quiescent supply current i cc v in =v cc or gnd, i out =0, v cc =6v 8 a input capacitance c in v cc =6v 3 10 pf
u74hc157 cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-812.a ? switching characteristics see fig. 1 and fig. 2 for test circuit and waveforms. parameter symbol test conditions min typ max unit propagation delay from input a or b to output y, t pd t pd v cc =2v, c l =50pf 63 125 ns v cc =2v, c l =150pf 81 190 v cc =4.5v, c l =50pf 13 25 v cc =4.5v, c l =150pf 23 38 v cc =6v, c l =50pf 11 21 v cc =6v, c l =150pf 18 33 propagation delay from input a/ b to output y, t pd t pd v cc =2v, c l =50pf 67 125 ns v cc =2v, c l =150pf 81 210 v cc =4.5v, c l =50pf 18 25 v cc =4.5v, c l =150pf 23 42 v cc =6v, c l =50pf 14 21 v cc =6v, c l =150pf 18 36 propagation delay from input g to output y, t pd t pd v cc =2v, c l =50pf 59 115 ns v cc =2v, c l =150pf 91 190 v cc =4.5v, c l =50pf 16 23 v cc =4.5v, c l =150pf 24 38 v cc =6v, c l =50pf 13 20 v cc =6v, c l =150pf 18 33 output transition time t t v cc =2v, c l =50pf 28 60 ns v cc =2v, c l =150pf 45 210 v cc =4.5v, c l =50pf 8 12 v cc =4.5v, c l =150pf 17 42 v cc =6v, c l =50pf 6 10 v cc =6v, c l =150pf 13 36 note: t plh and t phl is the same as t pd ? operating characteristics (t a =25c , unless otherwise specified) parameter symbol test conditions min typ max unit power dissipation capacitance c pd no load 40 pf
u74hc157 cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-812.a ? test circuit and waveforms fig. 1 load circuitry for switching times. fig. 2 propagation delay from input to output and output transition time. notes: 1. c l includes probe and jig capacitance. 2. all input pulses are supplied by generators having the following characteristics: prr 1mhz, z o =50 ? , t r =6ns, t f =6ns.
u74hc157 cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-812.a 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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