unisonic technologies co., ltd u74ahc157 cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2011 unisonic technologies co., ltd qw-r502-626.a quadruple 2-line to 1-line data selectors / multiplexers ? description the u74ahc157 is a quadruple 2-line to 1-line data selector/multiplexer. 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. the device provides true data. ? features * wide supply voltage range from 2v to 5.5v * max t pd of 4.1ns from a or b to y at 5v, c l =15pf * low power consumption, i cc = 4 a (max) at 5.5v * 8 ma output driver at 5v ? ordering information ordering number lead free halogen free package packing U74AHC157L-P16-R u74ahc157g -p16-r tssop-16 tape reel u74ahc157l-p16-t u74ahc 157g-p16-t tssop-16 tube
u74ahc157 cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-626.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
u74ahc157 cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-626.a ? absolute maximum rating (t a =25c , unless otherwise specified) parameter symbol ratings unit supply voltage range v cc -0.5~7 v input voltage range v in -0.5~7 v output voltage range v out -0.5~v cc +0.5 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 25 ma v cc or gnd current i cc 50 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. note: 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 operation is not implied. ? recommended operating comditions parameter symbol conditions min typ max unit supply voltage v cc 2 5.5 v v cc = 2v 1.5 v cc = 3v 2.1 high-level input voltage v ih v cc = 5.5v 3.85 v v cc = 2v 0.5 v cc = 3v 0.9 low-level input voltage v il v cc = 5.5v 1.65 v input voltage v in 0 5.5 v output voltage v out 0 v cc v v cc = 2v -50 a v cc = 3.30.3v -4 high-level output current i oh v cc = 50.5v -8 ma v cc = 2v 50 a v cc = 3.30.3v 4 low-level output current i ol v cc = 50.5v 8 ma v cc = 3.30.3v 100 input transition rise or fall rate t/ v v cc = 50.5v 20 ns/v operating temperature t a -40 85 c ? electrical characteristics (t a =25c , unless otherwise specified) parameter symbol test conditions min typ max unit i oh = -50 a, v cc = 2v 1.9 2 i oh = -50 a, v cc = 3v 2.9 3 i oh = -50 a, v cc = 4.5v 4.4 4.5 i oh = -4 ma, v cc = 3v 2.58 high-level output voltage v oh i oh = -8 ma, v cc = 4.5v 3.94 v i oh = 50 a, v cc = 2v 0.1 i oh = 50 a, v cc = 3v 0.1 i oh = 50 a, v cc = 4.5v 0.1 i oh = 4 ma, v cc = 3v 0.36 low-level output voltage v ol i oh = 8 ma, v cc = 4.5v 0.36 v input leakage current (a or b inputs) i i(leak) v in = 5.5v or gnd, v cc = 0 to 5.5v 0.1 a quiescent supply current i cc v in = v cc or gnd, i out = 0, v cc = 5.5v 4 a input capacitance c in v in = v cc or gnd, v cc =5v 2 10 pf
u74ahc157 cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-626.a ? switching characteristics v cc = 3.3v 0.3v, t a =25c parameter symbol test conditions min typ max unit c l =15pf, r l =1k ? 6.2 9.7 t plh c l =50pf, r l =1k ? 8.7 13.2 ns c l =15pf, r l =1k ? 6.2 9.7 propagation delay from input a or b to output y, t pd t phl c l =50pf, r l =1k ? 8.7 13.2 ns c l =15pf, r l =1k ? 8.4 13.2 t plh c l =50pf, r l =1k ? 10.9 16.7 ns c l =15pf, r l =1k ? 8.4 13.2 propagation delay from input a/ b to output y, t pd t phl c l =50pf, r l =1k ? 10.9 16.7 ns c l =15pf, r l =1k ? 8.7 13.6 t plh c l =50pf, r l =1k ? 11.2 17.1 ns c l =15pf, r l =1k ? 8.7 13.6 propagation delay from input g to output y, t pd t phl c l =50pf, r l =1k ? 11.2 17.1 ns v cc = 5v 0.5v, t a =25c parameter symbol test conditions min typ max unit c l =15pf, r l =1k ? 4.1 6.4 t plh c l =50pf, r l =1k ? 5.6 8.4 ns c l =15pf, r l =1k ? 4.1 6.4 propagation delay from input a or b to output y, t pd t phl c l =50pf, r l =1k ? 5.6 8.4 ns c l =15pf, r l =1k ? 5.3 8.1 t plh c l =50pf, r l =1k ? 6.8 10.1 ns c l =15pf, r l =1k ? 5.3 8.1 propagation delay from input a/ b to output y, t pd t phl c l =50pf, r l =1k ? 6.8 10.1 ns c l =15pf, r l =1k ? 5.6 8.6 t plh c l =50pf, r l =1k ? 7.1 10.6 ns c l =15pf, r l =1k ? 5.6 8.6 propagation delay from input g to output y, t pd t phl c l =50pf, r l =1k ? 7.1 10.6 ns ? operating characteristics (t a =25c) parameter symbol test conditions ratings unit power dissipation capacitance c pd v cc = 5v, f=1mhz, no load 11 pf
u74ahc157 cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-626.a ? test circuit and waveforms test s1 t plh /t phl open t plz /t pzl v load t phz /t pzh gnd input v cc v in t r , t f v m v load c l r l v 15pf 3.3v0.3v v cc 3ns v cc /2 v cc 50pf 1k ? 0.3v 15pf 5v0.5v v cc 3ns v cc /2 v cc 50pf 1k ? 0.5v v m v in 0 v pulse duration t w input v m v in 0v setup and hold times t su v m timing input data input t h v m v m
u74ahc157 cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-626.a ? test circuit and waveforms(cont.) 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 ? . 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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