mc74vhc138 3-to-8 line decoder the mc74vhc138 is an advanced high speed cmos 3 ? to ? 8 decoder fabricated with silicon gate cmos technology. it achieves high speed operation similar to equivalent bipolar schottky ttl while maintaining cmos low power dissipation. when the device is enabled, three binary select inputs (a0 ? a2) determine which one of the outputs (y0 ? y7 ) will go low. when enable input e3 is held low or either e2 or e1 is held high, decoding function is inhibited and all outputs go high. e3, e2 , and e1 inputs are provided to ease cascade connection and for use as an address decoder for memory systems. the internal circuit is composed of three stages, including a buffer output which provides high noise immunity and stable output. the inputs tolerate voltages up to 7v , allowing the interface of 5v systems to 3v systems. ? high speed: t pd = 5.7ns (typ) at v cc = 5 v ? low power dissipation: i cc = 4 a (max) at t a = 25 c ? high noise immunity: v nih = v nil = 28% v cc ? power down protection provided on inputs ? balanced propagation delays ? designed for 2 v to 5.5 v operating range ? low noise: v olp = 0.8 v (max) ? pin and function compatible with other standard logic families ? latchup performance exceeds 300 ma ? esd performance: hbm > 2000 v; machine model > 200 v ? chip complexity: 122 fets or 30.5 equivalent gates ? these devices are pb ? free and are rohs compliant ? semiconductor components industries, llc, 2011 may, 2011 ? rev. 5 1 publication order number: mc74vhc138/d device package shipping ordering information MC74VHC138DG soic ? 16 48 units/rail mc74vhc138dr2g soic ? 16 http://onsemi.com 2500 units/reel soic ? 16 d suffix case 751b tssop ? 16 dt suffix case 948f marking diagrams 1 8 9 16 1 8 16 9 vhc138g awlyww vhc138 = specific device code a = assembly location wl, l = wafer lot y = year ww, w = work week g or = pb ? free package vhc 138 alyw mc74vhc138dtr2g tssop ? 16 2500 units/reel
mc74vhc138 http://onsemi.com 2 pin assignment 13 14 15 16 9 10 11 12 5 4 3 2 1 8 7 6 a0 e1 a2 a1 y7 e3 e2 gnd y3 y2 y1 y0 v cc y5 y4 y6 7 y6 y5 y4 y3 y2 y1 y0 y7 9 10 11 12 13 14 15 3 2 1 e3 e2 a0 a1 a2 active-low outputs select inputs e1 enable inputs 4 5 6 inputs outputs e3 e2 e1 a2 a1 a0 y0 y1 y2 y3 y4 y5 y6 y7 x x h xxxhhhhhhhh x h x xxxhhhhhhhh l x x xxxhhhhhhhh h l l lll lhhhhhhh h l l llhhlhhhhhh h l l lhlhhlhhhhh h l l lhhhhhlhhhh h l l hllhhhhlhhh h l l hlhhhhhhlhh h l l hhlhhhhhhlh h l l hhhhhhhhhhl function table h = high level (steady state); l = low level (steady state); x = don?t care logic diagram
mc74vhc138 http://onsemi.com 3 a0 a1 a2 e2 e1 e3 1 2 3 4 5 6 15 14 13 12 11 10 9 7 y1 y2 y3 y4 y5 y6 y7 y0 expanded logic diagram 15 iec logic diagram y0 y1 y2 y3 y4 y5 y6 y7 14 13 12 11 10 9 7 4 5 6 3 2 1 a0 a1 a2 e3 e2 e1 2 1 4 bin/oct 1 0 2 4 3 5 6 7 en & 15 y0 y1 y2 y3 y4 y5 y6 y7 14 13 12 11 10 9 7 4 5 6 3 2 1 a0 a1 a2 e3 e2 e1 0 2 dmux 1 0 2 4 3 5 6 7 & g 0 7
mc74vhc138 http://onsemi.com 4 ??????????????????????? ??????????????????????? ???? ???? ?????????????? ?????????????? ????? ????? ??? ??? ???? ???? v cc ?????????????? ?????????????? ????? ????? ??? ??? ???? ???? ?????????????? ?????????????? ????? ????? ??? ??? ???? ???? ?????????????? ?????????????? ????? ????? ??? ??? ???? ???? ?????????????? ?????????????? ????? ????? ? 20 ??? ??? ???? ???? ?????????????? ?????????????? ????? ????? 20 ??? ??? ???? ???? ?????????????? ?????????????? ????? ????? 25 ??? ??? ???? ???? ?????????????? ?????????????? ????? ????? 75 ??? ??? ???? ???? ???? ?????????????? ?????????????? ?????????????? ????? ????? ????? ??? ??? ??? ???? ???? ?????????????? ?????????????? ????? ????? ??? ??? c * absolute maximum continuous ratings are those values beyond which damage to the device may occur. exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. functional operation under absolute ? maximum ? rated conditions is not implied. ?derating ? soic packages: ? 7 mw/ c from 65 to 125 c tssop package: ? 6.1 mw/ c from 65 to 125 c recommended operating conditions ???? ???? ??????????????? ??????????????? ??? ??? ?? ?? ??? ??? ???? ???? v cc ??????????????? ??????????????? ??? ??? ?? ?? ??? ??? ???? ???? ??????????????? ??????????????? ??? ??? ?? ?? ??? ??? ???? ???? ??????????????? ??????????????? ??? ??? ?? ?? ??? ??? ???? ???? ??????????????? ??????????????? ??? ??? ? 55 ?? ?? ??? ??? c ???? ???? ???? ??????????????? ??????????????? ??????????????? 0.3v v cc =5.0v 0.5v ??? ??? ??? ?? ?? ?? ??? ??? ??? ja of the package is equal to 1/derating. higher junction temperatures may affect the expected lifetime of the device per the ta ble and figure below. device junction temperature versus time to 0.1% bond failures junction temperature c time, hours time, years 80 1,032,200 117.8 90 419,300 47.9 100 178,700 20.4 110 79,600 9.4 120 37,000 4.2 130 17,800 2.0 140 8,900 1.0 1 1 10 100 1000 time, years normalized failure rate t j = 80 c t j = 90 c t j = 100 c t j = 110 c t j = 130 c t j = 120 c failure rate of plastic = ceramic until intermetallics occur figure 1. failure rate vs. time junction temperature this device contains protection circuitry to guard against damage due to high static voltages or electric fields. however, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high ? impedance cir- cuit. for proper operation, v in and v out should be constrained to the range gnd (v in or v out ) v cc . unused inputs must always be tied to an appropriate logic voltage level (e.g., either gnd or v cc ). unused outputs must be left open.
mc74vhc138 http://onsemi.com 5 ????????????????????????????????? ????????????????????????????????? ???? ???? ???? ?????? ?????? ?????? ?????? ?????? ?????? ??? ??? ??? ???????? ???????? c ????? ????? 85 c ?????? ?????? 125 c ?? ?? ?? ??? ??? ???? ???? ??? ??? ??? ??? ??? ??? ???? ???? ??? ??? ???? ???? ???? ???? v ih ?????? ?????? ?????? ?????? ? level input voltage ?????? ?????? ?????? ?????? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ???? ???? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ???? ???? ??? ??? ??? ??? ?? ?? ?? ?? ???? ???? ???? ???? ?????? ?????? ?????? ?????? ? level input voltage ?????? ?????? ?????? ?????? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ???? ???? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ???? ???? ??? ??? ??? ??? ?? ?? ?? ?? ???? ???? ???? ???? ???? ?????? ?????? ?????? ?????? ?????? ? level output voltage v in = v ih or v il ?????? ?????? ?????? ? 50 a ??? ??? ??? 2.0 3.0 4.5 ??? ??? ??? ???? ???? ???? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ???? ??? ??? ??? ?? ?? ?? ?? ?? ?????? ?????? ?????? ? 4 ma i oh = ? 8 ma ??? ??? ??? ??? ??? ??? ???? ???? ???? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? ???? ???? ???? ?????? ?????? ?????? ?????? ?????? ?????? ? level output voltage v in = v ih or v il ?????? ?????? ?????? ?????? a ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ???? ???? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ???? ???? ??? ??? ??? ??? ?? ?? ?? ?? ?? ?? ?????? ?????? ?????? ??? ??? ??? ??? ??? ??? ???? ???? ???? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? ?????? ?????? ?????? ?????? ?????? ?????? ??? ??? ??? ??? ??? ??? ???? ???? ???? ??? ??? ??? 0.1 ??? ??? ??? ??? ??? ??? 1.0 ???? ???? ???? ??? ??? ??? 1.0 ?? ?? ?? a ???? ???? ?????? ?????? ?????? ?????? ??? ??? ??? ??? ???? ???? ??? ??? ??? ??? ??? ??? ???? ???? ??? ??? ?? ?? a ????????????????????????????????? ????????????????????????????????? ac electrical characteristics (input t r = t f = 3.0ns) ???? ???? ???? ???? symbo l ?????? ?????? ?????? ?????? ????????? ????????? ????????? ????????? ??????? ??????? ??????? c ????? ????? ????? ? 40 to 85 c ?????? ?????? ?????? ? 55 to 125 c ?? ?? ?? ?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ??? ??? ???? ???? ???? ???? t plh , t phl ?????? ?????? ?????? ?????? ????????? ????????? 0.3v c l = 15pf c l = 50pf ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ??? ??? ?? ?? ?? ?? ????????? ????????? ????????? 0.5v c l = 15pf c l = 50pf ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ???? ???? ?????? ?????? ?????? ?????? ????????? ????????? ????????? 0.3v c l = 15pf c l = 50pf ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ???? ??? ??? ??? ?? ?? ?? ?? ????????? ????????? 0.5v c l = 15pf c l = 50pf ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ??? ??? ???? ???? ???? ???? ???? ?????? ?????? ?????? ?????? ?????? ????????? ????????? ????????? 0.3v c l = 15pf c l = 50pf ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ???? ??? ??? ??? ?? ?? ?? ?? ?? ????????? ????????? ????????? 0.5v c l = 15pf c l = 50pf ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ???? ??? ??? ??? ???? ???? ?????? ?????? ????????? ????????? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ??? ??? ?? ?? typical @ 25 c, v cc = 5.0v pf 34 1. c pd is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption with out load. average operating current can be obtained by the equation: i cc(opr ) = c pd v cc f in + i cc . c pd is used to determine the no ? load dynamic power consumption; p d = c pd v cc 2 f in + i cc v cc .
mc74vhc138 http://onsemi.com 6 figure 2. 50% t phl t plh v cc gnd valid valid y 50% v cc v cc gnd t plh 50% v cc y e3 t phl 50% a switching waveforms figure 3. v cc gnd t phl t plh y e2 or e1 50% v cc 50% figure 4. *includes all probe and jig capacitance figure 5. test circuit c l * test point device under test output input figure 6. input equivalent circuit
mc74vhc138 http://onsemi.com 7 package dimensions soic ? 16 case 751b ? 05 issue k notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimensions a and b do not include mold protrusion. 4. maximum mold protrusion 0.15 (0.006) per side. 5. dimension d does not include dambar protrusion. allowable dambar protrusion shall be 0.127 (0.005) total in excess of the d dimension at maximum material condition. 18 16 9 seating plane f j m r x 45 g 8 pl p ? b ? ? a ? m 0.25 (0.010) b s ? t ? d k c 16 pl s b m 0.25 (0.010) a s t dim min max min max inches millimeters a 9.80 10.00 0.386 0.393 b 3.80 4.00 0.150 0.157 c 1.35 1.75 0.054 0.068 d 0.35 0.49 0.014 0.019 f 0.40 1.25 0.016 0.049 g 1.27 bsc 0.050 bsc j 0.19 0.25 0.008 0.009 k 0.10 0.25 0.004 0.009 m 0 7 0 7 p 5.80 6.20 0.229 0.244 r 0.25 0.50 0.010 0.019 6.40 16x 0.58 16x 1.12 1.27 dimensions: millimeters 1 pitch soldering footprint 16 89 8x
mc74vhc138 http://onsemi.com 8 package dimensions tssop ? 16 case 948f ? 01 issue b ??? ??? ??? dim min max min max inches millimeters a 4.90 5.10 0.193 0.200 b 4.30 4.50 0.169 0.177 c ??? 1.20 ??? 0.047 d 0.05 0.15 0.002 0.006 f 0.50 0.75 0.020 0.030 g 0.65 bsc 0.026 bsc h 0.18 0.28 0.007 0.011 j 0.09 0.20 0.004 0.008 j1 0.09 0.16 0.004 0.006 k 0.19 0.30 0.007 0.012 k1 0.19 0.25 0.007 0.010 l 6.40 bsc 0.252 bsc m 0 8 0 8 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimension a does not include mold flash. protrusions or gate burrs. mold flash or gate burrs shall not exceed 0.15 (0.006) per side. 4. dimension b does not include interlead flash or protrusion. interlead flash or protrusion shall not exceed 0.25 (0.010) per side. 5. dimension k does not include dambar protrusion. allowable dambar protrusion shall be 0.08 (0.003) total in excess of the k dimension at maximum material condition. 6. terminal numbers are shown for reference only. 7. dimension a and b are to be determined at datum plane ? w ? . section n ? n seating plane ident. pin 1 1 8 16 9 detail e j j1 b c d a k k1 h g ? u ? s u 0.15 (0.006) t s u 0.15 (0.006) t s u m 0.10 (0.004) v s t 0.10 (0.004) ? t ? ? v ? ? w ? 0.25 (0.010) 16x ref k n n 7.06 16x 0.36 16x 1.26 0.65 dimensions: millimeters 1 pitch soldering footprint on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5773 ? 3850 mc74vhc138/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative
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