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? semiconductor components industries, llc, 2001 may, 2001 rev. 5 1 publication order number: mc74ac138/d mc74ac138, mc74act138 1-of-8 decoder/demultiplexer the mc74ac138/74act138 is a highspeed 1of8 decoder/demultiplexer . this device is ideally suited for highspeed bipolar memory chip select address decoding. the multiple input enables allow parallel expansion to a 1of24 decoder using just three mc74ac138/74act138 devices or a 1of32 decoder using four mc74ac138/74act138 devices and one inverter. ? demultiplexing capability ? multiple input enable for easy expansion ? active low mutually exclusive outputs ? outputs source/sink 24 ma ? act138 has ttl compatible inputs v cc gnd a 0 a 1 a 2 e 1 e 2 e 3 15 16 14 13 12 11 10 2 1 34567 9 8 o 7 o 0 o 1 o 2 o 3 o 4 o 5 o 6 figure 1. pinout: 16lead packages conductors (top view) figure 2. logic symbol a 0 a 1 a 2 e 1 e 2 e 3 o 1 o 2 o 3 o 4 o 5 o 6 o 7 o 0 pin assignment pin function a 0 a 2 address inputs e 1 e 2 enable inputs e 3 enable input o 0 o 7 outputs http://onsemi.com dip16 n suffix case 648 1 16 so16 d suffix case 751b 1 16 device package shipping ordering information mc74ac138n pdip16 25 units/rail mc74ac138d soic16 48 units/rail mc74ac138dr2 2500 tape & reel tssop16 dt suffix case 948f mc74ac138dt tssop16 96 units/rail mc74ac138dtr2 tssop16 soic16 2500 tape & reel mc74act138n pdip16 25 units/rail mc74act138d soic16 48 units/rail mc74act138dr2 2500 tape & reel mc74act138dt tssop16 96 units/rail mc74act138dtr2 tssop16 soic16 2500 tape & reel 1 16 see general marking information in the device marking section on page 6 of this data sheet. device marking information 1 16 eiaj16 m suffix case 966 mc74ac138m eiaj16 mc74ac138mel eiaj16 2000 tape & reel mc74act138m eiaj16 mc74act138mel eiaj16 2000 tape & reel 50 units/rail 50 units/rail
mc74ac138, mc74act138 http://onsemi.com 2 functional description the mc74ac138/74act138 highspeed 1of8 decoder/demultiplexer accepts three binary weighted inputs (a 0 , a 1 , a 2 ) and, when enabled, provides eight mutually exclusive activelow outputs (o 0 o 7 ). the mc74ac138/74act138 features three enable inputs, two activelow (e 1 , e 2 ) and one activehigh (e 3 ). all outputs will be high unless e 1 and e 2 are low and e 3 is high. this multiple enabled function allows easy parallel expansion of the device to a 1of32 (5 lines to 32 lines) decoder with just four mc74ac138/74act138 devices and one inverter (see figure 4). the mc74ac138/74act138 can be used as an 8output demultiplexer by using one of the active low enable inputs as the data input and the other enable inputs as strobes. the enable inputs which are not used must be permanently tied to their appropriate activehigh or activelow state. truth table inputs outputs e 1 e 2 e 3 a 0 a 1 a 2 o 0 o 1 o 2 o 3 o 4 o 5 o 6 o 7 h x x x x x h h h h h h h h x h x x x x h h h h h h h h x x l x x x h h h h h h h h l l h l l l l h h h h h h h l l h h l l h l h h h h h h l l h l h l h h l h h h h h l l h h h l h h h l h h h h l l h l l h h h h h l h h h l l h h l h h h h h h l h h l l h l h h h h h h h h l h l l h h h h h h h h h h h l h = high voltage level l = low voltage level x = immaterial a 2 a 1 a 0 e 3 e 1 e 2 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 note: this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. figure 3. logic diagram
mc74ac138, mc74act138 http://onsemi.com 3 h 123 123 123 123 a 0 a 2 a 3 a 4 a 0 a 1 a 2 e 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 a 0 a 1 a 2 e 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 a 0 a 1 a 2 e 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 a 0 a 1 a 2 e 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 0 0 31 04 figure 4. expansion to 1of32 decoding a 1 maximum ratings* symbol parameter value unit v cc dc supply voltage (referenced to gnd) 0.5 to +7.0 v v in dc input voltage (referenced to gnd) 0.5 to v cc +0.5 v v out dc output voltage (referenced to gnd) 0.5 to v cc +0.5 v i in dc input current, per pin 20 ma i out dc output sink/source current, per pin 50 ma i cc dc v cc or gnd current per output pin 50 ma t stg storage t emperature 65 to +150 c *maximum ratings are those values beyond which damage to the device may occur. functional operation should be restricted to the recom- mended operating conditions. recommended operating conditions symbol parameter min typ max unit v cc supply voltage ac 2.0 5.0 6.0 v v cc supply voltage act 4.5 5.0 5.5 v v in , v out dc input voltage, output voltage (ref. to gnd) 0 v cc v v cc @ 3.0 v 150 t r , t f input rise and fall time (note 1) ac devices exce p t schmitt in p uts v cc @ 4.5 v 40 ns/v r , f ac devices except schmitt inputs v cc @ 5.5 v 25 tt f input rise and fall time (note 2) v cc @ 4.5 v 10 ns/v t r , t f in ut rise and fall time (note 2) act devices except schmitt inputs v cc @ 5.5 v 8.0 ns/v t j junction temperature (pdip) 140 c t a operating ambient temperature range 40 25 85 c i oh output current high 24 ma i ol output current low 24 ma 1. v in from 30% to 70% v cc ; see individual data sheets for devices that differ from the typical input rise and fall times. 2. v in from 0.8 v to 2.0 v; see individual data sheets for devices that differ from the typical input rise and fall times.
mc74ac138, mc74act138 http://onsemi.com 4 dc characteristics 74ac 74ac symbol parameter v cc (v) t a = +25 c t a = 40 c to +85 c unit conditions typ guaranteed limits v ih minimum high level 3.0 1.5 2.1 2.1 v out = 0.1 v g input v oltage 4.5 2.25 3.15 3.15 v or v cc 0.1 v 5.5 2.75 3.85 3.85 v il maximum low level 3.0 1.5 0.9 0.9 v out = 0.1 v input v oltage 4.5 2.25 1.35 1.35 v or v cc 0.1 v 5.5 2.75 1.65 1.65 v oh minimum high level 3.0 2.99 2.9 2.9 i out = 50 m a g output voltage 4.5 4.49 4.4 4.4 v 5.5 5.49 5.4 5.4 *v in = v il or v ih 3.0 2.56 2.46 v 12 ma 4.5 3.86 3.76 v i oh 24 ma 5.5 4.86 4.76 24 ma v ol maximum low level 3.0 0.002 0.1 0.1 i out = 50 m a output voltage 4.5 0.001 0.1 0.1 v 5.5 0.001 0.1 0.1 *v in = v il or v ih 3.0 0.36 0.44 v 12 ma 4.5 0.36 0.44 v i ol 24 ma 5.5 0.36 0.44 24 ma i in maximum input 55 01 10 m a v i =v cc gnd leakage current 5.5 0 . 1 1 . 0 m a v i = v cc , gnd i old 2minimum dynamic ot tc t 5.5 75 ma v old = 1.65 v max i ohd output current 5.5 75 ma v ohd = 3.85 v min i cc maximum quiescent 55 80 80 m a v in =v cc or gnd q supply current 5.5 8 . 0 80 m a v in = v cc or gnd *all outputs loaded; thresholds on input associated with output under test. 2maximum test duration 2.0 ms, one output loaded at a time. note: i in and i cc @ 3.0 v are guaranteed to be less than or equal to the respective limit @ 5.5 v v cc .
mc74ac138, mc74act138 http://onsemi.com 5 ac characteristics (for figures and waveforms see section 3 of the on semiconductor fact data book, dl138/d) 74ac 74ac symbol parameter v cc * (v) t a = +25 c c l = 50 pf t a = 40 c to +85 c c l = 50 pf unit fig. no. min typ max min max t plh propagation delay 3.3 1.5 8.5 13.0 1.5 15.0 ns 3 6 t plh gy a n to o n 5.0 1.5 6.5 9.5 1.5 10.5 ns 3 6 t phl propagation delay 3.3 1.5 8.0 12.5 1.5 14.0 ns 3 6 t phl gy a n to o n 5.0 1.5 6.0 9.0 1.5 10.5 ns 3 6 t plh propagation delay 3.3 1.5 11.0 15.0 1.5 16.0 ns 3 6 t plh gy e 1 or e 2 to o n 5.0 1.5 8.0 11.0 1.5 12.0 ns 3 6 t phl propagation delay 3.3 1.5 9.5 13.5 1.5 15.0 ns 3 6 t phl gy e 1 or e 2 to o n 5.0 1.5 7.0 9.5 1.5 10.5 ns 3 6 t plh propagation delay 3.3 1.5 11.0 15.5 1.5 16.5 ns 3 6 t plh gy e 3 to o n 5.0 1.5 8.0 11.0 1.5 12.5 ns 3 6 t phl propagation delay 3.3 1.5 8.5 13.0 1.5 14.0 ns 3 6 t phl gy e 3 to o n 5.0 1.5 6.0 8.0 1.0 9.5 ns 3 6 *voltage range 3.3 v is 3.3 v 0.3 v. *voltage range 5.0 v is 5.0 v 0.5 v. dc characteristics 74act 74act symbol parameter v cc (v) t a = +25 c t a = 40 c to +85 c unit conditions typ guaranteed limits v ih minimum high level 4.5 1.5 2.0 2.0 v v out = 0.1 v g input v oltage 5.5 1.5 2.0 2.0 v or v cc 0.1 v v il maximum low level 4.5 1.5 0.8 0.8 v v out = 0.1 v input v oltage 5.5 1.5 0.8 0.8 v or v cc 0.1 v v oh minimum high level 4.5 4.49 4.4 4.4 v i out = 50 m a g output voltage 5.5 5.49 5.4 5.4 v *v in = v il or v ih 4.5 3.86 3.76 v i oh 24 ma 5.5 4.86 4.76 i oh 24 ma v ol maximum low level 4.5 0.001 0.1 0.1 v i out = 50 m a output voltage 5.5 0.001 0.1 0.1 v *v in = v il or v ih 4.5 0.36 0.44 v i ol 24 ma 5.5 0.36 0.44 i ol 24 ma i in maximum input 55 01 10 m a v i =v cc gnd leakage current 5.5 0 . 1 1 . 0 m a v i = v cc , gnd d i cct additional max. i cc /input 5.5 0.6 1.5 ma v i = v cc 2.1 v i old 2minimum dynamic ot tc t 5.5 75 ma v old = 1.65 v max i ohd output current 5.5 75 ma v ohd = 3.85 v min i cc maximum quiescent 55 80 80 m a v in =v cc or gnd q supply current 5.5 8 . 0 80 m a v in = v cc or gnd *all outputs loaded; thresholds on input associated with output under test. 2maximum test duration 2.0 ms, one output loaded at a time.
mc74ac138, mc74act138 http://onsemi.com 6 ac characteristics (for figures and waveforms see section 3 of the on semiconductor fact data book, dl138/d) 74act 74act symbol parameter v cc * (v) t a = +25 c c l = 50 pf t a = 40 c to +85 c c l = 50 pf unit fig. no. min typ max min max t plh propagation delay 50 15 70 10 5 15 11 5 ns 3 6 t plh pro agation delay a n to o n 5. 0 1 .5 7. 0 10 .5 1 .5 11 .5 ns 3 6 t phl propagation delay 50 15 65 10 5 15 11 5 ns 3 6 t phl pro agation delay a n to o n 5. 0 1 .5 6 .5 10 .5 1 .5 11 .5 ns 3 6 t plh propagation delay 50 25 80 11 5 20 12 5 ns 3 6 t plh pro agation delay e 1 or e 2 to o n 5. 0 2 .5 8 . 0 11 .5 2 . 0 12 .5 ns 3 6 t phl propagation delay 50 20 75 11 5 20 12 5 ns 3 6 t phl pro agation delay e 1 or e 2 to o n 5. 0 2 . 0 7.5 11 .5 2 . 0 12 .5 ns 3 6 t plh propagation delay 50 25 80 12 0 20 13 0 ns 3 6 t plh pro agation delay e 3 to o n 5. 0 2 .5 8 . 0 12 . 0 2 . 0 13 . 0 ns 3 6 t phl propagation delay 50 20 65 10 5 15 11 5 ns 3 6 t phl pro agation delay e 3 to o n 5. 0 2 . 0 6 .5 10 .5 1 .5 11 .5 ns 3 6 *voltage range 5.0 v is 5.0 v 0.5 v capacitance symbol parameter value typ unit test conditions c in input capacitance 4.5 pf v cc = 5.0 v c pd power dissipation capacitance 60 pf v cc = 5.0 v marking diagrams a = assembly location wl, l = wafer lot yy, y = year ww, w = work week ac138 awlyww mc74ac138n awlyyww ac 138 alyw act138 awlyww act 138 alyw mc74act138n awlyyww dip16 so16 tssop16 eiaj16 74ac138 alyw 74act138 alyw
mc74ac138, mc74act138 http://onsemi.com 7 package dimensions notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: inch. 3. dimension l to center of leads when formed parallel. 4. dimension b does not include mold flash. 5. rounded corners optional. a b f c s h g d j l m 16 pl seating 18 9 16 k plane t m a m 0.25 (0.010) t dim min max min max millimeters inches a 0.740 0.770 18.80 19.55 b 0.250 0.270 6.35 6.85 c 0.145 0.175 3.69 4.44 d 0.015 0.021 0.39 0.53 f 0.040 0.70 1.02 1.77 g 0.100 bsc 2.54 bsc h 0.050 bsc 1.27 bsc j 0.008 0.015 0.21 0.38 k 0.110 0.130 2.80 3.30 l 0.295 0.305 7.50 7.74 m 0 10 0 10 s 0.020 0.040 0.51 1.01 pdip16 n suffix 16 pin plastic dip package case 64808 issue r 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 so16 d suffix 16 pin plastic soic package case 751b05 issue j
mc74ac138, mc74act138 http://onsemi.com 8 package dimensions tssop16 dt suffix 16 pin plastic tssop package case948f01 issue o ??? ??? 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 nn seating plane ident. pin 1 1 8 16 9 detail e j j1 b c d a k k1 h g detail e f m l 2x l/2 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 eiaj16 m suffix 16 pin plastic eiaj package case96601 issue o h e a 1 dim min max min max inches --- 2.05 --- 0.081 millimeters 0.05 0.20 0.002 0.008 0.35 0.50 0.014 0.020 0.18 0.27 0.007 0.011 9.90 10.50 0.390 0.413 5.10 5.45 0.201 0.215 1.27 bsc 0.050 bsc 7.40 8.20 0.291 0.323 0.50 0.85 0.020 0.033 1.10 1.50 0.043 0.059 0 0.70 0.90 0.028 0.035 --- 0.78 --- 0.031 a 1 h e q 1 l e 10 0 10 l e q 1 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimensions d and e do not include mold flash or protrusions and are measured at the parting line. mold flash or protrusions shall not exceed 0.15 (0.006) per side. 4. terminal numbers are shown for reference only. 5. the lead width dimension (b) does not include dambar protrusion. allowable dambar protrusion shall be 0.08 (0.003) total in excess of the lead width dimension at maximum material condition. dambar cannot be located on the lower radius or the foot. minimum space between protrusions and adjacent lead to be 0.46 ( 0.018). m l detail p view p c a b e m 0.13 (0.005) 0.10 (0.004) 1 16 9 8 d z e a b c d e e l m z
mc74ac138, mc74act138 http://onsemi.com 9 notes
mc74ac138, mc74act138 http://onsemi.com 10 notes
mc74ac138, mc74act138 http://onsemi.com 11 notes
mc74ac138, mc74act138 http://onsemi.com 12 on semiconductor and are trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to make changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any 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 without limitation special, consequential or incidental damages. atypicalo parameters which may be provided in scill c data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including atypicalso 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 t he 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 indem nify and hold scillc and its of ficers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and re asonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized u se, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employ er. publication ordering information japan : on semiconductor, japan customer focus center 4321 nishigotanda, shinagawaku, tokyo, japan 1410031 phone : 81357402700 email : r14525@onsemi.com on semiconductor website : http://onsemi.com for additional information, please contact your local sales representative. mc74ac138/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 3036752175 or 8003443860 toll free usa/canada fax : 3036752176 or 8003443867 toll free usa/canada email : onlit@hibbertco.com n. american technical support : 8002829855 toll free usa/canada

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