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sn54als138a, sn54as138, sn74als138a, sn74as138 3-line to 8-line decoders/demultiplexers sdas055e april 1982 revised july 1996 1 post office box 655303 ? dallas, texas 75265 designed specifically for high-speed memory decoders and data transmission systems incorporate three enable inputs to simplify cascading and /or data reception package options include plastic small-outline (d) packages, ceramic chip carriers (fk), and standard plastic (n) and ceramic (j) 300-mil dips description the als138a and as138 are 3-line to 8-line decoders/demultiplexers designed for high- performance memory-decoding or data-routing applications requiring very short propagation delay times. in high-performance systems, these devices can be used to minimize the effects of system decoding. when employed with high-speed memories with a fast enable circuit, the delay times of the decoder and the enable time of the memory are usually less than the typical access time of the memory. the effective system delay introduced by the schottky-clamped system decoder is negligible. the conditions at the binary-select (a, b, and c) inputs and the three enable (g1, g2a , and g2b ) inputs select one of eight output lines. two active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding. a 24-line decoder can be implemented without external inverters and a 32-line decoder requires only one inverter. an enable input can be used as a data input for demultiplexing applications. the sn54als138a and sn54as138 are characterized for operation over the full military temperature range of 55 c to 125 c. the sn74als138a and sn74as138 are characterized for operation from 0 c to 70 c. copyright ? 1996, texas instruments incorporated production data information is current as of publication date. products conform to specifications per the terms of texas instruments standard warranty. production processing does not necessarily include testing of all parameters. sn54als138a, sn54as138 ...j p ackage sn74als138a, sn74as138 ...d or n p ackage (top view) 3 2 1 20 19 910111213 4 5 6 7 8 18 17 16 15 14 y1 y2 nc y3 y4 c g2a nc g2b g1 sn54als138a, sn54as138 . . . fk package (top view) b a nc y6 y5 y0 y7 gnd nc nc no internal connection v cc 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 a b c g2a g2b g1 y7 gnd v cc y0 y1 y2 y3 y4 y5 y6 please be aware that an important notice concerning availability, standard warranty, and use in critical applications of texas instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
sn54als138a, sn54as138, sn74als138a, sn74as138 3-line to 8-line decoders/demultiplexers sdas055e april 1982 revised july 1996 2 post office box 655303 ? dallas, texas 75265 function table inputs outputs enable select outputs g1 g2a g2b c b a y0 y1 y2 y3 y4 y5 y6 y7 x h x x x x h h h h h h h h x xhx xxh hhhhhhh l xxx xxh hhhhhhh h lll lll hhhhhhh h lll lhh lhhhhhh h lll hlh hlhhhhh h lll hhh hhlhhhh h llh llh hhhlhhh h llh lhh hhhhlhh h llh hlh hhhhhlh h l l h h h h h h h h h h l logic symbols (alternatives) 2 bin/oct 1 1 a 2 2 b 4 3 c 4 5 6 g1 y0 15 0 & en y1 14 1 y2 13 2 y3 12 3 y4 11 4 y5 10 5 y6 9 6 y7 7 7 dmux 0 1 a 2 b 2 3 c 4 5 6 g1 y0 15 0 & y1 14 1 y2 13 2 y3 12 3 y4 11 4 y5 10 5 y6 9 6 y7 7 7 g 7 0 g2a g2b g2a g2b 2 these symbols are in accordance with ansi/ieee std 91-1984 and iec publication 617-12. pin numbers shown are for the d, j, and n packages.
sn54als138a, sn54as138, sn74als138a, sn74as138 3-line to 8-line decoders/demultiplexers sdas055e april 1982 revised july 1996 3 post office box 655303 ? dallas, texas 75265 logic diagram (positive logic) g2b g2a g1 c b a y7 y6 y5 y4 y3 y2 y1 y0 data outputs select inputs enable inputs 1 2 3 6 4 5 15 14 13 12 11 10 9 7 pin numbers shown are for the d, j, and n packages.
sn54als138a, sn54as138, sn74als138a, sn74as138 3-line to 8-line decoders/demultiplexers sdas055e april 1982 revised july 1996 4 post office box 655303 ? dallas, texas 75265 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) 2 supply voltage, v cc 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input voltage, v i 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operating free-air temperature range, t a : sn54als138a 55 c to 125 c . . . . . . . . . . . . . . . . . . . . . . . . . . . sn74als138a 0 c to 70 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range, t stg 65 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 stresses beyond those listed under aabsolute maximum ratingso may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated under arecommended operating conditi onso is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. recommended operating conditions sn54als138a sn74als138a unit min nom max min nom max unit v cc supply voltage 4.5 5 5.5 4.5 5 5.5 v v ih high-level input voltage 2 2 v v il low-level input voltage 0.7 0.8 v i oh high-level output current 0.4 0.4 ma i ol low-level output current 4 8 ma t a operating free-air temperature 55 125 0 70 c electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) parameter test conditions sn54als138a sn74als138a unit parameter test conditions min typ 3 max min typ 3 max unit v ik v cc = 4.5 v, i i = 18 ma 1.5 1.5 v v oh v cc = 4.5 v, i oh = 0.4 ma v cc 2 v cc 2 v v ol v cc =45v i ol = 4 ma 0.25 0.4 0.25 0.4 v v ol v cc = 4 . 5 v i ol = 8 ma 0.35 0.5 v i i v cc = 5.5 v, v i = 7 v 0.1 0.1 ma i ih v cc = 5.5 v, v i = 2.7 v 20 20 m a i il v cc = 5.5 v, v i = 0.4 v 0.1 0.1 ma i o v cc = 5.5 v, v o = 2.25 v 20 112 30 112 ma i cc v cc = 5.5 v 5 10 5 10 ma 3 all typical values are at v cc = 5 v, t a = 25 c. the output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, i os . switching characteristics (see figure 1) parameter from ( input ) to ( output ) v cc = 4.5 v to 5.5 v, c l = 50 pf, r l = 500 w , t a = min to max ? unit (input) (output) sn54als138a sn74als138a min max min max t plh abc any y 2 28 5 22 ns t phl a , b , c an y y 6 22 6 18 ns t plh gorg any y 2 22 3 17 ns t phl g or g an y y 4 21 4 17 ns ? for conditions shown as min or max, use the appropriate value specified under recommended operating conditions.
sn54als138a, sn54as138, sn74als138a, sn74as138 3-line to 8-line decoders/demultiplexers sdas055e april 1982 revised july 1996 5 post office box 655303 ? dallas, texas 75265 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) 2 supply voltage, v cc 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input voltage, v i 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operating free-air temperature range, t a : sn54as138 55 c to 125 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . sn74as138 0 c to 70 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range, t stg 65 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 stresses beyond those listed under aabsolute maximum ratingso may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated under arecommended operating conditi onso is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. recommended operating conditions sn54as138 sn74as138 unit min nom max min nom max unit v cc supply voltage 4.5 5 5.5 4.5 5 5.5 v v ih high-level input voltage 2 2 v v il low-level input voltage 0.8 0.8 v i oh high-level output current 2 2 ma i ol low-level output current 20 20 ma t a operating free-air temperature 55 125 0 70 c electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) parameter test conditions sn54as138 sn74as138 unit parameter test conditions min typ 3 max min typ 3 max unit v ik v cc = 4.5 v, i i = 18 ma 1.2 1.2 v v oh v cc = 4.5 v to 5.5 v, i oh = 2 ma v cc 2 v cc 2 v v ol v cc = 4.5 v, i ol = 20 ma 0.35 0.5 0.35 0.5 v i i v cc = 5.5 v, v i = 7 v 0.1 0.1 ma i ih v cc = 5.5 v, v i = 2.7 v 20 20 m a i il v cc = 5.5 v, v i = 0.4 v 0.5 0.5 ma i o v cc = 5.5 v, v o = 2.25 v 30 112 30 112 ma i cch v cc = 5.5 v 12 17.5 12 17.5 ma i ccl v cc = 5.5 v 14 20 14 20 ma 3 all typical values are at v cc = 5 v, t a = 25 c. the output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, i os .
sn54als138a, sn54as138, sn74als138a, sn74as138 3-line to 8-line decoders/demultiplexers sdas055e april 1982 revised july 1996 6 post office box 655303 ? dallas, texas 75265 switching characteristics (see figure 1) parameter from ( input ) to ( output ) v cc = 4.5 v to 5.5 v, c l = 50 pf, r l = 500 w , t a = min to max 2 unit (input) (output) sn54as138 sn74as138 min max min max t plh abc any y 2 11 2 10 ns t phl a , b , c an y y 2 11 2 9.5 ns t plh g1 any y 2 11.5 2 10 ns t phl g1 an y y 2 11 2 10 ns t plh g2 any y 2 9 2 7.5 ns t phl g2 an y y 2 10 2 8.5 ns 2 for conditions shown as min or max, use the appropriate value specified under recommended operating conditions.
sn54als138a, sn54as138, sn74als138a, sn74as138 3-line to 8-line decoders/demultiplexers sdas055e april 1982 revised july 1996 7 post office box 655303 ? dallas, texas 75265 parameter measurement information series 54als/74als and 54as/74as devices t phz t plz t phl t plh 0.3 v t pzl t pzh t plh t phl load circuit for 3-state outputs from output under test test point r1 s1 c l (see note a) 7 v 1.3 v 1.3 v 1.3 v 3.5 v 3.5 v 0.3 v 0.3 v t h t su voltage waveforms setup and hold times timing input data input 1.3 v 1.3 v 3.5 v 3.5 v 0.3 v 0.3 v high-level pulse low-level pulse t w voltage waveforms pulse durations input out-of-phase output (see note c) 1.3 v 1.3 v 1.3 v 1.3 v 1.3 v 1.3 v 1.3 v 1.3 v 1.3 v 1.3 v 3.5 v 3.5 v 0.3 v 0.3 v v ol v oh v oh v ol output control (low-level enabling) waveform 1 s1 closed (see note b) waveform 2 s1 open (see note b) 0 v v oh v ol 3.5 v in-phase output 0.3 v 1.3 v 1.3 v voltage waveforms propagation delay times voltage waveforms enable and disable times, 3-state outputs r2 v cc r l test point from output under test c l (see note a) load circuit for open-collector outputs load circuit for bi-state totem-pole outputs from output under test test point c l (see note a) r l r l = r1 = r2 notes: a. c l includes probe and jig capacitance. b. waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. c. when measuring propagation delay items of 3-state outputs, switch s1 is open. d. all input pulses have the following characteristics: prr 1 mhz, t r = t f = 2 ns, duty cycle = 50%. e. the outputs are measured one at a time with one transition per measurement. figure 1. load circuits and voltage waveforms
packaging information orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish msl peak temp (3) 5962-86866012a active lccc fk 20 1 tbd call ti level-nc-nc-nc 5962-8686601fa active cfp w 16 1 tbd call ti level-nc-nc-nc jm38510/37701b2a active lccc fk 20 1 tbd call ti level-nc-nc-nc jm38510/37701bea active cdip j 16 1 tbd call ti level-nc-nc-nc sn54als138aj active cdip j 16 1 tbd call ti level-nc-nc-nc sn54as138j active cdip j 16 1 tbd call ti level-nc-nc-nc SN74ALS138AD active soic d 16 40 green (rohs & no sb/br) cu nipdau level-1-260c-unlim SN74ALS138ADg4 active soic d 16 40 green (rohs & no sb/br) cu nipdau level-1-260c-unlim SN74ALS138ADr active soic d 16 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim SN74ALS138ADrg4 active soic d 16 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim sn74als138an active pdip n 16 25 pb-free (rohs) cu nipdau level-nc-nc-nc sn74als138ane4 active pdip n 16 25 pb-free (rohs) cu nipdau level-nc-nc-nc sn74als138ansr active so ns 16 2000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim sn74als138ansre4 active so ns 16 2000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim sn74as138d active soic d 16 40 green (rohs & no sb/br) cu nipdau level-1-260c-unlim sn74as138de4 active soic d 16 40 green (rohs & no sb/br) cu nipdau level-1-260c-unlim sn74as138dr active soic d 16 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim sn74as138dre4 active soic d 16 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim sn74as138n active pdip n 16 25 pb-free (rohs) cu nipdau level-nc-nc-nc sn74as138n3 obsolete pdip n 16 tbd call ti call ti sn74as138ne4 active pdip n 16 25 pb-free (rohs) cu nipdau level-nc-nc-nc sn74as138nsr active so ns 16 2000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim sn74as138nsre4 active so ns 16 2000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim snj54als138afk active lccc fk 20 1 tbd call ti level-nc-nc-nc snj54als138aj active cdip j 16 1 tbd call ti level-nc-nc-nc snj54als138aw active cfp w 16 1 tbd call ti level-nc-nc-nc snj54as138fk active lccc fk 20 1 tbd call ti level-nc-nc-nc snj54as138j active cdip j 16 1 tbd call ti level-nc-nc-nc (1) the marketing status values are defined as follows: active: product device recommended for new designs. lifebuy: ti has announced that the device will be discontinued, and a lifetime-buy period is in effect. package option addendum www.ti.com 26-sep-2005 addendum-page 1
nrnd: not recommended for new designs. device is in production to support existing customers, but ti does not recommend using this part in a new design. preview: device has been announced but is not in production. samples may or may not be available. obsolete: ti has discontinued the production of the device. (2) eco plan - the planned eco-friendly classification: pb-free (rohs) or green (rohs & no sb/br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. tbd: the pb-free/green conversion plan has not been defined. pb-free (rohs): ti's terms "lead-free" or "pb-free" mean semiconductor products that are compatible with the current rohs requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, ti pb-free products are suitable for use in specified lead-free processes. green (rohs & no sb/br): ti defines "green" to mean pb-free (rohs compatible), and free of bromine (br) and antimony (sb) based flame retardants (br or sb do not exceed 0.1% by weight in homogeneous material) (3) msl, peak temp. -- the moisture sensitivity level rating according to the jedec industry standard classifications, and peak solder temperature. important information and disclaimer: the information provided on this page represents ti's knowledge and belief as of the date that it is provided. ti bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. ti has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ti and ti suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release. in no event shall ti's liability arising out of such information exceed the total purchase price of the ti part(s) at issue in this document sold by ti to customer on an annual basis. package option addendum www.ti.com 26-sep-2005 addendum-page 2

mechanical data mlcc006b october 1996 post office box 655303 ? dallas, texas 75265 fk (s-cqcc-n**) leadless ceramic chip carrier 4040140 / d 10/96 28 terminal shown b 0.358 (9,09) max (11,63) 0.560 (14,22) 0.560 0.458 0.858 (21,8) 1.063 (27,0) (14,22) a no. of min max 0.358 0.660 0.761 0.458 0.342 (8,69) min (11,23) (16,26) 0.640 0.739 0.442 (9,09) (11,63) (16,76) 0.962 1.165 (23,83) 0.938 (28,99) 1.141 (24,43) (29,59) (19,32) (18,78) ** 20 28 52 44 68 84 0.020 (0,51) terminals 0.080 (2,03) 0.064 (1,63) (7,80) 0.307 (10,31) 0.406 (12,58) 0.495 (12,58) 0.495 (21,6) 0.850 (26,6) 1.047 0.045 (1,14) 0.045 (1,14) 0.035 (0,89) 0.035 (0,89) 0.010 (0,25) 12 13 14 15 16 18 17 11 10 8 9 7 5 4 3 2 0.020 (0,51) 0.010 (0,25) 6 1 28 26 27 19 21 b sq a sq 22 23 24 25 20 0.055 (1,40) 0.045 (1,14) 0.028 (0,71) 0.022 (0,54) 0.050 (1,27) notes: a. all linear dimensions are in inches (millimeters). b. this drawing is subject to change without notice. c. this package can be hermetically sealed with a metal lid. d. the terminals are gold plated. e. falls within jedec ms-004

important notice texas instruments incorporated and its subsidiaries (ti) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. all products are sold subject to ti?s terms and conditions of sale supplied at the time of order acknowledgment. ti warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with ti?s standard warranty. testing and other quality control techniques are used to the extent ti deems necessary to support this warranty. except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. ti assumes no liability for applications assistance or customer product design. customers are responsible for their products and applications using ti components. to minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. ti does not warrant or represent that any license, either express or implied, is granted under any ti patent right, copyright, mask work right, or other ti intellectual property right relating to any combination, machine, or process in which ti products or services are used. information published by ti regarding third-party products or services does not constitute a license from ti to use such products or services or a warranty or endorsement thereof. use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from ti under the patents or other intellectual property of ti. reproduction of information in ti data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. reproduction of this information with alteration is an unfair and deceptive business practice. ti is not responsible or liable for such altered documentation. resale of ti products or services with statements different from or beyond the parameters stated by ti for that product or service voids all express and any implied warranties for the associated ti product or service and is an unfair and deceptive business practice. ti is not responsible or liable for any such statements. following are urls where you can obtain information on other texas instruments products and application solutions: products applications amplifiers amplifier.ti.com audio www.ti.com/audio data converters dataconverter.ti.com automotive www.ti.com/automotive dsp dsp.ti.com broadband www.ti.com/broadband interface interface.ti.com digital control www.ti.com/digitalcontrol logic logic.ti.com military www.ti.com/military power mgmt power.ti.com optical networking www.ti.com/opticalnetwork microcontrollers microcontroller.ti.com security www.ti.com/security telephony www.ti.com/telephony video & imaging www.ti.com/video wireless www.ti.com/wireless mailing address: texas instruments post office box 655303 dallas, texas 75265 copyright ? 2005, texas instruments incorporated

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