74ahct138 document number: ds35483 rev. 2 - 2 1 of 9 www.diodes.com june 2013 ? diodes incorporated 74ahct138 3 to 8 line decoder demultiplexer description the 74ahct138 is an advanced hi gh speed cmos device that is designed to be pin compatable with 74ls low power schottky types. the device accepts a three bit binary weighted address on input pins a0, a1 and a2 and when enabled will produce one active low output with the remaining seven being high. there are two active low enable inputs e 1 and e 2, and one active high enable input e3. the disabled device state results in all outputs being high. the enable state occurs with e 1 and e 2 asserted low and e3 asserted high. the multiple enable lines allow for the parallel expansion of decoders to create 4-to-16 line versions wi th no additional parts and 5-to-32 versions with the addition of a single inverter. features ? supply voltage range from 4.5v to 5.5v ? sinks or sources 8ma at v cc = 4.5v ? cmos low power consumption ? schmitt trigger action at all inputs ? inputs accept up to 6.0v ? esd protection tested per jesd 22 ? exceeds 200-v machine model (a115-a) ? exceeds 2000-v human body model (a114-a) ? exceeds 1000-v charged device model (c101c) ? latch-up exceeds 250ma per jesd 78, class ii ? totally lead-free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. ?green? device (note 3) pin assignments applications ? memory chip select decoding ? demultiplexing ? single line peripheral control ? allow simple serial bit streams fr om a microcontroller to control as many peripheral lines as needed notes: 1. no purposely added lead. fully eu directiv e 2002/95/ec (rohs) & 2011/6 5/eu (rohs 2) compliant. 2. see http://www.diodes.com for more in formation about diodes incorpor ated?s definitions of halogen- and antimony-free, "gree n" and lead-free. 3. halogen- and antimony-free "green? products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total br + cl) and <1000ppm antimony compounds. click here for ordering information, located at the end of datasheet
74ahct138 document number: ds35483 rev. 2 - 2 2 of 9 www.diodes.com june 2013 ? diodes incorporated 74ahct138 pin descriptions pin number pin name description 1 a0 address input 0 2 a1 address input 1 3 a2 address input 2 4 e 1 enable input 1 (active low) 5 e 2 enable input 2 (active low) 6 e3 enable input 3 (active high) 7 y7 output 7 (active low) 8 gnd ground 9 y6 output 6 (active low) 10 y5 output 5 (active low) 11 y4 output 4 (active low) 12 y3 output 3 (active low) 13 y2 output 2 (active low) 14 y1 output 1 (active low) 15 y0 output o (active low) 16 v cc supply voltage function table diagram control input output e 1 e 2 e3 a2 a1 a0 y 7 y 6 y 5 y 4 y 3 y 2 y 1 y 0 h x x x x x h h h h h h h h x h x x x l l l h l l l h h h h h h h l l l h h h h h h h l h l h l h h h h h l h h l h h h h h h l h h h h l l h h h l h h h h h l h h h l h h h h h h h l h l h h h h h h h h h l h h h h h h h
74ahct138 document number: ds35483 rev. 2 - 2 3 of 9 www.diodes.com june 2013 ? diodes incorporated 74ahct138 logic diagram
74ahct138 document number: ds35483 rev. 2 - 2 4 of 9 www.diodes.com june 2013 ? diodes incorporated 74ahct138 absolute maximum ratings (note 4) (@t a = +25c, unless otherwise specified.) symbol description rating unit esd hbm human body model esd protection 2 kv esd cdm charged device model esd protection 1 kv esd mm machine model esd protection 200 v v cc supply voltage range -0.5 to +7.0 v v i input voltage range -0.5 to +7.0 v v o voltage applied to output in high or low state -0.3 to v cc +0.5 v i ik input clamp current v i < -0.5v -20 ma i ok output clamp current v o <-0.5v -20 ma i ok output clamp current v o > v cc + 0.5v 25 ma i o continuous output current +/- 25 ma i cc continuous current through v dd or gnd 75 ma i gnd continuous current through v dd or gnd -75 ma t j operating junction temperature -40 to +150 c t stg storage temperature -65 to +150 c p tot total power dissipation 500 mw notes: 4. stresses beyond the absolute maximum may result in immediate failure or reduced reliability. these are stress val ues and device operation should be within recommend values. recommended operating conditions (note 5) (@t a = +25c, unless otherwise specified.) symbol parameter conditions min max unit v cc supply voltage 4.5 5.5 v v i input voltage 0 5.5 v v o output voltage active mode 0 v cc v ? t/ ? v input transition rise or fall rate v cc = 4.5v to 5.5v 20 ns/v t a operating free-air temperature -40 +125 c note: 5. unused inputs should be held at v cc or ground. electrical characteristics (@t a = +25c, unless otherwise specified.) symbol parameter test conditions v cc t a = +25c t a = -40c to +85c t a = -40c to +125c unit min typ max min max min max v ih high-level input voltage 4.5v to 5.5v 2.0 ? ? 2.0 ? 2.0 ? v v il low-level input voltage 4.5v to 5.5v ? ? 0.8 ? 0.8 ? 0.8 v v oh high level output voltage i oh = -50 a 4.5v 4.4 4.5 ? 4.4 ? 4.4 ? v i oh = -8ma 4.5v 3.94 ? ? 3.80 ? 3.70 ? v ol low-level output voltage i ol = 50 a 4.5v ? 0 0.1 ? 0.1 ? 0.1 v i ol = 8ma 4.5v ? ? 0.36 ? 0.44 ? 0.55 i i input current v i = gnd or 5.5v 0v to 5.5v ? 0.1 0.1 ? 1 ? 2 a i cc supply current v i = gnd or v cc i o = 0 5.5v ? ? 4.0 ? 40 ? 80 a ? i cc additional supply current per input v i = vcc -2.1v i o = 0 4.5v to 5.5v ? ? 1.35 ? 1.5 ? 1.5 ma c i input capacitance v i = v cc or gnd 5.5v ? 4 10 ? 10 ? 10 pf
74ahct138 document number: ds35483 rev. 2 - 2 5 of 9 www.diodes.com june 2013 ? diodes incorporated 74ahct138 switching characteristics symbol parameter test conditions v cc t a = +25c -40c to +85c -40c to +125c unit min typ max min max min max t pd propagation delay an to y n figure 2 c l =15pf 4.5v to 5.5v 0.5 4.4 10.4 1.0 12.0 1.0 13.0 ns figure 2 c l = 50pf 4.5v to 5.5v 0.5 6.2 11.4 1.0 13.0 1.0 14.5 propagation delay e3 to y n figure 2 c l = 15pf 4.5v to 5.5v 0.5 4.3 9.1 1.0 10.5 1.0 11.5 ns figure 2 c l = 50pf 4.5v to 5.5v 0.5 6.2 10.1 1.0 11.5 1.0 13.0 propagation delay e n to y n figure 2 c l = 15pf 4.5v to 5.5v 0.5 4.3 9.6 1.0 11.0 1.0 12.0 ns figure 2 c l = 50pf 4.5v to 5.5v 0.5 6.2 10.6 1.0 12.0 1.0 13.5 operating characteristics (@t a = +25c, unless otherwise specified.) parameter test conditions v cc = 5v unit typ c pd power dissipation capacitance f = 1 mhz all outputs switching-no load 23 pf parameter measurement information v cc inputs v m c l v i t r /t f input output 4.5v to 5.5v 3.0 v 3ns 1.5 v v cc /2 15pf, 50pf voltage waveform pulse duration voltage waveform propagation delay times inverting and non inverting outputs notes: a. includes test lead and test apparatus capacitance. b. all pulses are supplied at pulse repetition rate 10 mhz. c. inputs are measured separately one transition per measurement. d. t plh and t phl are the same as t pd .
74ahct138 document number: ds35483 rev. 2 - 2 6 of 9 www.diodes.com june 2013 ? diodes incorporated 74ahct138 figure 1. load circuit and voltage waveforms ordering information part number package code packaging 7? tape and reel (note 7) quantity part number suffix 74AHCT138S16-13 s16 so-16 2500/tape & reel -13 74ahct138t16-13 t16 tssop-16 2500/tape & reel -13 notes: 7. the taping orientation is loca ted on our website at http:// www.diodes.com/dat asheets/ap02007.pdf marking information (1) so-16, tssop16 part number package 74ahct138s16 so-16 74ahct138t16 tssop-16
74ahct138 document number: ds35483 rev. 2 - 2 7 of 9 www.diodes.com june 2013 ? diodes incorporated 74ahct138 package outline dimensions (all dimensions in mm.) please see ap02002 at http://www.diodes.com/ datasheets/ap02002.pdf for latest version. package type: so-16 package type: tssop-16 so-16 dim min max a 1.40 1.75 a1 0.10 0.25 a2 1.30 1.50 b 0.33 0.51 c 0.19 0.25 d 9.80 10.00 e 3.80 4.00 e 1.27 typ h 5.80 6.20 l 0.38 1.27 ? 0 ? 8 ? ? all dimensions in mm tssop-16 dim min max typ a - 1.08 - a1 0.05 0.15 - a2 0.80 0.93 - b 0.19 0.30 - c 0.09 0.20 - d 4.90 5.10 - e 6.40 bsc e1 4.30 4.50 - e 0.65 bsc l 0.45 0.75 - l1 1.00 ref l2 0.25 bsc r 0.09 - - r1 0.09 - - x - - 1.350 y - - 1.050 0 8 - 1 5 15 - 2 0 - - all dimensions in mm d e h l a2 b e a1 a c detail ?a? detail ?a? gauge plane ? pin 1 e b e e/2 e1 a2 a d a1 x y see detail 'a' seating plane gauge plane r l l1 l2 ?0.760depth0.0500.02 r1 ? ? ? ? x) ?? ? c detail 'a'
74ahct138 document number: ds35483 rev. 2 - 2 8 of 9 www.diodes.com june 2013 ? diodes incorporated 74ahct138 suggested pad layout please see ap02001 at http://www.diodes.com/dat asheets/ap02001.pdf for the latest version. package type: so-16 package type: tssop-16 dimensions value (in mm) c 1.270 x 0.670 x1 9.560 y 1.450 y1 6.400 dimensions value (in mm) c 0.650 x 0.350 x1 4.900 y 1.400 y1 6.800 x1 x c y y1 pin 1 x1 y (16x) y1 x (16x) 1 c
74ahct138 document number: ds35483 rev. 2 - 2 9 of 9 www.diodes.com june 2013 ? diodes incorporated 74ahct138 important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liability ari sing out of the application or use of this document or any product described herein; neither does diodes inco rporated convey any license under its patent or trademark rights, nor the rights of others. any customer or us er of this document or products described herein in such applica tions shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose pr oducts are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability what soever in respect of any pr oducts purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or u nauthorized application, customers shall i ndemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, ex penses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. this document is written in english but may be translated into mu ltiple languages for reference. only the english version of t his document is the final and determinative format released by diodes incorporated. life support diodes incorporated products are specifically not authorized for use as critical comp onents in life support devices or systems without the express written approval of the chief executive offi cer of diodes incorporated. as used herein: a. life support devices or syst ems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when pro perly used in accordance with in structions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support devic e or system whose failure to perform can be reasonably expect ed to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifi cations of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for a ll legal, regulatory and safety-rel ated requirements concerning the ir products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or s ystems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporate d and its representatives against any damages arising out of the use of diodes incorporated products in such safety-critical, life suppor t devices or systems. copyright ? 2013, diodes incorporated www.diodes.com
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