74ahc138 document number: ds35482 rev. 2 - 2 1 of 10 www.diodes.com june 2013 ? diodes incorporated preliminary 74ahc138 3-to-8 line decoder demultiplexer description the 74ahc138 is an advanced high speed cmos device. 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 versi ons with no additional parts and 5-to-32 versions with the addition of a single inverter. features ? wide supply voltage range from 2.0 v to 5.5 v ? sinks or sources 8ma at vcc = 4.5v ? cmos low power consumption ? schmitt trigger action at all inputs ? inputs accept up to 5.5 v ? 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 ? so16 available in ?green? molding compound (no br, sb) ? lead-free finish; rohs compliant (notes 1 & 2) pin assignments applications ? memory chip select decoding ? demultiplexing ? single line peripheral control ? allow simple serial bit streams from 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 br omine, <900ppm chlorine (<1500ppm t otal br + cl) and < 1000 ppm antimony compounds. click for ordering information
74ahc138 document number: ds35482 rev. 2 - 2 2 of 10 www.diodes.com june 2013 ? diodes incorporated preliminary 74ahc138 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
74ahc138 document number: ds35482 rev. 2 - 2 3 of 10 www.diodes.com june 2013 ? diodes incorporated preliminary 74ahc138 logic diagram
74ahc138 document number: ds35482 rev. 2 - 2 4 of 10 www.diodes.com june 2013 ? diodes incorporated preliminary 74ahc138 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 +0.5 v 20 ma i o continuous output current +/- 25 ma i cc continuous current through v cc 75 ma i gnd continuous current through 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 valu es 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 ? 2.0 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 = 3.0 v 0.3 v ? 100 ns/v v cc = 5.0 v 0.5 v ? 20 t a operating free-air temperature ? -40 +125 c notes: 5. unused inputs should be held at v cc or ground.
74ahc138 document number: ds35482 rev. 2 - 2 5 of 10 www.diodes.com june 2013 ? diodes incorporated preliminary 74ahc138 electrical characteristics (@t a = +25c, unless otherwise specified.) symbol parameter test conditions vcc t a = +25c -40c to +85c -40c to +125c unit min typ max min max min max v ih high-level input voltage ? 2.0v 1.5 ? ? 1.5 ? 1.5 ? v ? 3.0v 2.1 ? ? 2.1 ? 2.1 ? ? 5.5v 3.85 ? ? 3.85 ? 3.85 ? v il low-level input voltage ? 2.0v ? ? 0.5 ? 0.5 ? 0.5 v ? 3.0v ? ? 0.9 ? 0.9 ? 0.9 ? 5.5v ? ? 1.65 ? 1.65 ? 1.65 v oh high level output voltage i oh = -50 a 2.0v 1.9 2.0 ? 1.9 ? 1.9 ? v i oh = -50 a 3.0v 2.9 3.0 ? 2.9 ? 2.9 ? i oh = -50 a 4.5v 4.4 4.5 ? 4.4 ? 4.4 ? i oh = -4 ma 3.0v 2.58 ? ? 2.48 ? 2.40 ? i oh = -8 ma 4.5v 3.94 ? ? 3.80 ? 3.70 ? v ol low-level output voltage i ol = 50 a 2.0v ? ? 0.1 ? 0.1 ? 0.1 v i ol = 50 a 3.0v ? ? 0.1 ? 0.1 ? 0.1 i ol = 50 a 4.5v ? ? 0.1 ? 0.1 ? 0.1 i ol = 4 ma 3.0v ? ? 0.36 ? 0.44 ? 0.55 i ol = 8 ma 4.5v ? ? 0.36 ? 0.44 ? 0.55 i i input current v i =gnd or 5.5 v 5.5v ? ? 0.1 ? 1 ? 2 a i cc supply current v i = gnd or v cc i o =0 a 5.5v ? ? 4.0 ? 40 ? 80 a c i input capacitance v i = v cc or gnd 5.5v ? 4.0 10 ? 10 ? 10 pf switching characteristics symbol parameter test conditions vcc 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 =15 pf 3.0 v to 3.6v 0.5 4.4 8.0 0.5 9.5 0.5 11.5 ns 4.5 v to 5.5 v 0.5 3.0 5.5 0.5 6.5 0.5 7.0 figure 2 c l =50pf 3.0 v to 3.6v 0.5 6.2 11.5 0.5 13.0 0.5 14.5 4.5 v to 5.5 v 0.5 4.3 7.5 0.5 8.5 0.5 9.5 propagation delay e3 to y n figure 2 c l =15 pf 3.0 v to 3.6v 0.5 4.7 8.0 0.5 9.5 0.5 11.5 ns 4.5 v to 5.5 v 0.5 3.3 5.1 0.5 6.0 0.5 7.5 figure 2 c l =50pf 3.0 v to 3.6v 0.5 6.8 11.5 0.5 13.0 0.5 14.5 4.5 v to 5.5 v 0.5 4.7 7.1 0.5 8.0 0.5 9.0 propagation delay e n to y n figure 2 c l =15 pf 3.0 v to 3.6v 0.5 6.7 9.7 0.5 11.5 0.5 12.5 ns 4.5 v to 5.5 v 0.5 4.8 6.8 0.5 8.0 0.5 8.5 figure 2 c l =50pf 3.0 v to 3.6v 0.5 9.6 13.2 0.5 15.0 0.5 16.5 4.5 v to 5.5 v 0.5 6.8 8.8 0.5 10.0 0.5 11.0
74ahc138 document number: ds35482 rev. 2 - 2 6 of 10 www.diodes.com june 2013 ? diodes incorporated preliminary 74ahc138 operating characteristics (@t a = +25c, unless otherwise specified.) parameter test conditions v cc = 5 v unit typ c pd power dissipation capacitance f = 1 mhz all outputs switching-no load 18 pf parameter measurement information vcc inputs v m c l v i t r /t f 2.0v -6.0v v cc 6ns v cc /2 50pf 5.0v v cc 6ns v cc /2 15pf used for 5v typical test 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 separat ely one transition per measurement d. t plh and t phl are the same as t pd figure 1. load circuit and voltage waveforms
74ahc138 document number: ds35482 rev. 2 - 2 7 of 10 www.diodes.com june 2013 ? diodes incorporated preliminary 74ahc138 ordering information device package code packaging (note 6) 7? tape and reel (note 7 quantity part number suffix 74ahc138s16-13 s16 so-16 2500/tape & reel -13 74AHC138T16-13 t16 tssop-16 2500/tape & reel -13 notes: 6. pad layout as shown on diodes inc. s uggested pad layout document ap02001, wh ich can be found on our website at http://www.diodes.c om/datasheets/ap02001.pdf 7. the taping orientation is located on our website at http://www.diodes.com /datasheets/ap02007.pdf marking information (1) so-16, tssop-16 part number package 74ahc138s16 so-16 74ahc138t16 tssop-16
74ahc138 document number: ds35482 rev. 2 - 2 8 of 10 www.diodes.com june 2013 ? diodes incorporated preliminary 74ahc138 package outline dimensions (all dimensions in mm) please see ap02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version. (1) package type: so-16 (2) package type: tssop-16 soic-16 dim min max typ a - 1.75 - a1 0.10 0.25 - b 0.31 0.51 - c 0.10 0.25 - d 9.80 10.00 - e 5.80 6.20 - e1 3.80 4.00 - e - - 1.27 l 0.40 1.27 - ? 0 8 - ?1 5 15 - 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 detail 'a' seating plane gauge plane ? l 8x ?1 e b 16x e e/2 e1 e1/2 d seating plane a a1 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
74ahc138 document number: ds35482 rev. 2 - 2 9 of 10 www.diodes.com june 2013 ? diodes incorporated preliminary 74ahc138 suggested pad layout please see ap02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (1) package type: so-16 (2) 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 (16 x) 1 c
74ahc138 document number: ds35482 rev. 2 - 2 10 of 10 www.diodes.com june 2013 ? diodes incorporated preliminary 74ahc138 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 reserve the right to ma ke modifications, enhancements, improvements, corrections or ot her changes without further notice to this document and any product descri bed herein. diodes incorporated does not assume any liability ari sing out of the application or use of this document or any product described her ein; neither does diodes incorp orated 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 products 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 products purchased through unauthoriz ed sales channel. should customers purchase or use diodes in corporated products for any unintended or unauthorized application, customers shall i ndemnify and hold diodes incorporated and its represent atives harmless against all claims, dam ages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated 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 components in life support devices or systems without the express written approval of the chief executive officer 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 proper ly used in accordance with instructions 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 devi ce 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 ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible fo r all legal, regulatory and safety-related requirements concerning their products and any use of diodes incorporated products in such safety-criti cal, life support devices or systems, notwithstanding any devic es- or systems- related information or support that may be provided by diodes inco rporated. further, customers must fully indemnify diodes inc orporated and its representatives against any damages aris ing out of the use of diodes incorporated products in such safety-critical, life su pport devices or systems. copyright ? 2013, diodes incorporated www.diodes.com
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