74AHCT138 3 TO 8 LINE DECODER DEMULTIPLEXER Description Pin Assignments The 74AHCT138 is an advanced high 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 E1 and E2, and one active HIGH enable input E3. The disabled device state results in all outputs being high. The enable state occurs with E1 and E2 asserted low and E3 asserted high. The multiple enable lines allow for the parallel expansion of decoders to create 4-to-16 line versions with 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 VCC = 4.5V CMOS Low Power Consumption Schmitt Trigger Action at All Inputs Memory chip select decoding Inputs Accept up to 6.0V Demultiplexing ESD Protection Tested per JESD 22 Single line peripheral control Exceeds 200-V Machine Model (A115-A) Exceeds 2000-V Human Body Model (A114-A) Exceeds 1000-V Charged Device Model (C101C) Applications 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) Notes: Allow simple serial bit streams from a microcontroller to control as many peripheral lines as needed 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" 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 1 of 9 www.diodes.com June 2013 © Diodes Incorporated 74AHCT138 Pin Descriptions Pin Number 1 2 3 4 Pin Name A0 A1 A2 E1 Enable Input 1 (active LOW) 5 E2 E3 Y7 GND Y6 Y5 Y4 Y3 Y2 Y1 Y0 Enable Input 2 (active LOW) Enable Input 3 (active HIGH) Output 7 (active LOW) Ground Output 6 (active LOW) Output 5 (active LOW) Output 4 (active LOW) Output 3 (active LOW) Output 2 (active LOW) Output 1 (active LOW) Output o (active LOW) VCC Supply Voltage 6 7 8 9 10 11 12 13 14 15 16 Description Address Input 0 Address Input 1 Address Input 2 Function Table Diagram Control E1 H X X L E2 X H X L Input Output E3 A2 A1 A0 X X L H X X L L L L H H H H L L H H L L H H 74AHCT138 Document number: DS35483 Rev. 2 - 2 X Y7 H Y6 H Y5 H Y4 H Y3 H Y2 H Y1 H Y0 H L H L H L H L H H H H H H H H L H H H H H H L H H H H H H L H H H H H H L H H H H H H L H H H H H H L H H H H H H L H H H H H H L H H H H H H H 2 of 9 www.diodes.com June 2013 © Diodes Incorporated 74AHCT138 Logic Diagram 74AHCT138 Document number: DS35483 Rev. 2 - 2 3 of 9 www.diodes.com June 2013 © Diodes Incorporated 74AHCT138 Absolute Maximum Ratings (Note 4) (@TA = +25°C, unless otherwise specified.) Symbol ESD HBM ESD CDM ESD MM Description Human Body Model ESD Protection Charged Device Model ESD Protection Machine Model ESD Protection Supply Voltage Range VCC VI Input Voltage Range Vo Voltage applied to output in high or low state IIK Input Clamp Current IOK Output Clamp Current IOK Output Clamp Current VO> VCC + 0.5V IO Continuous output current Rating 2 1 200 Unit KV KV V -0.5 to +7.0 V -0.5 to +7.0 V -0.3 to VCC +0.5 V VI< -0.5V -20 mA VO<-0.5V -20 mA 25 mA +/- 25 mA ICC Continuous current through VDD or GND 75 mA IGND Continuous current through VDD or GND -75 mA Operating Junction Temperature -40 to +150 °C TSTG Storage Temperature -65 to +150 °C PTOT Total Power Dissipation 500 mW TJ Notes: 4. Stresses beyond the absolute maximum may result in immediate failure or reduced reliability. These are stress values and device operation should be within recommend values. Recommended Operating Conditions (Note 5) (@TA = +25°C, unless otherwise specified.) Symbol VCC VI Parameter Conditions Supply Voltage Input Voltage Output Voltage Active Mode t/V Input transition Rise or Fall Rate VCC = 4.5V to 5.5V TA Operating Free-Air Temperature VO Note: Min Max Unit 4.5 5.5 V 0 5.5 V 0 VCC V 20 ns/V +125 °C -40 5. Unused inputs should be held at VCC or Ground. Electrical Characteristics (@TA = +25°C, unless otherwise specified.) Symbol Parameter Test Conditions VCC TA = +25°C Min Typ Max TA = -40°C to +85°C TA = -40°C to +125°C Min Max Min Max VIL High-level Input Voltage Low-level input voltage VOH High Level Output Voltage IOH = -50μA 4.5V 4.4 4.5 4.4 4.4 IOH = -8mA 4.5V 3.94 3.80 3.70 VOL Low-level Output IOL = 50μA Voltage IOL = 8mA 4.5V 0 0.1 0.1 0.1 4.5V 0.36 0.44 0.55 VIH II ICC ∆ICC Ci Unit 4.5V to 5.5V 2.0 2.0 2.0 V 4.5V to 5.5V 0.8 0.8 0.8 V V V Input Current VI = GND or 5.5V 0V to 5.5V 0.1 ±0.1 ±1 ±2 μA Supply Current VI = GND or VCC IO = 0 5.5V 4.0 40 80 μA 4.5V to 5.5V 1.35 1.5 1.5 mA 5.5V 4 10 10 10 pF Additional Supply Current per Input Input Capacitance VI = Vcc -2.1V IO = 0 Vi = VCC or GND 74AHCT138 Document number: DS35483 Rev. 2 - 2 4 of 9 www.diodes.com June 2013 © Diodes Incorporated 74AHCT138 Switching Characteristics Symbol tPD Parameter Test Conditions TA = +25°C Min Typ Max VCC -40°C to +85°C -40°C to +125°C Min Max Min Max Propagation Delay Figure 2 CL =15pF An to Yn Figure 2 CL = 50pF 4.5V to 5.5V 0.5 4.4 10.4 1.0 12.0 1.0 13.0 4.5V to 5.5V 0.5 6.2 11.4 1.0 13.0 1.0 14.5 Propagation Delay Figure 2 CL = 15pF E3 to Yn Figure 2 CL = 50pF 4.5V to 5.5V 0.5 4.3 9.1 1.0 10.5 1.0 11.5 4.5V to 5.5V 0.5 6.2 10.1 1.0 11.5 1.0 13.0 Propagation Delay Figure 2 CL = 15pF En to Yn Figure 2 CL = 50pF 4.5V to 5.5V 0.5 4.3 9.6 1.0 11.0 1.0 12.0 4.5V to 5.5V 0.5 6.2 10.6 1.0 12.0 1.0 13.5 Unit ns ns ns Operating Characteristics (@TA = +25°C, unless otherwise specified.) Test Conditions VCC = 5V Typ Unit f = 1 MHz all outputs switching-no load 23 pF Parameter Power dissipation capacitance Cpd Parameter Measurement Information VCC 4.5V to 5.5V Inputs VI 3.0 V VM tr/tf 3ns Input Output 1.5 V VCC/2 CL 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. tPLH and tPHL are the same as tPD. 74AHCT138 Document number: DS35483 Rev. 2 - 2 5 of 9 www.diodes.com June 2013 © Diodes Incorporated 74AHCT138 Figure 1. Load Circuit and Voltage Waveforms Ordering Information Part Number Package Code Packaging 74AHCT138S16-13 74AHCT138T16-13 S16 T16 SO-16 TSSOP-16 Notes: 7” Tape and Reel (Note 7) Quantity Part Number Suffix 2500/Tape & Reel -13 2500/Tape & Reel -13 7. The taping orientation is located on our website at http://www.diodes.com/datasheets/ap02007.pdf Marking Information (1) SO-16, TSSOP16 Part Number 74AHCT138S16 74AHCT138T16 74AHCT138 Document number: DS35483 Rev. 2 - 2 Package SO-16 TSSOP-16 6 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 H E Gauge Plane L Detail ‘A’ D A A2 e B A1 C 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 Θ 0 8 All Dimensions in mm Detail ‘A’ Package Type: TSSOP-16 E/2 SEE DETAIL 'A' E1 E Y X PIN 1 x) b e Ø0.760Depth0.050±0.02 A2 R1 D R L2 C GAUGE PLANE A L SEATING PLANE A1 L1 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 Θ 0° 8° Θ1 5° 15° Θ2 0° All Dimensions in mm DETAIL 'A' 74AHCT138 Document number: DS35483 Rev. 2 - 2 7 of 9 www.diodes.com June 2013 © Diodes Incorporated 74AHCT138 Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. Package Type: SO-16 X1 Y1 Y Pin 1 Dimensions C X X1 Y Y1 Value (in mm) 1.270 0.670 9.560 1.450 6.400 C X Package Type: TSSOP-16 X1 Dimensions C X X1 Y Y1 Y1 Y (16x) Value (in mm) 0.650 0.350 4.900 1.400 6.800 1 X (16x) 74AHCT138 Document number: DS35483 Rev. 2 - 2 C 8 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 reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. 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