74AHC138 3-TO-8 LINE DECODER DEMULTIPLEXER Description Pin Assignments 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. Preliminary 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 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 with no additional parts and 5-to-32 versions with the addition of a single inverter. Features Applications • Wide Supply Voltage Range from 2.0 V to 5.5 V • • Sinks or sources 8mA at Vcc = 4.5V • Demultiplexing • CMOS low power consumption • Single line peripheral control • Schmitt Trigger Action at All Inputs • Allow simple serial bit streams from a microcontroller to control • Inputs accept up to 5.5 V • ESD Protection Tested per JESD 22 Memory chip select decoding as many peripheral lines as needed. 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) Notes: 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 < 1000 ppm antimony compounds. Click for Ordering Information 74AHC138 Document number: DS35482 Rev. 2 - 2 1 of 10 www.diodes.com June 2013 © Diodes Incorporated 74AHC138 Pin Descriptions Pin Name 1 A0 Address Input 0 2 A1 Address Input 1 3 A2 Address Input 2 4 E1 Enable Input 1 (active LOW) 5 E2 Enable Input 2 (active LOW) 6 E3 Enable Input 3 (active HIGH) 7 Y7 Output 7 (active LOW) 8 GND 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 Vcc Supply Voltage Preliminary Pin Number Description Ground Function Table Diagram Control Input Output E1 E2 E3 A2 A1 A0 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 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 2 of 10 www.diodes.com June 2013 © Diodes Incorporated 74AHC138 Preliminary Logic Diagram 74AHC138 Document number: DS35482 Rev. 2 - 2 3 of 10 www.diodes.com June 2013 © Diodes Incorporated 74AHC138 Absolute Maximum Ratings (Note 4) (@TA = +25°C, unless otherwise specified.) Symbol ESD HBM ESD CDM ESD MM VCC Preliminary VI Rating Unit Human Body Model ESD Protection 2 KV Charged Device Model ESD Protection 1 KV Machine Model ESD Protection 200 V Supply Voltage Range -0.5 to 7.0 V Input Voltage Range -0.5 to 7.0 V Vo Voltage applied to output in high or low state -0.3 to VCC +0.5 V IIK Input Clamp Current VI < -0.5V -20 mA IOK Output Clamp Current VO < -0.5V -20 mA VO > VCC +0.5 V 20 mA +/- 25 mA IOK Output Clamp Current IO Continuous output current ICC Continuous current through VCC 75 mA IGND Continuous current through 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: Description 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) Symbol Parameter (@TA = +25°C, unless otherwise specified.) Conditions Min Max Unit 2.0 5.5 V Supply Voltage VI Input Voltage 0 5.5 V VO Output Voltage Active Mode 0 VCC V VCC = 3.0 V ± 0.3 V 100 VCC = 5.0 V ± 0.5 V 20 -40 +125 VCC t/V Input transition rise or fall rate TA Operating free-air temperature Notes: ns/V °C 5. Unused inputs should be held at VCC or Ground. 74AHC138 Document number: DS35482 Rev. 2 - 2 4 of 10 www.diodes.com June 2013 © Diodes Incorporated 74AHC138 Electrical Characteristics (@TA = +25°C, unless otherwise specified.) TA = +25°C Symbol VIH Preliminary VIL VOH VOL Parameter High-level Input Voltage Low-level input voltage High Level Output Voltage Test Conditions Vcc -40°C to +85°C -40°C to +125°C Min Typ Max Min Max Min Max Unit 2.0V 1.5 1.5 1.5 3.0V 2.1 2.1 2.1 5.5V 3.85 3.85 3.85 2.0V 0.5 0.5 0.5 3.0V 0.9 0.9 0.9 5.5V 1.65 1.65 1.65 IOH = -50 μA 2.0V 1.9 2.0 1.9 1.9 IOH = -50 μA 3.0V 2.9 3.0 2.9 2.9 IOH = -50 μA 4.5V 4.4 4.5 4.4 4.4 IOH = -4 mA 3.0V 2.58 2.48 2.40 IOH = -8 mA 4.5V 3.94 3.80 3.70 IOL = 50 μA 2.0V 0.1 0.1 0.1 IOL = 50 μA Low-level Output I = 50 μA OL Voltage IOL = 4 mA 3.0V 0.1 0.1 0.1 4.5V 0.1 0.1 0.1 3.0V 0.36 0.44 0.55 V V V V IOL = 8 mA 4.5V 0.36 0.44 0.55 Input Current VI =GND or 5.5 V 5.5V 0.1 ±1 ±2 μA ICC Supply Current VI = GND or VCC IO=0 A 5.5V 4.0 40 80 μA Ci Input Capacitance Vi = VCC or GND 5.5V 4.0 10 10 10 pF II Switching Characteristics Symbol Parameter Propagation Delay An to Yn tPD Propagation Delay E3 to Yn Propagation Delay En to Yn Test Conditions TA = +25°C Vcc -40°C to +85°C -40°C to +125°C Min Typ. Max Min Max Min Max Figure 2 3.0 V to 3.6V 0.5 4.4 8.0 0.5 9.5 0.5 11.5 CL=15 pF 4.5 V to 5.5 V 0.5 3.0 5.5 0.5 6.5 0.5 7.0 Figure 2 3.0 V to 3.6V 0.5 6.2 11.5 0.5 13.0 0.5 14.5 CL=50pF 4.5 V to 5.5 V 0.5 4.3 7.5 0.5 8.5 0.5 9.5 0.5 4.7 8.0 0.5 9.5 0.5 11.5 Figure 2 3.0 V to 3.6V CL=15 pF 4.5 V to 5.5 V 0.5 3.3 5.1 0.5 6.0 0.5 7.5 Figure 2 3.0 V to 3.6V 0.5 6.8 11.5 0.5 13.0 0.5 14.5 CL=50pF 4.5 V to 5.5 V 0.5 4.7 7.1 0.5 8.0 0.5 9.0 Figure 2 3.0 V to 3.6V 0.5 6.7 9.7 0.5 11.5 0.5 12.5 CL=15 pF 4.5 V to 5.5 V 0.5 4.8 6.8 0.5 8.0 0.5 8.5 Figure 2 3.0 V to 3.6V 0.5 9.6 13.2 0.5 15.0 0.5 16.5 CL=50pF 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 5 of 10 www.diodes.com Unit ns ns ns June 2013 © Diodes Incorporated 74AHC138 Operating Characteristics (@TA = +25°C, unless otherwise specified.) Parameter Cpd Test Conditions Power dissipation capacitance f = 1 MHz all outputs switching-no load VCC = 5 V Unit TYP 18 pF Preliminary Parameter Measurement Information Vcc Inputs VM CL 6ns VCC/2 50pF 6ns VCC/2 15pF used for 5V typical test VI tr/tf 2.0V -6.0V VCC 5.0V VCC 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 Figure 1. Load Circuit and Voltage Waveforms 74AHC138 Document number: DS35482 Rev. 2 - 2 6 of 10 www.diodes.com June 2013 © Diodes Incorporated 74AHC138 Preliminary Ordering Information Device Package Code 7” Tape and Reel (Note 7 Packaging (Note 6) 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. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/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 74AHC138 Document number: DS35482 Rev. 2 - 2 Part Number Package 74AHC138S16 74AHC138T16 SO-16 TSSOP-16 7 of 10 www.diodes.com June 2013 © Diodes Incorporated 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 SOIC-16 D Dim E/2 E1/2 E Preliminary E1 b 16X e A1 A SEATING PLANE 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 - Ø 0° 8° - Ø1 5° 15° - All Dimensions in mm DETAIL 'A' 8X Ø1 TSSOP-16 GAUGE PLANE SEATING PLANE L Ø (2) Package Type: TSSOP-16 Dim Min Max 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 E1 6.40 BSC 4.30 e L E/2 SEE DETAIL 'A' 0.45 Y X PIN 1 x) b e A2 0.75 - 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 Ø0.760Depth0.050±0.02 - 1.00 REF L2 E1 4.50 0.65 BSC L1 E Typ R1 D R C L2 GAUGE PLANE A L SEATING PLANE A1 74AHC138 Document number: DS35482 Rev. 2 - 2 L1 8 of 10 www.diodes.com June 2013 © Diodes Incorporated 74AHC138 Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (1) Package Type: SO-16 X1 Preliminary Dimensions C X X1 Y Y1 Y1 Value (in mm) 1.270 0.670 9.560 1.450 6.400 Y Pin 1 C X (2) Package Type: TSSOP-16 X1 Y1 Y (16x) Dimensions Value (in mm) C 0.650 X 0.350 X1 4.900 Y 1.400 Y1 6.800 1 X (16x) 74AHC138 Document number: DS35482 Rev. 2 - 2 C 9 of 10 www.diodes.com June 2013 © Diodes Incorporated 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). Preliminary 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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