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SN54HC138

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3-Line To 8-Line Decoders/Demultiplexers

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Data sheet

SN54HC138

ACTIVE
Data sheet Order now

Product details

Technology family HC Number of channels 1 Operating temperature range (°C) -55 to 125 Rating Military Supply current (max) (µA) 160
Technology family HC Number of channels 1 Operating temperature range (°C) -55 to 125 Rating Military Supply current (max) (µA) 160
CDIP (J) 16 135.3552 mm² 19.56 x 6.92 CFP (W) 16 69.319 mm² 10.3 x 6.73 LCCC (FK) 20 79.0321 mm² 8.89 x 8.89
  • Targeted Specifically for High-Speed Memory Decoders and Data-Transmission Systems
  • Wide Operating Voltage Range (2 V to 6 V)
  • Outputs Can Drive Up To 10 LSTTL Loads
  • Low Power Consumption, 80-µA Maximum ICC
  • Typical tpd = 15 ns
  • ±4-mA Output Drive at 5 V
  • Low Input Current of 1-µA Maximum
  • Active Low Outputs ( Selected Output is Low)
  • Incorporate Three Enable Inputs to Simplify Cascading or Data Reception
  • Targeted Specifically for High-Speed Memory Decoders and Data-Transmission Systems
  • Wide Operating Voltage Range (2 V to 6 V)
  • Outputs Can Drive Up To 10 LSTTL Loads
  • Low Power Consumption, 80-µA Maximum ICC
  • Typical tpd = 15 ns
  • ±4-mA Output Drive at 5 V
  • Low Input Current of 1-µA Maximum
  • Active Low Outputs ( Selected Output is Low)
  • Incorporate Three Enable Inputs to Simplify Cascading or Data Reception

The SNx4HC138 devices are designed to be used in high-performance memory-decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, these decoders can be used to minimize the effects of system decoding. When employed with high-speed memories using a fast enable circuit, the delay times of these decoders and the enable time of the memory are usually less than the typical access time of the memory. This means that the effective system delay introduced by the decoders is negligible.

The SNx4HC138 devices are designed to be used in high-performance memory-decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, these decoders can be used to minimize the effects of system decoding. When employed with high-speed memories using a fast enable circuit, the delay times of these decoders and the enable time of the memory are usually less than the typical access time of the memory. This means that the effective system delay introduced by the decoders is negligible.
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Technical documentation

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Type Title Date
* Data sheet SNx4HC138 3-Line To 8-Line Decoders/Demultiplexers datasheet (Rev. G) PDF | HTML 08 Oct 2021
* SMD SN54HC138 SMD 84062012A 21 Jun 2016
Application note Implications of Slow or Floating CMOS Inputs (Rev. E) 26 Jul 2021
Selection guide Logic Guide (Rev. AB) 12 Jun 2017
Application note Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) 02 Dec 2015
User guide LOGIC Pocket Data Book (Rev. B) 16 Jan 2007
Application note Semiconductor Packing Material Electrostatic Discharge (ESD) Protection 08 Jul 2004
User guide Signal Switch Data Book (Rev. A) 14 Nov 2003
Application note TI IBIS File Creation, Validation, and Distribution Processes 29 Aug 2002
Application note CMOS Power Consumption and CPD Calculation (Rev. B) 01 Jun 1997
Application note Designing With Logic (Rev. C) 01 Jun 1997
Application note Input and Output Characteristics of Digital Integrated Circuits 01 Oct 1996
Application note Live Insertion 01 Oct 1996
Application note SN54/74HCT CMOS Logic Family Applications and Restrictions 01 May 1996
Application note Using High Speed CMOS and Advanced CMOS in Systems With Multiple Vcc 01 Apr 1996

Design & development

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Package Pins CAD symbols, footprints & 3D models
CDIP (J) 16 Ultra Librarian
CFP (W) 16 Ultra Librarian
LCCC (FK) 20 Ultra Librarian
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