Diodes Menu Close

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

Back to Logic Master Table

74AHC138

3-to-8 Line Decoder Demultiplexer

Contact Sales

Log in or register to manage email notifications about changes to datasheets or PCNs for this part.

Description

The 74AHC138 is 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 enab°C will porduce one active low output with the remaing seven being high. There are two active LOW enable inputs 1 and 2, and one active HIGH enable input E3. The disab°C device state results in all outputs being high. The enable state occurs with 1 and 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.

Application(s)

  • 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.
  • Product Specifications

    Product Parameters

    Number of Gates -
    Family AHC
    VCC Min (V) 2 V
    VCC Maximum Rating 5.5 V
    tpd max @ (1.5V) - ns
    tpd max @ 1.8V (ns) - ns
    tpd max @ 2.5V (ns) - ns
    tpd max @ 3.3V (ns) 9.5 ns
    tpd max @ 5.0V (ns) - ns
    Input/ Output Current 8
    Description 3-to-8 Line Decoder Demultiplexer
    Output Type Push-Pull

    Related Content

    Packages

    Technical Documents

    Recommended Soldering Techniques

    TN1.pdf

    Orderable Part Number Buy from Distributor / Contact Sales Request Samples
    74AHC138S16-13

    74AHC138S16-13

    Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
    Mouser Electronics Inc. 1815 10/4/2022 South America, North America, Asia, Europe, Middle East Buy Now
    RS Components - Spain 450 10/4/2022 Spain Contact Sales
    RS Components - UK 450 10/4/2022 England Buy Now
    Digi-Key Electronics 2014 10/3/2022 Europe, Asia, North America Buy Now
    Request Sample
    74AHC138T16-13

    74AHC138T16-13

    Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
    Mouser Electronics Inc. 78 10/4/2022 South America, North America, Asia, Europe, Middle East Buy Now
    Request Sample

    Product Change Notices (PCNs)

    A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

    PCN # Issue Date Implementation Date Subject
    PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site