74HC138 Datasheet – 3-to-8 Line Decoder/Demultiplexer

Part Number : 74HC138

Description : 3-to-8 line decoder/demultiplexer inverting

Package : DIP, SMD 16 Pin

Manufactures : Philips



The 74HC138 / 74HCT138 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC138 / 74HCT138 decoders accept three binary weighted address inputs (A0, A1, A2) and when enabled, provide 8 mutually exclusive active LOW outputs (Y0 to Y7).




1. Demultiplexing capability
2. Multiple input enable for easy expansion
3. Ideal for memory chip select decoding
4. Active LOW mutually exclusive outputs
5. Output capability: standard
6. ICC category: MSI

Functional Diagram74hc138-datasheet-pinout


Reference site

  1. https://learn.adafruit.com/delorean-time-circuit/circuit-trickery

74HC138 Datasheet


HC4053 Datasheet – Multiplexers/Demultiplexers – Hitachi

Part Number : HC4053, HD74HC4053

Description : Triple 2-channel Analog Multiplexers/Demultiplexers

Manufactures : Hitachi Semiconductor

Pinouts :
HC4053 pinout

HD74HC4053: This device contains 6 switches whose outputs are connected together in pairs, thus
implementing a triple 2 channel multiplexer, or the equivalent of 3 single-pole-double throw configuration.
Each of the A, B, or C select lines independently controls one pair of switches, selecting one of the two
switches to be “on”.


•  High Speed Operation
•  Wide Operating Voltage
•  Low Quiescent Supply Current

Block Diagram

HC4053 block diagram

HC4053 Datasheet