74LS155 Dual 2-Bit Binary Decoder/Demultiplexer IC

74LS155 Dual 2-Bit Binary Decoder/Demultiplexer IC

74LS155 is a member of the 74XXYY family of TTL logic gates. The design is intended for the chip to be used in high-performance memory-decoding or data-routing applications, requiring very short propagation delay times. The output of the IC always comes in TTL which makes it easy to work with other TTL devices and microcontrollers. The IC 74LS155 is smaller in size and it has a much faster speed which makes it reliable in every kind of device.

What is a Demultiplexer/Decoder?

A demultiplexer is a combinational logic circuit designed to switch one common input line to one of several separate output line. So, A demultiplexer converts a serial data signal at the input to a parallel data at its output lines.

74LS155 Pinout

74ls155 pinout

74LS155 Pin Configuration

Pin NoPin NameDescription
1Ea’Active Low Enable Pin Ea’
2Ea’Active Low Enable Pin Ea’
3A1Address Input Pin
4O3a’Active Low Output Pin
5O2a’Active Low Output Pin
6O1a’Active Low Output Pin
7O0a’Active Low Output Pin
8GNDGround Pin
9O0b’Active Low Output Pin
10O1b’Active Low Output Pin
11O2b’Active Low Output Pin
12O3b’Active Low Output Pin
13A0Address Input Pin
14Eb’Active Low Enable Pin Eb’
15Eb’Active Low Enable Pin Eb’
16VccChip Supply Voltage

74LS155 Features & Specifications

  • Technology Family: LS
  • Rating: Catalog
  • VCC (min): 4.75V
  • VCC (max): 5.25V
  • Supply voltage: 1.0V to 5.5V
  • Frequency at nominal voltage: 35 MHz
  • Typical propagation delay: 21nS
  • Low power consumption: 32mW
  • Operating temperature: -40ºC to +125ºC
  • ESD protection
  • IOL (Max): 8mA
  • IOH (Max): 8mA
  • Balanced propagation delays
  • Designed specifically for high speed
  • Channels (#): 2
  • Configuration: 2:4
  • Product type: Standard


  • Demultiplexers receive output signals of the multiplexers and convert them back to the original form of the data at the receiving end in communication systems.
  • Serves the function of Speed synchronization of multiple motors in industries.
  • Also used in War field flying robot with a night vision flying camera.


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  • Views: 2772
  • Product Code: 74LS155
  • Availability: In Stock
  • KES 150.00

Tags: 74LS155, Dual 2-Bit Binary Decoder/Demultiplexer, 74155, 74HC155

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