74LS156 Dual 2 To 4 Line Demultiplexer (Open Collector)


The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. 74LS156 transistor-transistor-logic (TTL) circuits feature dual 1-line-to-4-line demultiplexers with individual strobes and common binary-address inputs in a single 16-pin package

74LS156 Features

  • Contains Two Demultiplexers To Convert Serial Data to Parallel Output
  • Open Collector Outputs for Driving Large Loads
  • Low Power
  • Operating Temperature up to 70°C
  • Standard TTL Switching Voltages

74LS156 Specifications

Supply Voltage4.75 – 5.25Vdc
Maximum Clock Frequency40Mhz
Power Dissipation2mW/gate @100kHz
Minimum Output Current8mA
Propagation Delay10nS
Fan Out (TTL Loads)20

74LS156 Pinout Diagram

74LS156 Pin Description

Pin NoPin NameDescription
1ICData Input 1C
21G’Strobe Pin 1G’
3BSelect Input B
41Y3Output 1Y3
51Y2Output 1Y2
61Y1Output 1Y1
71Y0Output 1Y0
8GNDGround Pin
92Y0Output 2Y0
102Y1Output 2Y1
112Y2Output 2Y2
122Y3Output 2Y3
13ASelect Input A
142G’Strobe Pin 2G’
152C’Data Input 2C
16VCCPositive Supply

74LS156 Circuit


  • Connect a single source to multiple destinations. 

74LS156 Alternative Equivalent


Download 74LS156 Dual 2/4 Demultiplexer (Open Collector) Datasheet from the link given below.