74LS147 10 to 4 Priority Encoder


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. The 74LS147 priority decoding of the inputs ensures that only the highest-order data line is encoded. Both devices have data inputs and outputs which are active at the low logic level.

74LS147 Features

74LS147 Specifications

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

74LS147 Pinout Diagram

74LS147 Pin Description

Pin NoPin NameDescription
14Input Pin 1
25Input Pin 2
36Input Pin 3
47Input Pin 4
58Input Pin 5
6COutput Pin 3
7BOutput Pin 2
8GNDGround Pin
9AOutput Pin 1
109Input Pin 6
111Input Pin 7
122Input Pin 8
133Input Pin 9
14DOutput Pin 4
15NCNot Connected
16VCCPositive Supply

74LS147 Circuit


  • Keyboard Encoding
  • Range Selection
  • Signal Transmission

74LS147 Alternative Equivalent


Download 74LS147 10 to 4 Priority Encoder Datasheet from the link given below.