74LS163 Fully Synchronous 4-bit Counter


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.74LS163 Fully Synchronous 4-bit Counter. 74LS163 is edge-triggered, synchronously presettable, and cascadable MSI building blocks for counting, memory addressing frequency division, and other applications

74LS163 Features

  • Edge Triggered High-Speed 4-bit Synchronous (Binary) Counters
  • Synchronous Master Reset
  • Count Rate of 35MHz
  • Operating Temperature up to 70°C
  • Standard TTL Switching Voltages

74LS163 Specifications

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

74LS163 Pinout Diagram

74LS163 Pin Description

Pin NoPin NameDescription
1CLR’Clear Pin
2CLKClock Pin
3AData Input Pin
4BData Input Pin
5CData Input Pin
6DData Input Pin
7ENPEnable Pin
9LOAD’Load Pin
10ENTEnable Pin T
11QDOutput Pin
12QCOutput Pin
13QBOutput Pin
14QAOutput Pin
15RCORipple Carry Output
16VCCPositive Supply


  • Frequency counters
  • Digital clocks
  • Analog to digital converters
  • With some changes in their design, counters can be used as frequency divider circuits
  • In time measurement

74LS163 Alternative Equivalent


Download 74LS163 Fully Synchronous 4-bit Counter Datasheet from the link given below.