74LS162 BCD Decade 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. The 74162A is a high-speed 4-bit synchronous counter. 74LS162 is edge-triggered, synchronously presettable, and cascadable MSI building blocks for counting, memory addressing frequency division, and other applications

74LS162 Features

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

74LS162 Specifications

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

74LS162 Pinout Diagram

74LS162 Pin Description

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


  • Clock generation
  • Clock division
  • Integrated oscillator
  • Low power CMOS
  • TTL compatible inputs
  • In frequency counting circuits

74LS162 Alternative Equivalent


Download 74LS162 BCD Decade Counter Datasheet from the link given below.