74LS93 4-bit Binary 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. 74LS93 monolithic counters contain four master-slave flip-flops and additional gating to provide a divide-by-two counter and a three-stage binary counter for which the count cycle length is divide-by-eight for the LS93.

74LS93 Features

  • Contains a divide-by-two Section and a divide-by-eight Section
  • Sections Can be Combined to form BCD, modulo-12 or modulo-16 Counters
  • Low Power Dissipation
  • Operating Temperature up to 70°C
  • Standard TTL Switching Voltages

74LS93 Specifications

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

74LS93 Pinout Diagram

74LS93 Pin Description

Pin NoPin NameDescription
1CP1′Clock (Active LOW going edge) Input 1
2MR1Master Reset (Clear) Input 1
3MR2Master Reset (Clear) Input 2
4NCNot Connected
5VCCPositive Supply
6NCNot Connected
7NCNot Connected
8Q2Output Bit 2 Of Counter
9Q1Output Bit 1 Of Counter
10GNDGround Pin
11Q3Output Bit 3 Of Counter
12Q0Output Bit 0 Of Counter
13NCNot Connected
14CP0′Clock (Active LOW going edge) Input 0


  • Frequency counters
  • Digital clocks
  • Analog to digital converters
  • In time measurement

74LS93 Alternative Equivalent

74LS92, 74LS161, 74LS162

Download the 74LS93 4-bit Binary Counter Datasheet from the link given below.