74LS260 Dual 5-Input NOR Gate


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.74LS260 Contain 5 inputs on each NOR Gate.

74LS260 Features

  • Two Independent Five Input NOR Gates
  • Low Power Requirements
  • Fast Switching Speeds
  • Operating Temperature to 70°C
  • Standard TTL Switching Voltages

74LS260 Specifications

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

74LS260 Pinout Diagram

74LS260 Pin Description

Pin NoPin NameDescription
1A1NOR Gate 1 Input 1
2B1NOR Gate 1 Input 2
3C1NOR Gate 1 Input 3
4A2NOR Gate 2 Input 1
5X1Output Of NOR Gate 1
6X2Output Of NOR Gate 2
8B2NOR Gate 2 Input 2
9C2NOR Gate 2 Input 3
10D2NOR Gate 2 Input 4
11E2NOR Gate 2 Input 5
12D1NOR Gate 1 Input 4
13E1NOR Gate 1 Input 5
14VCCPositive Supply


  • Construct the basic gates similar to AND gate

74LS260 Alternative Equivalent

74LS02, 74LS27

Download the 74LS260 Dual 5-Input NOR Gate Datasheet from the link given below.