74LS132 Quad 2-input NAND Schmitt Trigger


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. 74LS132 circuit functions as a 2-input NAND gate, but because of the Schmitt action, it has different input threshold levels for positive (VT+) and for negative-going (VT- signals).

74LS132 Features

  • Four Independent NAND Gates
  • Each Input has Hysteresis for Noise Immunity
  • Jitter Free Output
  • Operating Temperature up to 70°C
  • Standard TTL Switching Voltages

74LS132 Specifications

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

74LS132 Pinout Diagram

74LS132 Pin Description

Pin NoPin NameDescription
11AInput 1 Of Schmitt Trigger 1
21BInput 2 Of Schmitt Trigger 1
31YOutput Of Schmitt Trigger 1
42AInput 1 Of Schmitt Trigger 2
52BInput 2 Of Schmitt Trigger 2
62YOutput Of Schmitt Trigger 2
83YOutput Of Schmitt Trigger 3
93AInput 1 Of Schmitt Trigger 3
103BInput 2 Of Schmitt Trigger 3
114YOutput Of Schmitt Trigger 4
124AInput 1 Of Schmitt Trigger 4
134BInput 2 Of Schmitt Trigger 4
14VCCPositive Supply

74LS132 Circuit


  • Schmitt triggers are mainly used for changing a sine wave to a square wave.
  • They must be utilized in the switch de-bouncer circuit for noisy otherwise slow input requirements like to be cleaned up or speed up

74LS132 Alternative Equivalent

74LS14, 74LS13

Download 74LS132 Quad 2-input NAND Schmitt Trigger Datasheet from the link given below.