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Startseite > Other > The Ultimate Guide to 74LS32 Quad-2-Input OR Gate: Datasheet & Uses

The Ultimate Guide to 74LS32 Quad-2-Input OR Gate: Datasheet & Uses

Updatezeit: 2023-11-29 14:05:23


In digital electronics, logic gates serve as fundamental building blocks. Each logic gate is designed to execute a specific Boolean function, while a combination of these gates forms a network capable of implementing complex Boolean expressions. The basic digital logic gates trio consists of AND, OR, and NOT. More advanced logic gates such as NAND, XOR, NOR, and XNOR are created by interconnecting these gates. Among these, the OR gate, a digital logic gate, takes center stage for arithmetic and logical operations, finding application wherever mathematical computations are essential. 

An OR gate comprises one or more inputs, generating a single output. The OR gate outputs a true signal (1) when at least one input is true (1). Simply put, as long as any input is not 0, the OR gate produces an output of 1. The OR gate operates in contrast to an AND gate, which determines the minimum value of binary inputs, while the OR gate identifies the maximum value among the binary inputs. This article provides an overview of the 74LS32 OR gate, also called the 74LS32 quad-2-input OR gate, including datasheet, pinout, features, uses, and more details.

What is 74LS32?

The 74LS32 is a dual input OR gate housed in a quad package. It encompasses four independent gates, each executing the logical OR function. Termed as a Quad 2-Input OR Gate, each gate boasts two inputs. This IC belongs to the 74XXYY IC series. With a broad working voltage range and compatibility with CMOS, NMOS, and TTL, the 74LS32 interacts directly with various systems. Its output consistently adheres to TTL standards, facilitating seamless integration with other TTL devices and microcontrollers. The 74LS32 IC, characterized by its compact size and enhanced speed, establishes reliability across diverse devices. Logic gates like the 74LS32 and flip-flops assume a pivotal role in digital electronics.


74LS32 Pinout

74LS32 Pinout.png

Pin Configuration

Pin No.Pin NamePin Description
11AINPUT 1 of GATE 1
21BINPUT 2 of GATE 1
42AINPUT 1 of GATE 2
52BINPUT 2 of GATE 2
7GNDGround Pin
103AINPUT 1 of GATE 3
124BINPUT 2 of GATE 4
134AINPUT 1 of GATE 4
14VccSupply Voltage

74LS32 Quad-2-Input OR Gate Pin Description

Pin No.Pin NamePin Description
1,4,9,12OR Gate Input pin (A)First Input pin for the OR gate
2,5,10,13OR Gate Input pin (B)Second Input pin for the OR gate
3,6,8,11OR Gate Output pin (Q)Output pin for the OR gate
7GroundConnect to the ground of the circuit.
14Vcc (Vdd)Used to power the IC. Typically +5V is used

74LS32 Features

  • Dual Input OR Gate – Quad Package

  • Technology Family: LS

  • Supply Voltage: 5 to 7V

  • Input Voltage: 5 to 7V

  • VCC (Min): 4.75V

  • VCC (Max): 5.25V

  • Number of Channels: 4

  • Inputs per Channel: 2

  • IOL (Max): 0.8mA

  • IOH (Max): -16mA

  • Input Type: TTL-Compatible CMOS

  • Output Type: Push-Pull

  • Features: High Speed (TPD 10-50ns)

  • Data Rate (Max): 28Mbps

  • Rating: Catalog

  • Operating Temperature Range: 0°C to 70°C (SN7432, SN74LS32, and SN74S32)

  • Operating Temperature Range: -55°C to 125°C (SN5432, SN54LS32, and SN54S32)

  • Available in a 14-pin SOIC package

How Does 74LS32 Work?


74ls32 truth table

Following the truth table, the OR gate output is designated as LOW only when both input signals are LOW. Conversely, the output is set to HIGH if either or both inputs are HIGH. In practical terms, the OR gate output is HIGH whenever one or both inputs are in a HIGH state.

In our OR gate circuit, we incorporate a 1K resistor to ground both gate inputs. These inputs are linked to the power source via buttons. Pressing a button causes the corresponding gate input to go HIGH. Thus, the truth table for the OR gate can be replicated with just two button presses. If one button is pressed, one input is HIGH and the other is LOW, resulting in a HIGH output. When both buttons are pressed, both inputs are HIGH, yielding a HIGH output.

When both buttons are released, both OR gate inputs are LOW, and the output is LOW. Therefore, according to the truth table, the LED should be off only when both buttons are released. If one or both buttons are pressed, the LED should illuminate.

74LS32 Circuit.jpg

Since the chosen Integrated Circuit is positive edge-triggered, the pull-down resistors are crucial to prevent unexpected consequences if neglected. The capacitors in the circuit counteract button bouncing effects, enhancing the smooth operation of the gate, although not strictly necessary.

How to use 74LS32

Like other chips within the 7400 series, this IC requires a power connection before utilization. Most 7400 ICs operate with a VCC voltage of 5V, and the 74LS32 specifically supports a 5V supply. After establishing the power connection, you gain access to the four fundamental OR gates within.

The 74LS32 or 74LS32N features 12 input/output pins, providing four OR gates. To activate the 74LS32 Logic gate IC, simply supply power through the VCC and ground pins. The standard operating voltage is +5V, with the flexibility to function at +7V. The output voltage on pin Y corresponds to the IC's operating voltage. Under the OR gate truth table, a high output is achieved when either one or both inputs are high.


74ls32 pin diagram.png

Following the truth table, a low output is observed when both inputs are low, and a high output results when either one or both inputs are high.

74LS32 Circuit Example

Here's a straightforward project utilizing the OR gates within the 74LS32 IC.


The pull-down resistors ensure that both inputs to the OR gate are LOW when the buttons are not pressed. Pressing any of the buttons will set the input pin to HIGH. A HIGH signal on any of the inputs activates the output, subsequently turning on the Light-Emitting Diode (LED).

Therefore, pushing any of the buttons will illuminate the LED.

To assemble this circuit, you'll require the following components:

  • 1 x 74LS32

  • 1 x LED (L1)

  • 2 x 10 kΩ resistor (R1-R2)

  • 1 x 1 kΩ resistor (R3)

  • 2 x pushbutton (S1-S2)

Advantages of 74LS32

The advantages of the 74LS32 quad-2-Input OR gate encompass the following:

  • The 74LS32 IC can directly interface with CMOS, NMOS, and TTL.

  • These OR gates exhibit versatility and find application in a wide range of digital circuits.

  • They are reliable and can withstand harsh environmental conditions.

  • These logic gates are cost-effective.

  • They are user-friendly and easy to implement.

  • Various implementations are possible with these logic gates.

  • This IC is available in compact sizes.

  • It boasts a high-speed operation.

74LS32 Equivalents

Here are equivalents for 74LS32: 74HC32, 74HCT32, 74LVC32, 74AC32, 74ALS32, 74F32, 74C32 .

Other Logic Gates:  74LS00, 74LS08, 74LS02, 74LS04, 74HCT04.

74LS32 Applications

  • Basic Logic Circuits

  • Encoders and Decoders

  • Multiplexers and De-multiplexers

  • Oscillator circuits

  • Networking and Digital Systems 

  • Data Validation Circuits

  • Sequential Circuits

  • Digital Logic & TTL Logic Circuits

  • Memory Circuits

  • Process Control Systems

  • Digital Signal Processing

  • Computer Networking

  • Industry Stepper Motors

  • Automatic Digital Control Circuits

  • Doorbell Switches

  • Notebooks & PCs

74LS32 2D-Model & Dimension




74LS32 Dimension 01.jpg

74LS32 Dimension.jpg

74LS32 Dimension 03.jpg

74LS32 Dimension 04.jpg

74LS32 Datasheet

Download 74LS32 Datasheet PDF.


In conclusion, the 74LS32 Quad-2-Input OR Gate is a stalwart in electronic components. Armed with a comprehensive understanding of its datasheet and applications, engineers and hobbyists can harness its power for innovative and reliable electronic designs.

Read More

Vorherige: 4-Bit Binary Counter: Working, Circuit Diagram & Applications

Nächste: The Ultimate Guide to Implementing NOR Gate from NAND Gate


  • What is the function of 74LS32?
  • The 74LS32 finds application in constructing fundamental logic gate circuits and encoders, decoders, multiplexers, demultiplexers, and oscillator circuits, etc. This Dual Input OR Gate with a Quad package encompasses four independent gates, each executing the logic OR function.

  • How many pins are there on a regular 74LS32 IC?
  • The 74LS32 is a 14-pin IC with four independent 2-input OR gates featuring standard push-pull outputs. This device is crafted for operation within a power supply range of 2.0V to 6.0V.

  • What type of gate is 74LS32?
  • Dual Input OR Gate.

  • How many gates are there in a 74LS32 IC?
  • Four separate.

  • What does Quad 2-input mean?
  • Quad 2-input NAND: The term "quad" denotes four, and a "2-input NAND" is a digital logic gate executing the NAND operation on two input signals. Therefore, a quad 2-input NAND comprises four NAND gates, each having two inputs, within a single integrated circuit (IC).

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