Published by: Zaya

Published date: 26 Jun 2021

Logic gates are the basic building blocks of any digital system. It is an electronic circuit having one or more than one input and only one output. The relationship between the input and the output is based on a certain logic. Based on this, logic gates are named as AND gate, OR gate, NOT gate, etc.

**AND Gate**

A circuit that performs an AND operation is shown in the figure. It has n input (n >= 2) and one output.

**Logic diagram**

**Truth Table**

**OR Gate**

A circuit that performs an OR operation is shown in the figure. It has n input (n >= 2) and one output.

**Logic diagram**

**Truth Table**

**NOT Gate**

NOT gate is also known as Inverter. It has one input A and one output Y.

**Logic diagram**

**Truth Table**

**NAND Gate**

A NOT-AND operation is known as a NAND operation. It has n input (n >= 2) and one output.

**Logic diagram**

**Truth Table**

**NOR Gate**

A NOT-OR operation is known as a NOR operation. It has n input (n >= 2) and one output.

**Logic diagram**

**Truth Table**

**XOR Gate**

XOR or Ex-OR gate is a special type of gate. It can be used in the half adder, full adder, and subtractor. The exclusive-OR gate is abbreviated as the EX-OR gate or sometimes as the X-OR gate. It has n input (n >= 2) and one output.

**Logic diagram**

**Truth Table**

**XNOR Gate**

XNOR gate is a special type of gate. It can be used in the half adder, full adder, and subtractor. The exclusive-NOR gate is abbreviated as an EX-NOR gate or sometimes as an X-NOR gate. It has n input (n >= 2) and one output.

**Logic diagram**

**Truth Table**