The NOR gate (NOT-OR gate) is a frequently used logic gate in digital logic circuits and performs the “NOT OR” operation. Its operation can be explained by inverting the output of the OR gate, turning 1 into 0 and 0 into 1.
The NOR gate produces a 0 when at least one of its inputs is 1, and it produces a 1 when all inputs are 0. In other words, the output is 1 only when all inputs are 0.
The truth table for this gate is as follows:
| Input A | Input B | Output |
|---|---|---|
| 0 | 0 | 1 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 0 |
6.1. Features
- Inverting Property
The NOR gate operates by inverting the output of an OR gate, allowing it to be used as the complement of the OR gate. - Universal Gate
The NOR gate can be used to implement all other logic gates (AND, OR, NOT, NAND, etc.). This property, shared with the NAND gate, allows it to be considered a universal gate. Logical functions of other gates can be created using only a NOR gate. - Multi-Input Structure
NOR gates can operate with two or more inputs, providing flexibility in the design of more complex circuits.
6.2. Why is it Important?
he NOR gate’s property as a universal gate makes it extremely important in logic circuit design. Using this gate, all other logic functions can theoretically be created, which provides design flexibility. Additionally, by using NOR gates, the cost of circuits can be reduced, and simpler circuits can be designed with fewer types of components.
NOT!
A universal gate is a type of logic gate used in circuit design that can perform the functions of all other logic gates (AND, OR, NOT, etc.). In other words, any logic circuit can be created using only these gates. Universal gates provide flexibility and simplicity in circuit design because different logical functions can be implemented using just one type of gate.
There are two main types of universal gates: NAND and NOR gates.