# Inverting gates

Martin McBride, 2017-01-04
Tags not gate nand gate nor gate truth table
Categories logic logic gates

There are two main types of inverting gates - NAND and NOR gates.

## NAND gates

A NAND gate (NOT AND) is similar to an AND gate, but it produces the opposite output - if both inputs are 1, the output is 0, otherwise the output is 1.

This is the symbol for a NAND gate: You can think of the gate as being equivalent to an AND gate followed by a NOT gate: ## NAND Truth table

Here is the truth table for a NAND gate: ## NAND interactive example

Here is an interactive NAND gate. Click on the inputs A and B to change their state, and see the output value Q.

## NOR gates

A NOR gate (NOT OR) is similar to an OR gate, but it produces the opposite output - if either (or both) inputs are 1, the output is 0, otherwise the output is 1.

This is the symbol for a NOR gate: You can think of the gate as being equivalent to an OR gate followed by a NOT gate: ## NOR Truth table

Here is the truth table for a NOR gate: # NOR interactive example

Here is an interactive NOR gate. Click on the inputs A and B to change their state, and see the output value Q.