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.

Video

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Logic gates

1. Logic gates
2. - AND gates
3. - Truth tables
4. - OR gates
5. - NOT gates
6. - XOR gates
7. - Inverting gates
8. - Combining gates
9. Resources

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