Logic gates

Computers rely on binary representation, using only two values

• 0 &

  1

• on & off

• octal representation
• hexadecimal representation

takes a single input, either a zero or a one,  and inverts it so that the output is the opposite of whatever the input is

• AND

• NOT

• OR

• NAND

fundamental digital logic gate will output one when both inputs are one, but in all other cases, will output a zero

• OR

• AND

• NOT

• NOR

fundamental digital logic gate takes two inputs and produces output of one if at least one of the inputs is one

• AND

• OR

• NOT

• NOR

fundamental digital logic gate that outputs 0 only when both inputs are 1. In all other cases, it outputs 1

• AND

• NAND

• OR

• XOR

fundamental digital logic gate that outputs 1 only when both inputs are 0. In all other cases, it outputs 0

• AND

• XOR

• XNOR

• NOR

fundamental digital logic gate that its output is one only when one of the two inputs is one , but not both. If both inputs have the same value whether both are zero or both are one the output will be zero.

• NAND
• XOR
• AND
• OR

fundamental digital logic gate will output a one when the two inputs are the same, both zeros or both ones.

• AND

• NAND

• XOR

• XNOR