XOR gate
| INPUT | OUTPUT | |
| A | B | A XOR B |
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
The XOR gate (Exclusive OR) is a logic gate that outputs 1 (true) when exactly one of its inputs is 1 (true). That means that if both of its inputs are the same, the output will be 0 (false). The XOR gate does what is called an exclusive disjunction in logic.
Symbols
There are three symbols for the XOR gate:
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| MIL/ANSI Symbol | IEC Symbol | DIN Symbol |
XOR Gate Media
ANSI Symbol for an XOR Gate
Implementation of XOR gate using two pass gates. When B is high the inverted value of A passes through to the output and when B is low then A passes through to the output instead. The circuit uses 12 MOSFETs the 8 in the diagram plus another four to invert A and B
A picture of transmission gate logic implementation of an XOR gate
A three-gate representation of a XOR gate, with the logic (A NAND B) AND (A OR B).
A labelled MIL/ANSI symbol for an XOR gate. A and B are the inputs, Q is the output
A way of building an XOR gate from only NAND gates. This construction has a propagation delay 3 times that of a single gate and uses 4 gates.
A way of building an XOR gate from only NOR gates. This construction has a propagation delay 4 times that of a single gate and uses 5 gates- an alternative design has just 3, and uses the same number of gates.
