XNOR gate

INPUT		OUTPUT
A	B	A XNOR B
0	0	1
0	1	0
1	0	0
1	1	1

The XNOR gate is a logic gate that outputs 1 (true) when both of its inputs are equal. If only one output is high(1) the output is low (0). It is opposite of XOR GATE.

Symbols

There are three symbols for the XNOR gate:

	File:XNOR IEC.svg
MIL/ANSI Symbol	IEC Symbol	DIN Symbol

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XNOR Gate Media

Pinout diagram of the 74HC266N, 74LS266 and CD4077 quad XNOR plastic dual in-line package 14-pin package (PDIP-14) ICs.
XNOR gate circuit using three mixed gates
A labelled MIL/ANSI symbol for an XNOR gate. A and B are the inputs, Q is the output
A way of building an XNOR gate from only NAND 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.
A way of building an XOR gate from only NOR gates. This construction has a propagation delay 3 times that of a single NOR gate and uses 4 gates.
A labelled MIL/ANSI symbol for an XNOR gate. A and B are the inputs, Q is the output
XNOR from NAND 2.svg

A way of building an XNOR gate from only NAND gates, using the expression A⋅
XNOR from NOR 2.svg

A way of making an XNOR gate from only NOR gates, using the expression (A