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Home » Other
Introduction to Logic Gates
Author: Gabriel Torres
Type: Tutorials Last Updated: October 21, 2005
Page: 8 of 10
Real-time pricing for Routledge 0-415-22675-9.
Introduction to Logic 9780415226752 Harry Gensler Books 0-415-22675-9 Routledge Introduction to Logic
Amazon: $41.46 Buy.com: $68.60

XNOR

XNOR stands for exclusive NOR and is an XOR gate with its output inverted. So, its output is at “1” when the inputs have the same value and “0” when they are different. XNOR operation is represented by the symbol (·). So Y = A (·) B. You can see XNOR logic gate symbol on Figure 20 and its truth table right below it.

XNOR gate
Figure 20: XNOR logic gate.

A

B

Y

0

0

1

0

1

0

1

0

0

1

1

1

So its output will only be at “1” when all its inputs have the same value. Otherwise its output will be “0”.

If you need more than two inputs, you will need to add an AND gate like shown on Figure 21. Another way is to use the circuit shown on Figure 18 adding an inverter on its output.

XNOR gate
Figure 21: Expanding XNOR inputs.

As an example of integrated circuit with XNOR gates we have 747266 and you can check its pinout on Figure 22.

747266 IC
click to enlarge
Figure 22: 747266 integrated circuit provides four two-inputs XNOR gates.

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