NAND Gate Simulation Tutorials in Proteus Software

NAND Gate Tutorials-

In digital electronics, a NAND gate (negative-AND) is a logic gate which produces an output that is false only if all its inputs are true; thus its output is complement to that of the AND gate.

A LOW (0) output results only if both the inputs to the gate are HIGH (1); if one or both inputs are LOW (0), a HIGH (1) output results. It is made using transistors. By De Morgan's theorem, AB=A+B, a NAND gate is equivalent to inverters followed by an OR gate.

NAND Gate Simulation in Proteus Software.



The NAND gate is significant because any boolean function can be implemented by using a combination of NAND gates. This property is called functional completeness.

Digital systems employing certain logic circuits take advantage of NAND's functional completeness.


The function NAND(a1, a2, ..., an) is logically equivalent to NOT(a1 AND a2 AND ... AND an).

Symbols of NAND Gate


There are three symbols for NAND gates: the MIL/ANSI symbol, the IEC symbol and the deprecated DIN symbol sometimes found on old schematics. For more information see logic gate symbols. The ANSI symbol for the NAND gate is a standard AND gate with an inversion bubble connected.

Alternatives for NAND Gate
If no specific NAND gates are available, one can be made from NOR gates, because NAND and NOR gates are considered the "universal gates", meaning that they can be used to make all the others.

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