23-06-2016, 10:55 AM
In digital electronics, a NAND gate (negative-AND) is a logic gate that produces an output that is false only when all its inputs are true. its output is therefore complementary to that of the door and. At low (0) output results only if both inputs to the gate are HIGH (1); If one or both inputs are LOW (0), HIGH (1) output results. It is made using transistors and junction diodes. By the theorem of De Morgan, AB = A + B, and thus a not gate is equivalent to ups followed by a door or.
The NAND gate is important, because any Boolean function can be implemented by using a combination of NAND gates. This property is called functional completeness.
Digital systems using some logic circuits benefit from functional completeness NAND.
The NAND function (a1, a2,..., an) is logically equivalent to NOT (a1 and a2 and...) AND (e)).
There are three symbols for NAND gates the symbol MIL / ANSI, IEC symbol, and the deprecated DIN symbol sometimes found on old patterns. For more information, see the symbols of logic gates. The ANSI symbol for the NAND gate is a gate standard with an inversion bubble connected.
