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The Info List - NAND Gate


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In digital electronics , a NAND GATE (NEGATIVE-AND) is a logic gate which produces an output which 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 and junction diodes. By De Morgan\'s theorem , AB=A+B, and thus a N AND gate is equivalent to inverters followed by an OR gate .

The N AND gate is significant because any boolean function can be implemented by using a combination of NAND gates. This property is called functional completeness . It shares this property with the NOR gate .

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).

CONTENTS

* 1 Symbols * 2 Hardware description and pinout * 3 Implementations * 4 See also * 5 References * 6 External links

SYMBOLS

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

MIL/ ANSI
ANSI
Symbol IEC Symbol DIN
DIN
Symbol

HARDWARE DESCRIPTION AND PINOUT

NAND gates are basic logic gates, and as such they are recognised in TTL and CMOS
CMOS
ICs . This schematic diag