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== Implementations ==
The NAND gate has the property of [[functional completeness]]. That is, any other logic function (AND, OR, etc.) can be [[NAND logic|implemented]] using only NAND gates.<ref name="Mano">
Mano, M. Morris and Charles R. Kime. ''Logic and Computer Design Fundamentals, Third Edition.'' Prentice Hall, 2004. p. 73.</ref> An entire processor can be created using NAND gates alone. In TTL ICs using multiple-emitter [[transistors]], it also requires fewer transistors than a NOR gate. {|
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| [[Image:CMOS NAND Layout.svg|right|thumbnail|100px|The [[physical layout]] of a CMOS NAND]]
| [[Image:NXP-74AHC00D-HD.jpg|thumb|[[Die (integrated circuit)|Die]] of a 74AHC00D quad 2-input NAND gate manufactured by [[NXP Semiconductors]].]]
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=== Alternatives ===
If no specific NAND gates are available, one can be made from [[NOR Gate|NOR]] gates, because NAND and NOR gates are considered the "universal gates", meaning that they can be used to make all the others.<ref name="Mano"/>
{| align=center style="text-align:center"
!width="150" |NOR construction
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|[[File:NAND from NOR.svg]]
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