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[[Image:2to4demux.svg|thumb|right|The four states of a 2-to-4 Decoder]]
In [[digital electronics]], an '''address decoder''' is a [[binary decoder]] circuit that has two or more bits of an [[address bus]] as inputs and that has one or more device selection lines as outputs.<ref name="TAoE">{{cite book|author=[[Paul Horowitz]] and [[Winfield Hill]]|title=[[The Art of Electronics]]| edition=2nd| year=1989| publisher=Cambridge University Press| isbn=978-0-521-37095-0| page=685,766}}</ref>
When the address for a particular device appears on the address bus, the address decoder asserts the selection line for that device. A separate single-device address decoder may be incorporated into each device on an address bus, or a single address decoder may serve multiple devices.<ref>{{cite book
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