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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]] that has two or more inputs for [[address bus|address]] bits and one or more outputs for device selection signals.<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=[https://archive.org/details/artofelectronics00horo/page/685 685,766]}}</ref> When the address for a particular device appears on the address inputs, the decoder asserts the selection output for that device. A dedicated, single-output address decoder may be incorporated into each device on an address bus, or a single address decoder may serve multiple devices.<ref>{{cite book
|author=S. J. Cahill
|title=Digital and microprocessor engineering
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