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Reference.org
AND-OR-invert
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<p>AND-OR-invert (AOI) logic and AOI gates are two-level compound (or complex) logic functions constructed from the combination of one or more <a href="/facts/AND_gate/tVKQD0w1">AND gates</a> followed by a <a href="/facts/NOR_gate/3l3MqaMI">NOR gate</a> (equivalent to an <a href="/facts/OR_gate/ox2lHgIM">OR gate</a> through an <a href="/facts/Inverter_gate/pGk3qGTI">Inverter gate</a>, which is the "OI" part of "AOI"). Construction of AOI cells is particularly efficient using <a href="/facts/CMOS/NJIWYgBl">CMOS</a> technology, where the total number of transistor gates can be compared to the same construction using <a href="/facts/NAND_logic/ye1XC5Ac">NAND logic</a> or <a href="/facts/NOR_logic/GhHdKb4q">NOR logic</a>. The complement of AOI logic is <a href="/facts/OR-AND-invert/StxwfXPG">OR-AND-invert</a> (OAI) logic, where the OR gates precede a NAND gate. </p>