OR-AND-invert gates, or OAI-gates, are logic gates comprising OR gates followed by a NAND gate. They can be efficiently implemented in logic families like CMOS and TTL. They are dual to AND-OR-invert gates. Overview OR-AND-invert gates implement the inverted product of sums. groups of , input signals combined with OR, and the results then combined with NAND. Examples 2-1 OAI-gate
A 2-1-OAI gate realizes the following function:
Truth table 2-1 OAIInputA B C Output Y 2-2 OAI gate A 2-2-OAI gate realizes the following function:
Truth table 2-2 OAIINPUTA B C D OUTPUT Q
Realization
OAI-gates can efficiently be implemented as complex gates. An example of a 3-1 OAI-gate is shown in the figure below.
Examples of use One possibility of implementing an XOR gate is by using a 2-2-OAI-gate with non-inverted and inverted inputs.
References