OR-AND-invert


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:

2-2 OAI gate

A 2-2-OAI gate realizes the following function:

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.