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Logic Gates (AND, OR, NOT) — Digital Design Fundamentals — Vulkos | Vulkos

Digital Design Fundamentals·Signals, Bits & Logic

Logic Gates (AND, OR, NOT)

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Three shapes to know

The three core gate symbols drawn large and labelled: the flat-backed D-shaped AND gate, the curved shield-shaped OR gate

A logic gate takes one or more bits in and produces one bit out, following a fixed rule. Three gates are the foundation:

AND: output is 1 only when all inputs are 1.
OR: output is 1 when at least one input is 1.
NOT: output is the opposite of the input.

Underneath, each gate is a few transistors: real switches in silicon. AND is switches in series, OR is switches in parallel, NOT flips its input.