Logic gates and timing diagrams (Introduction to the operational environment)

Logic gate

A digital circuit that performs a logical operation on one or more binary inputs and produces a single binary output. They form the building blocks of digital systems

Truth tables

Used to represent the outputs of logic gates for all possible combinations of inputs

Timing diagram

graph of the output of a logic gate with respect to inputs of the gate

The 7 basic logic gates

-AND

-OR

-NOT

-XOR

-NAND

-NOR

-XNOR

AND

True only if both A and B are true

OR

True if atleast one input is true

NOT

Inverts input

XOR

True if only one of the inputs is true

NAND

Opposite of AND: False only if both inputs are true (think of it as NOT AND)

NOR

Opposite of OR: True only if both inputs are false (think of it as NOT OR)

XNOR

Opposite of XOR: True if inputs are the same (not whether its true or false, but if the inputs are the same)

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