Binary numbers and Voltage Levels
Binary digits are 0 and 1. In digital logic these two digits are use to represent two voltage levels.
Signals in digital electronics have two distinct voltage levels with built-in tolerances for variations in the voltage
A valid digital signal should be within either of the two shaded areas
AND gate
Boolean Expression
X = A . B
Logic Diagram Symbol
Truth Table
OR gate
Boolean Expression
X = A + B
Logic Diagram Symbol
Truth Table
Tri-state buffer
Inverter
Boolean Expression
X = A'
Logic Diagram Symbol
Truth Table
XOR gate
Boolean Expression
Logic Diagram Symbol
Truth Table
NAND Gate
Boolean Expression
X = (A . B)'
Logic Diagram Symbol
Truth Table
NOR gate
Boolean Expression
X = (A + B)'
Logic Diagram Symbol
Truth Table
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