Question 1

What are the 7 basic logic gates?

Accepted Answer

The seven basic logic gates are AND, OR, NOT, NAND, NOR, XOR (exclusive OR) and XNOR (exclusive NOR). Every other digital logic circuit can be built from combinations of these gates.

Question 2

How does a truth table work?

Accepted Answer

A truth table lists every possible combination of input values (0 and 1) in the left columns and shows the resulting output of the gate in the rightmost column. For n inputs there are always 2 to the power of n rows.

Question 3

What is the difference between XOR and XNOR?

Accepted Answer

XOR outputs 1 when exactly one input is 1 (an odd number of 1s). XNOR is the inverse: it outputs 1 when both inputs are equal, so it is often called an equivalence gate.

Question 4

Can this tool handle more than 2 inputs?

Accepted Answer

Yes. Select 2, 3 or 4 inputs and the generator creates a complete truth table with 4, 8 or 16 rows respectively. Multi-input AND, OR, NAND, NOR, XOR and XNOR are all supported.