Logic Levels (high, low, 0, 1)

In digital circuits is common to say that we have a “high or a “low” logic level at the input or output of a circuit. If we have a “high” level we say it is a “1” and if we have a “low” level we say that it is a “0”.

The Gray code

The Gray code is a special type of binary code that is unweighted (the digits that make up the code does not have an assigned weight).

Aiken code – Excess 3 code

Aiken BCD code is similar to the natural BCD code, but with “weights” or “values” distributed differently.

The Excess 3 Code is obtained by adding “3” to each combination of the natural BCD code.

JK Flip-Flop – PRESET & CLEAR Inputs – Truth Table

The JK Flip-Flop is a sequential device with 3 inputs (J, K, CLK (clock signal)) and 2 outputs (Q and Q’). J and K are control inputs.

Sequential Circuits Using Logic Gates

The main difference between combinational circuits and sequential circuits is that in sequential circuits there is one or more output signals fed back to one or more inputs to obtain a new output.

Combinational Circuit Using Logic Gates

A combinational circuit is a circuit where the output depends only on the combination of the inputs at the time we are testing the output

Logic OR gate

The logic Or gate is one of the simplest digital logic gates. The output of this gate is “High”, when one or all of its inputs are “High”. We can also say that, the output of an OR gate is “Low” only when all gate inputs are “Low”.

What is a sequential circuit? This tutorial explains how a sequential circuit made with gates works. There are other circuits or ICs that already work sequential way, like a flip-flop. For example, JK flip-flop, T flip-flop, D flip-flop, SR flip-flop, etc. The main difference between combinational circuits and sequential circuits is that in sequential circuits there is one or more […]

What is a Logic AND gate?

The logic AND gate is one of the simplest gates in Digital Electronics. The output of an AND gate is true (“1”) only when all inputs are true (“1”). If one or more inputs are false (“0”), then the output is false (“0”). 

XOR logic gate

In digital electronics there are special gates. One of them is the XOR logic gate or exclusive OR gate. Equivalent XOR Logic Gate using common logic gates

BCD Code: Binary Coded Decimal

In order to share information in digital format, it is common to use a binary or hexadecimal representations (BCD Code). There are other methods to represent this information and one of them is the BCD code.

What is a Truth Table?

The Truth Table is used to simplify boolean equations obtained from digital circuits. The truth tables can have many columns, but all tables operate in the same way.