Category: 7. Logic Gates

There are three basic types of digital logic gates, the AND Gate, the OR Gate and the NOT Gate. We have also seen that digital logic gates have an opposite or complementary form of itself in the form of the NAND Gate, the NOR Gate and the Buffer respectively, and that any of these individual…

Digital Buffers and Tri-state Buffers can provide current amplification in a digital circuit to drive output loads. The digital buffer is the logic gate opposite of an inverter (Not Gate) we look at in the previous tutorial where we saw that the NOT gates output state is the complement, opposite or inverse of its input…

The Exclusive-NOR Gate function is a digital logic gate that is the reverse or complementary form of the Exclusive-OR function. Basically the “Exclusive-NOR Gate” is a combination of the Exclusive-OR gate and the NOT gate but has a truth table similar to the standard NOR gate in that it has an output that is normally…

The Exclusive-OR logic function is a very useful circuit that can be used in many different types of computational circuits. The “Exclusive OR Gate” is another type of digital logic gate commonly used in arithmetic operations since it can be used to give the sum of two binary numbers as well as error-detection and correction…

The Logic NOR Gate gate is a combination of the digital logic OR gate and an inverter or NOT gate connected together in series. The inclusive NOR (Not-OR) gate has an output that is normally at logic level “1” and only goes “LOW” to logic level “0” when ANY of its inputs are at logic level “1”.…

The Logic NAND Gate is a combination of a digital logic AND gate and a NOT gate connected together in series. The NAND (Not – AND) gate has an output that is normally at logic level “1” and only goes “LOW” to logic level “0” when ALL of its inputs are at logic level “1”. The Logic NAND Gate is the reverse or…

The Logic NOT Gate is the most basic of all the logical gates and is often referred to as an Inverting Buffer or simply an Inverter. Inverting NOT gates are single input devices which have an output level that is normally at logic level “1” and goes “LOW” to a logic level “0” when its…

The Logic OR Gate is a type of digital logic circuit whose output goes HIGH to a logic level 1 only when one or more of its inputs are HIGH. The output, Q of a “Logic OR Gate” only returns “LOW” again when ALL of its inputs are at a logic level “0”. In other words for…

The Logic AND Gate is a type of digital logic circuit whose output goes HIGH to a logic level 1 only when all of its inputs are HIGH. The output state of a digital logic AND gate only returns “LOW” again when ANY of its inputs are at a logic level “0”. In other words for a…

A Digital Logic Gate is an electronic circuit which makes logical decisions based on the combination of digital signals present on its inputs. A digital logic gate can have more than one input, for example, inputs A, B, C, D etc., but generally only have one digital output, (Q). Individual logic gates can be connected or cascaded…