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- Logic gates
- Boolean Algebra Truth Table Tutorial – XOR, NOR, and Logic Symbols Explained
- Logic gates
- Boolean Algebra Truth Table Tutorial – XOR, NOR, and Logic Symbols Explained

A NOR gate is a logic gate which gives a positive output only when both inputs are negative. For example, the first embedded system , the Apollo Guidance Computer , was built exclusively from NOR gates, about 5, in total for the later versions. Today, integrated circuits are not constructed exclusively from a single type of gate. Instead, EDA tools are used to convert the description of a logical circuit to a netlist of complex gates standard cells or transistors full custom approach. This is made by joining the inputs of a NOR gate. An AND gate gives a 1 output when both inputs are 1.

The AND gate is a basic digital logic gate that implements logical conjunction - it behaves according to the truth table to the right. The function can be extended to any number of inputs. Additional inputs can be added as needed. For more information see Logic Gate Symbols. The digital inputs a and b cause the output F to have the same result as the AND function. AND gates are available in IC packages.

The AND gate is an electronic circuit which gives a high output only if all its inputs are high. The AND operation is represented by a dot. The OR gate is an electronic circuit which gives a high output if one or more of its inputs are high. The NOT gate is an electronic circuit which produces an inverted version of the input at its output. It is also known as an Inverter.

A high output 1 results if both of the inputs to the gate are the same. If one but not both inputs are high 1 , a low output 0 results. There are two symbols for XNOR gates : one with distinctive shape and one with rectangular shape and label. Both include four independent, two-input, XNOR gates. Datasheets are readily available in most datasheet databases and suppliers. If a specific type of gate is not available, a circuit that implements the same function can be constructed from other available gates. However, this approach requires five gates of three different kinds.

Logic gates are the basic building blocks of any digital system. It is an electronic circuit having one or more than one input and only one output. The relationship between the input and the output is based on a certain logic. A circuit which performs an AND operation is shown in figure. A circuit which performs an OR operation is shown in figure.

Truth Tables. Logic Gates. Multiple Input Gates. Gates and Functions Quiz. Boolean functions may be practically implemented by using electronic gates. The following points are important to understand. Truth tables are used to help show the function of a logic gate.

Logic gates process signals which represent true or false. Other terms used for the true and false states are shown in the table, it is best to be familiar with them all. Capital letters are normally used to make it clear that the term refers to a logic gate. The traditional symbols have distinctive shapes making them easy to recognise, they are widely used in industry and education.

*That is, given enough gates, either type of gate is able to mimic the operation of any other gate type. As proof of this property, this section will be divided into subsections showing how all the basic gate types may be formed using only NANDs or only NORs. Either method works, although connecting TTL inputs together increases the amount of current loading to the driving gate.*

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## 5 Comments

## Douglas M.

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## Izadine H.

We all love computers.

## Heidy N.

The truth table clearly shows that the NOR operation is the complement of the OR. Universal Gates: A universal gate is a gate which can implement any Boolean.

## Cacio S.

Logic gates and truth tables (con't). ◇ NAND. ◇ NOR. ◇ XOR. ◇ XNOR. X Y. •. XY. X Y. +. X Y Mapping Boolean expressions to logic gates. D. C. A. B. F.

## Laurence B.

The basic logic gates are the inverter (or NOT gate), the AND gate, the OR gate Shown here are example of truth tables for logic gate with 2, 3 and. 4 inputs.