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Logic Gates

Transcript: What are logic gates? An NAND gate will give a high output (1) in all scenarios unless both inputs are high . The Or Gate The And Gate There are seven basic logic gates: AND, OR, XOR, NOT, NAND, NOR, and XNOR. A logic gate is one of the main building blocks of a digital circuit. Majority of logic gates have only two inputs and one output. Electronic logic: digital and analogue signals Logic gates allow an electronic system to make a decision based on a number on its inputs. This means that each input and output of the gates must be one of two things, Either high, commonly referred to as on (1) and low which is commonly known as off (0) Logic Statements The Xor Gate is similar to an OR gate however with minor differences. The output of the Xor Gate is only high (1) if only one of the two inputs is high (1). If both inputs are the same ex. Low, Low (0,0) or High, High (1,1) then the output would be low (0) The NOR Gate The Not Gate What Are Truth Tables? A Nor gate will give a high output (1) if both inputs are low (0) . ex if there were 2 inputs that were low (0) then it would make the output high A logic gate truth table represents the possible input combinations of the logic gate/circuit which determines the output depending on the combination of the outputs and the gate that is being used. Each logic gate has its own unique truth table with different combinations which result in different outputs A not gate is different to the others. this is due to it only containing one input. It will give a high output if the input is low. The Xor Gate The Nand Gate The XOR (Exclusive Or) An Or gate will give a high output (1) if any of the inputs are high. ex if there was at least one input that was high (1) then it would make the output high as well This gate is similar to an OR gate but the output is only high if only one of the two inputs is high Logic Gates An AND gate will give a high output (1) only if all of the inputs are high. ex if there 2 inputs that were both 1, it would give an output of 1

Logic Gates

Transcript: XOR gate TTL - transistor-transistor logic - this technology supplanted DTL technology with observation that one transistor can replace two diodes with higher speed and using only half the space CMOS - complementary metal–oxide–semiconductor - to reduce size and power consumption the bipolar transistors have been replaced by complementary field-effect transistors (MOSFETs) AND gate Charles Sanders Peirce Technical classification: NOT gate Thank You for listening. described in a 1886 letter, how logical operations could be carried out by electrical switching circuits History introduced the use of Boolean algebra in the analysis and design of switching circuits in 1937 Nikola Tesla Types of logic gates Logic gates Types of logic gates A logic gate is an idealized or physical device implementing a Boolean function, that is, it performs a logical operation on one or more logic inputs and produces a single logic output. Harvard Mark I - electro-mechanical digital computer built from relays Technical classification: OR gate RTL - resistor-transistor logic - the simplest family of logic gates using bipolar transistors and resistors Implementation of logic gates Walther Bothe Maya II - a computer created from logic gates which has been made out of DNA, it can play a complete game of tic-tac-toe with human opponent Starting in 1898, Nikola Tesla filed for patents of devices containing electro-mechanical logic gate circuits Bartosz Radomski The first modern AND gate was made in 1924 by DTL - diode-transistor logic - resistors from RTL was replaced by diodes for higher speed Parts of presentation Claude Elwood Shannon Logic gates are primarily implemented using diodes or transistors acting as electronic switches, but can also be constructed using electromagnetic relays, fluidic logic, pneumatic logic, optics, molecules, or even mechanical elements. What is a logic gate Logic classification: Types of logic gates What is a logic gate History of logic gates Types of logic gates Implementation of logic gates

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