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Encyclopedia > Three state logic

In electronics a three-state or 3-state digital logic gate is one in which the output circuit can be completely switched off, putting the output in a high-impedance state. The output asserts neither a logic 1 nor logic 0 voltage level and aside from stray capacitance and leakage currents puts no load on the circuits connected to the output. A common synonym is tristate logic, which is a registered trademark of National Semiconductor. Such output circuits are commonly used when many devices must share a common bus, such as for memory or input/output circuit boards. Two digital voltmeters The field of electronics is the study and use of systems that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. ... A logic gate is an arrangement of controlled switches used to calculate operations using Boolean logic in digital circuits. ... Categories: Electronics companies of the United States | Companies based in California | Corporation stubs ... In computer architecture, a bus is a subsystem that transfers data or power between computer components inside a computer or between computers. ...

3-state outputs are implemented in various families of digital integrated circuits such as the Texas Instruments 7400 series of TTL gates, and often in the data and address bus lines of microprocessors. Optical Microscope image of an integrated circuit showing defects in the aluminium layer deposition. ... Texas Instruments (NYSE: TXN), better known in the electronics industry as TI, is a company based in Dallas, Texas, renowned for developing and commercializing semiconductor and computer technology. ... The 7400 series of TTL integrated circuit SSI devices were historically important as the first widespread family of IC devices. ... A Motorola 68000-based computer with various TTL chips. ... Microprocessors, including an Intel 80486DX2 and an Intel 80386 A microprocessor (sometimes abbreviated µP or uP) is a digital electronic component with miniaturized transistors on a single semiconductor integrated circuit (IC). ...

This form of gate should not be confused with 3-value logic (ternary logic). Ternary logic is a multi-valued logic in which there are three truth values indicating true, false and unknown. ...



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