Transistor-transistor logic

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	Transistor-transistor logic - Wikipedia, the free encyclopedia
		Transistor-Transistor Logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT), and resistors.
		TTL became popular with electronic systems designers in 1962 after Texas Instruments introduced the 7400 series of ICs, which had a wide range of digital logic block functions.
		Before the advent of VLSI devices, TTL integrated circuits were a standard method of construction for the processors of mini-computer and mainframe processors; such as the Digital Equipment Corporation VAX and Data General Eclipse, and for equipment such as machine tool numerical controls, printers, and video display terminals.
	en.wikipedia.org /wiki/Transistor-transistor_logic (954 words)

	Logic gate - Encyclopedia, History, Geography and Biography
		Logic circuits are often classified in two groups: combinatorial logic, in which the outputs are continuous-time functions of the inputs, and sequential logic, in which the outputs depend on information stored by the circuit as well as on the inputs.
		Logic gates are primarily electronically-controlled but can also be constructed from electromagnetic relays, electronic diodes, fluidics, optical or even mechanical elements.
		The field-programmable nature of programmable logic devices such as FPGAs has removed the 'hard' property of hardware; it is now possible to change the logic design of a hardware system by reprogramming some of its components, thus allowing the features or function of a hardware implementation of a logic system to be changed.
	www.arikah.com /encyclopedia/Logic_gate (1789 words)

	Digital Logic Gates Part-V
		In RTL (resistor transistor logic), all the logic are implemented using resistors and transistors.
		In DTL (Diode transistor logic), all the logic are implemented using diodes, and transistors.
		Q3 is called pull-up transistor, as it pulls the output voltage up, when it saturates and other is in cut-off (i.e.
	www.asic-world.com /digital/gates5.html (748 words)

	Logic_gate
		Logic circuits are often classified in two groups: combinatorial logic, in which the outputs are continuous-time functions of the inputs, and sequential logic, in which the outputs depend on information stored by the circuit as well as on the inputs.
		Logic gates are primarily electronically-controlled but can also be constructed from electromagnetic relays, electronic diodes, fluidics, optical or even mechanical elements.
		The field-programmable nature of programmable logic devices such as FPGAs has removed the 'hard' property of hardware; it is now possible to change the logic design of a hardware system by reprogramming some of its components, thus allowing the features or function of a hardware implementation of a logic system to be changed.
	www.apawn.com /search.php?title=Logic_gate (1729 words)

	Bipolar Transistor Logic
		At the input to D3, a logic 0 is represented by approximately 0.7 V, while a logic 1 is in the range 4 to 5 V. D3 increases the voltage required to turn on the transistor.
		Diodes, transistors, and resistors can be used to implemented a wide variety of gates.
		The pull-up path, namely the R3 resistor, Q4 transistor, and the diode of the output stage of Figure B.11, is eliminated in an open-collector gate.
	www2.ele.ufes.br /~ailson/digital2/cld/AppendixB/appendixB.doc3.html (1502 words)

	Transistor-Transistor Logic (TTL)
		The emitter of the Vcc-side transistor (whose collector is tied to Vcc) is connected to the collector of the GND-side transistor (whose emitter is grounded) by a diode.
		The most basic TTL circuit has a single output transistor configured as an inverter with its emitter grounded and its collector tied to Vcc with a pull-up resistor, and with the output taken from its collector.
		This is due to the fact that when the output transistor (T4 in Figure 1) is turned off, there is a path for the stored charge in its base to dissipate through, allowing it to reach cut-off faster than a DTL output transistor.
	www.semiconfareast.com /ttl.htm (866 words)

	Digital Logic Gates Part-V
		In RTL (resistor transistor logic), all the logic are implemented using resistors and transistors.
		In DTL (Diode transistor logic), all the logic are implemented using diodes, and transistors.
		Q3 is called pull-up transistor, as it pulls the output voltage up, when it saturates and other is in cut-off (i.e.
	www.asic-world.com /digital/gates5.html (748 words)

	TTL - Time To Live, Transistor-Transistor Logic
		Transistor Transistor Logic was the initial implementation of the 74xxnnn series logic (TTL being the form with xx omitted).
		Different logic families are distinguished by such electrical characteristics as logic levels, input current, speed, power consumption, and the supply voltage required.
		TTL logic levels are 0V (low) and +5V (high).
	www.auditmypc.com /acronym/TTL.asp (542 words)

	Emitter coupled logic - Wikipedia, the free encyclopedia
		A bias configuration supplies a constant voltage at the midrange of the low and high logic levels to the differential amplifier, so that the appropriate logical function of the input voltages will control the amplifier and the base of the output transistor (this output transistor is used in common emitter configuration?).
		In electronics, emitter coupled logic (or ECL) is a design which uses transistors to steer current through gates which compute logical functions (as does every logic family).
		By comparison, TTL and related families use transistors as digital switches (ECL is also digital), where transistors are either cut off or saturated, depending on the state of the circuit.
	en.wikipedia.org /wiki/Emitter_coupled_logic (395 words)

	Digital Logic Gates Part-V
		In RTL (resistor transistor logic), all the logic are implemented using resistors and transistors.
		In DTL (Diode transistor logic), all the logic are implemented using diodes, and transistors.
		Q3 is called pull-up transistor, as it pulls the output voltage up, when it saturates and other is in cut-off (i.e.
	www.asic-world.com /digital/gates5.html (748 words)

	resistor
		Resistance is proportional to the length of the resistor and to the material's resistivity, a physical property of the molecules that comprise the resistor, and inversely proportional to cross-sectional area.
		The critical measurement of a resistor is its resistance, which serves as a ratio of voltage to current and is measured by the SI unit ohm.
		Resistors are used as part of electrical networks and incorporated into microelectronic semiconductor devices.
	www.fact-library.com /resistor.html (1082 words)

	Diode-transistor logic - Wikipedia, the free encyclopedia
		Diode-Transistor Logic (DTL) is a class of digital circuits built from bipolar junction transistors (BJT), diodes and resistors; it is the direct ancestor of transistor-transistor logic.
		See also: resistor-transistor logic (RTL), transistor-transistor logic (TTL), emitter coupled logic (ECL).
		This page was last modified 19:12, 22 September 2005.
	en.wikipedia.org /wiki/DTL (64 words)

	Digital Electronics
		DTL takes diode logic gates and adds a transistor to the output, in order to provide logic inversion and to restore the signal to full logic levels.
		Resistor-transistor logic gates use Transistors to combine multiple input signals, which also amplify and invert the resulting combined signal.
		A disadvantage of this circuit is the input resistor to the transistor.
	www.epanorama.net /links/digital.html (4766 words)

	Digital Logic Gates Part-IV
		Logic levels are the voltage levels for logic high and logic low.
		Logic families can be classified broadly according to the technologies they are built using.
		The time between the logic transition on an input and the corresponding logic transition on the output of the logic gate.
	www.asic-world.com /digital/gates4.html (1263 words)

	Bipolar Junction Transistor : Discount Electronics
		See live article Diode-transistor logic Diode-transistor logic (DTL) is a class of digital circuits built from bipolar junction transistors (BJT), diodes and resistors; it is the direct ancestor of transistor-transistor logic.
		See live article Transistor The transistor is a solid-state semiconductor device used for amplification and switching, and has three terminals: a small current or voltage applied to one terminal controls the current through the other two.
		A bipolar transistor is a sandwich of differently doped sections, either NPN or PNP.
	www.cobourgpuc.com /57-Bipolar-Junction-Transistor.html (930 words)

	logic - Wiktionary
		Logic is the art of the necessary consequence, and, as such, is very dependent on initial conditions.
		Logic is the basis of many principles including the scientific method.
		Politicians and philosophers tend to use a flawed logic, with the premise that whatever they want to prove is true.
	en.wiktionary.org /wiki/logic (206 words)

	Diode-transistor logic - Wikipedia, the free encyclopedia
		Diode-Transistor Logic (DTL) is a class of digital circuits built from bipolar junction transistors (BJT), diodes and resistors; it is the direct ancestor of transistor-transistor logic.
		A major advantage over the earlier resistor-transistor logic is the increased fanin.
		In practice this delay is often decreased by connecting the base of the transistor through a resistor to ground or a negative voltage.
	en.wikipedia.org /wiki/Diode-transistor_logic (242 words)

	Digital Logic Gates Part-IV
		Logic levels are the voltage levels for logic high and logic low.
		Logic families can be classified broadly according to the technologies they are built using.
		The time between the logic transition on an input and the corresponding logic transition on the output of the logic gate.
	www.asic-world.com /digital/gates4.html (1262 words)

	BYPASSING
		TTL (Transistor Transistor Logic) is saturating logic, i.e., a transistor is either fully off or fully on, and when it is fully on it is said to be, in Vsat.
		In a typical TTL logic device (gate, flip flop, counter, register, etc.), it is fair to say that at any one time: half of the transistors are ON, and the other half are OFF.
		Because there is "Distance" between any power source and the logic it powers, a "conductor" or "wire" of finite length is required between this power source and the logic.
	physics.usask.ca /~angie/ep326/lab6/bypass.htm (4847 words)

	Electronics:TTL - Wikibooks, collection of open-content textbooks
		It is the system based on combining transistors in such a way that they can be used for logic gates.
		Transistors in microprocessors, however, are microscopic as opposed to the discrete components used in consumer electronics and circuitboards.
		The two resistors in the circuit are for limiting current as to not destroy the transistor, and sometimes may not even be required depending on the transistor.
	en.wikibooks.org /wiki/Electronics:TTL (432 words)

	Transistor-Transistor Logic
		TTL is still used a lot when building ‘one off’ logic circuits as the gates are cheap and fairly robust (i.e.
		The main distinguishing features of the basic TTL family is that they demand a power rail which is very close to +5V, and they use a relatively high amount of current to drive their logic levels (below 1V for a logical ‘0’ or ‘low’, and above about 3.5V for a logical ‘1’ or ‘high’).
		A particular characteristic of TTL signals is that the inputs to a gate “float high” — i.e.
	www.st-andrews.ac.uk /~jcgl/Scots_Guide/datasheets/logic/TTL.html (572 words)

	notes.html
		Transistors are created by making junctions of silicon materials that have been ``doped'' with different kinds of conducting particles, n-type (electrons), or p-type (``holes'').
		The type of transistor and the way it is used to construct gates dramtically influences the performance of your circuits.
		When A switches to 1, the transistor acts like a short circuit, current flows through the resistor to ground dissipating most of the 5 volts in the resistor.
	www.parl.clemson.edu /~dstanzi/201notes/notes.html (1188 words)

	Logic Families
		The types of logic devices are classified in "families", of which the most important are TTL and CMOS.
		Integrated circuits in the TTL logic family have part numbers which are four to five digit numbers.
		TTL is the largest family of digital ICs, but the CMOS family is growing rapidly.
	hyperphysics.phy-astr.gsu.edu /hbase/electronic/logfam.html (340 words)

	RTL (Resistor-Transistor Logic)
		When the transistor switches OFF the current is low and the transition is very slow (think of it as an RCCCE decay, which is slow).
		When the transistor is ON the current is high and the state changes quickly.
	www.mines.edu /Academic/courses/physics/phgn317/lect03/sld002.htm (68 words)

	Transistor-transistor logic
		Transistor-transistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT), diodes and resistors.
		That family included logic gates (such as the 7400 quad NAND), flip-flops (such as the 7474 twin D-type flops), counters (such as the 74160 decade counter), binary adders and other simple subfunctions all of which were implemented as TTL circuits.
		TTL was largely relegated to glue logic applications, such as fast bus drivers on a motherboard, for instance, once CMOS technology had developed to a point that made it possible to economically integrate much more complex circuits on a single chip than with TTL technology.
	www.termsdefined.net /tr/transistor-transistor-logic.html (541 words)

	Logic families
		Logic families are groups of logic circuits that are based on particular types of elements (resistors, transistors, and so forth).
		RTL is normally constructed from discrete components (individual resistors and transistors).
		Additional transistors are used to produce the desired output.
	www.tpub.com /neets/book13/55k.htm (602 words)

	Process for extracting logic from transistor and resistor data representations of circuits - Patent 5210699
		The logic netlist is formed to serve as a logic simulation model having logic elements structured and patterned to follow the circuit representation at the transistor level, most commonly known as a netlist, which includes the resistors and the overall circuit interconnection.
		The logic is extracted such that the logic schematic is a model that structurally patterns the circuit representation of the transistor netlist and is capable of interfacing conventional logic simulators.
		The logical representation is extracted directly from the transistor netlist, which may be indicative of either ECL or CML circuitry, to generate automatically a corresponding logic representation of the physical implementation of the circuit.
	www.freepatentsonline.com /5210699.html (6906 words)

	3. The logic gates
		Logic gates are constructed using a number of different semiconductor device types.
		The term logic gate is used because it behaves according to rules which can be described by logical, algebraic statements.
		The load resistor is coupled between ground (0V) and the common connection between the cathode of the diodes.
	hagar.up.ac.za /catts/learner/andria/tme880dice3gates.html (650 words)

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