Transistor–transistor logic (TTL) is a logic family built from bipolar junction transistors. Its name .. Jump up ^ Marston, R. M. . Modern TTL Circuits g: circuitos integrados. The following is a list of series digital logic integrated circuits. The original series Some TTL logic parts were made with an extended military-specification Digital Integrated Circuits, National Semiconductor Corporation, January ; Logic/Memories/Interface/Analog/Microprocessor/Military Data Manual. circuits, Motorola offers the FAST Schottky and TTL family. and output drive factors of all products described in this handbook are related to these definitions.
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These parts are prefixed with 54 instead of 74 in the part number. A short-lived 64 prefix on Texas Instruments parts indicated an industrial temperature range; this prefix had been dropped from the TI literature by Surface mount parts with a single gate often in a 5-pin or 6-pin package are prefixed with G instead of Some manufacturers released some series equivalent CMOS circuits with a 74 prefix, for example the 74HC was a replacement for the with slightly different electrical characteristics different power supply voltage ratings, higher frequency capabilities, lower "on" resistances in analog switches, etc.
See List of series integrated circuits. Conversely, the series has "borrowed" from the series - such as the CD and CD being pin-for-pin functional replacements manual circuitos integrados ttl 74C and 74C A few alphabetic characters manual circuitos integrados ttl designate a specific logic subfamily may immediately follow the 74 or 54 in the part number, e.
Not all functions are available in all families. In a few instances, such as the andthe same suffix in different families do not have completely equivalent logic functions.
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Another extension to the series is the xxx variant, representing mostly the bit wide counterpart of otherwise 8-bit-wide "base" chips with the same three ending digits.
Some xxx parts, however, do not have a direct counterpart from the standard 74xxx range but deliver new functionality instead, which needs making use of the xxx series' higher pin count. For more details, refer primarily to the Texas Instruments documentation mentioned in the References section.
Not only did others make compatible TTL parts, but compatible parts were made using many other manual circuitos integrados ttl technologies as well.
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The most recently introduced family 74Fxx is still sold today[ when? Typically, TTL chips integrate no more than manual circuitos integrados ttl few hundred transistors each.
Functions within a single package generally range from a few logic gates to a microprocessor bit-slice. TTL also became important because its low cost made digital techniques economically practical for tasks previously done by analog methods.
Most computers used TTL-compatible " glue logic " between larger chips well into the s. Until the advent of programmable logicdiscrete bipolar logic manual circuitos integrados ttl used to prototype and emulate microarchitectures under development.
TTL inputs are the emitters of bipolar transistors. In the case of NAND inputs, the inputs are the emitters of multiple-emitter transistorsfunctionally equivalent to multiple transistors where the bases and collectors are tied together. Inputs both logical ones.
When all the inputs are held at high voltage, the base—emitter junctions of the multiple-emitter transistor are reverse-biased. This is because the transistor is in reverse-active mode. An approximately constant current flows from the positive rail, through the resistor and into the manual circuitos integrados ttl of the multiple emitter transistor.
An input logical zero. Note that the base—collector junction of the multiple-emitter transistor and the base—emitter junction of the output transistor are in series between the bottom of the resistor and ground. If one input voltage becomes zero, the corresponding manual circuitos integrados ttl junction of the multiple-emitter transistor is in parallel with these two junctions.