Positive emitter-coupled logic

Positive emitter-coupled logic

In der Digitaltechnik bezeichnet der englische Begriff positive emitter-coupled logic (kurz: PECL, dt. positive Emitter-gekoppelte Logik) ein Signalstandard zur Darstellung eines zweiwertigen Signals als Logikpegel. Er wird aufgrund der hohen Schaltgeschwindigkeiten, die mit PECL erreicht werden kann, vorwiegend zur Übertragung eines Taktsignals eingesetzt. PECL ist wie LVDS eine differenzielle Signalisierung, zur Übertragung wird ein Leitungspaar (als _n und _p bezeichnet) benötigt. Die beiden logischen Zustände werden durch die unterschiedliche Potentialdifferenz und damit unterschiedliche Stromrichtung codiert. Das PECL-Leitungspaar muss am Empfänger terminiert werden.

Logikpegel bei PECL
Vee Vlow Vhigh Vcc
GND (0 V) 3,4 V 4,2 V 5,0 V

Während PECL für 5-V-Systeme eingesetzt wird, ist für die auf 3,3 V entwickelte Schaltkreisfamilien LVPECL (low-voltage PECL) im Einsatz. PECL wurde aus der emittergekoppelten Logik (ECL) abgeleitet.

Weblinks


Wikimedia Foundation.

Игры ⚽ Поможем написать реферат

Schlagen Sie auch in anderen Wörterbüchern nach:

  • Positive emitter-coupled logic — Positive emitter coupled logic, or PECL, is a further development of the emitter coupled logic (ECL) technology and requires a positive 5V supply instead of a negative 5V supply. The Low voltage positive emitter coupled logic (LVPECL) is an… …   Wikipedia

  • Low-voltage positive emitter-coupled logic — Low voltage positive emitter coupled logic, or LVPECL, is a power optimized version of the Positive emitter coupled logic (PECL) technology, requiring a positive 3.3V instead of 5V supply. LVPECL is a differential signaling system and mainly used …   Wikipedia

  • Emitter-coupled logic — Motorola ECL 10,000 basic gate circuit diagram[1] In electronics, emitter coupled logic (ECL), is a logic family that achieves high speed by using an overdriven BJT differential amplifier with single ended input, whose emitter current is limited… …   Wikipedia

  • Logic family — In computer engineering, a logic family may refer to one of two related concepts. A logic family of monolithic digital integrated circuit devices is a group of electronic logic gates constructed using one of several different designs, usually… …   Wikipedia

  • Transistor–transistor logic — (TTL) is a class of digital circuits built from bipolar junction transistors (BJT), and resistors. It is called transistor–transistor logic because both the logic gating function (e.g., AND) and the amplifying function are performed by… …   Wikipedia

  • Diode–transistor logic — DTL redirects here. For other uses, see DTL (disambiguation). Diode–transistor logic (DTL) is a class of digital circuits that is the direct ancestor of transistor–transistor logic. It is called so because the logic gating function (e.g., AND) is …   Wikipedia

  • Diode logic — (DL) or diode resistor logic constructs Boolean logic gates from diodes acting as electrically operated switches. While diode logic has the advantage of simplicity, the lack of an amplifying stage in each gate limits its application. Not all… …   Wikipedia

  • NMOS logic — N type metal oxide semiconductor logic uses n type metal oxide semiconductor field effect transistors (MOSFETs) to implement logic gates and other digital circuits. NMOS transistors have four modes of operation: cut off (or sub threshold), triode …   Wikipedia

  • Depletion-load NMOS logic — Depletion load nMOS/NMOS (n channel metal oxide semiconductor) is a form of nMOS logic family which uses depletion mode n type MOSFETs as load transistors as a method to enable single voltage operation and achieve greater speed than possible with …   Wikipedia

  • Input/output standards — This is a list of electrical input/output standards that have moreor less well defined electrical properties like operating voltage, drivingcurrent, level switching behavior, circuit implementation etc., or are (industry) standards.Different… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”