Positive emitter-coupled logic
- Positive emitter-coupled logic
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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.
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