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Logic family
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==Emitter-coupled logic (ECL)== {{Main|Emitter-coupled logic}} 1961 IBM invented ECL (also knon as current-mode logic (CML)) as [[current steering logic]] for use in the [[transistor]]ized [[IBM 7030 Stretch]] computer, where it was implemented using discrete components. In 1962 Motorolla introduced their first line of ECL integrated circuit devices referred to as ''MECL 10000.<ref name=":1">{{cite book |last=Blood Jr. |first=William R. |url=http://www.bitsavers.org/components/motorola/_dataBooks/1972_Motorola_MECL_System_Design_Handbook_2ed.pdf |title=MECL System Design Handbook |date=1972 |publisher=[[Motorola]] Semiconductor Products |edition=2nd |page=vi |oclc=17253029 |via=Bitsavers}}</ref>'' MECL required negative power supply.''<ref name=":1" />'' A subsequent development of ECL using positive-supply includes later ''PECL'' and ''LVPECL''. ECL uses an overdriven [[bipolar junction transistor]] (BJT) differential amplifier with single-ended input and limited emitter current.
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