Talk:Emitter-coupled logic

The voltages for logic 1 and 0 of normal ECL (particularly ECL 10,000 series) are missing. The section "Power supplies and logic levels" has nice descriptions of other things, but completely fails to give any figures for logic levels. The subsection on PECL (which I've never heard of before) has a nice table, so I don't understand why there's nothing for common ECL. eekee (talk) 14:26, 5 November 2017 (UTC)

Found the data; will add when I'm not so tired, maybe tomorrow. Do I delete this section when I'm done? eekee (talk) 16:02, 5 November 2017 (UTC)

:The article does not have a section devoted to just the ECL 10,000 series, or any of the variants that could be directly connected to that series. It is more generic than that. For example, it also applies to the ECL circuits used in IBM mainframes which were incompatible with the circuits sold commercially (and the mainframe families were incompatible with each other). So there is no place to put the logic levels, because each major ECL variant is different. Jc3s5h (talk) 13:44, 6 November 2017 (UTC)

::That's logical, but why then does it have a section and a level table for PECL? I'm not sure whether to suggest these technical details should be added to or removed, especially considering the next discussion point too. eekee (talk) 11:50, 26 June 2018 (UTC)

It is also not entirely clear what V_cm means in this table for LVPECL. Can some clarification be added for at least that one? The other levels are obvious to me, but I also have more tech experience so maybe the other levels should be explained/linked as well. Thanks. Busfault (talk) 14:15, 1 May 2018 (UTC)

:{{ping|Busfault}} I believe V_cm is the common-mode voltage compliance. The inputs are differential, so they can have a common-mode voltage swing in addition to their logic levels. Glrx (talk) 21:18, 21 May 2018 (UTC)

So far I couldn't find any sources indicating that ECL is in production or use. It seems like Motorolla doesn't produce them anymore. Should we write in the lead that the logic family is mostly obsolete? AXONOV (talk) ⚑ 10:05, 11 April 2025 (UTC)

:I looked at DigiKey and it seems possible to order ECL parts. The part I looked at was MC1012P, a NOR gate. That said, they may still be offered because people are using them for repairs, or for products that aren't worth redesigning. I don't know if anyone is putting ECL into new products. Jc3s5h (talk) 14:23, 11 April 2025 (UTC)

:Thanks for looking that up. It seems like discrete ECLs have very limted usage. I think we should say something on that in the lead. AXONOV (talk) ⚑ 15:14, 11 April 2025 (UTC)