Timeline for Are activated open-collector and open-drain circuits wasting energy?
Current License: CC BY-SA 4.0
9 events
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| Mar 4, 2019 at 5:59 | comment | added | TemeV | @Toor yes that is also true. As always, you have to choose the compoment so that it fits to the requirements. The components are always a trade off of something. In this case flexibility and price has been prioritized over efficiency / switching speed (leaving the efficiency vs. switching speed trade off for the user) | |
| Mar 3, 2019 at 19:02 | history | edited | DKNguyen | CC BY-SA 4.0 |
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| Mar 3, 2019 at 19:00 | comment | added | DKNguyen | @TemeV Yes, OTOH, the time to charge the parasitic capacitances of the line and of the input will be increased so you might not reach your rise time requirements. | |
| Mar 3, 2019 at 7:45 | comment | added | TemeV | I'd add that if you use a fairly large resitor, 10k or 100k, the wasted current in the resistor is negligible compared to the energy wasted in the optocoupler LED | |
| Mar 2, 2019 at 22:20 | vote | accept | Gearoid Murphy | ||
| Mar 2, 2019 at 21:31 | comment | added | DKNguyen | You can connect multiple open collector outputs to a line with one-pull-up resistor and if any output pulls it low, the entire line goes low without the outputs fighting each other.. Logic OR...technically NOR. | |
| Mar 2, 2019 at 21:30 | history | edited | DKNguyen | CC BY-SA 4.0 |
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| Mar 2, 2019 at 21:26 | comment | added | Gearoid Murphy | What do you mean by "inherent ORing of signals" ? | |
| Mar 2, 2019 at 21:23 | history | answered | DKNguyen | CC BY-SA 4.0 |