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| Octocoupler Strange Open State Behaviour |
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| SiliconWizard:
--- Quote from: mattg443 on October 29, 2018, 08:15:02 pm ---That was a bad example in terms of isolation requirement. One example of where we want to use the switch with isolation is to tie the TX+ to the RX+ and TX- to the RX- of an RS422 line, to convert between RS422 and RS485 with isolation from the control side. --- End quote --- You should maybe show us with a diagram what you want to achieve - still a bit unclear to me. All I can say so far is that with an RS485 transceiver, you can actually disable its output (which is the whole point), which will make it high impedance. There is no need for an extra switch, you could just control the output driver enable with an isolated digital signal, combined with the existing enable signal. |
| David Hess:
The leakage might not be a problem but the capacitance across the output is more than 100 picofarads at low voltages. This is a common issue with analog multiplexers and made worse in this case because of the large output devices used. |
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