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TMUX6219: Can TMUX6219 be used for RS485 termination resistor connecting and dis-connecting?

Kazuya Nakai59
Guru 20780 points
Part Number: TMUX6219
Other Parts Discussed in Thread: TMUX6211

Hello guys,

One of my customers is looking for a analog switch which can be used for RS485 termination resistor connecting and dis-connecting like LTC2873 or MAX13450E.
LTC2873
https://www.analog.com/media/en/technical-documentation/data-sheets/ltc2873.pdf
MAX13450E
https://datasheets.maximintegrated.com/en/ds/MAX13450E-MAX13451E.pdf

They have a question as the following. Could you give me your reply for them?

Q.  Can TMUX6219 be used for RS485 termination resistor connecting and dis-connecting?

Your reply would be much appreciated.

Best regards,

Kazuya.

  • 0
    Guru 281010 points

    Yes; you can use any switch that is able to handle the voltages that actually occur on the bus.

  • 0 in reply to Clemens Ladisch
    TI__Mastermind 28088 points

    Hey Kazuya,

    I'm looking to understand the use case here more. What is the purpose of the 2:1 mux with the termination? As opposed to a 1:1 like the TMUX6211. It also looks like the transceivers have switchable termination integrated. That being said, to answer the question, as Clemens mentioned, as long as the switch can handle the voltage being applied it should be fine. For RS485, this is typically -7 to 12V. However, the caveat here is that you'll need a dual supply to power the mux up which should encompass the voltage range being passed through as well. So as long as you can power the chip up, you should be able to pass any voltage that is within the spec limits of the datasheet.

    Thanks,
    Rami