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TMUX4051: Can TMUX4051 be used as a multiplexer for RS232C interface?

Kazuya Nakai59
Guru 20560 points
Part Number: TMUX4051
Other Parts Discussed in Thread: TMUX4827, TPS65130, GD75232

Tool/software:

Hello guys,

One of my customers is looking for a multiplexer of 1:8 for RS232C interface. (8 signal in/output <-> RS232C driver/receiver)
They think TMUX4051 could be used.
Can TMUX4051 be used as a multiplexer for RS232C interface? 

Your reply would be much appreciated.

Best regards,
Kazuya.

  • 0
    Guru 265270 points

    Do you want to multiplex the logic-level signals or the RS-232 bus signals? The latter can have valid signals of up to ±15 V and must allow up to ±25 V, so the TMUX4051 could not be used (unless you know that all your RS-232 devices actually use lower voltages).

  • 0 in reply to Clemens Ladisch
    TI__Genius 13220 points

    Hello Kazuya,

    Could you please answer Clemens questions?

    This will help us decide if the TMUX4051 will work for your application.

    Also what supply voltage are you planning to operate the TMUX4051 on?

    Regards,

    Kameron

  • 0 in reply to Kameron Hill
    Guru 20560 points

    Kameron, Clemens,

    Thank you very much for your reply.

    They want a multiplexer which can be received RS232C signal directly.
    So the RS232C signal input voltage range=+/-6V~+/-12V.
    Also 1:8 multiplexer select signal voltage=5V and 1:8 multiplexer operation voltage=5V.

    I understood that TMUX4051 can not be used.
    Do you have any device can suit their requirements?

    Thank you again and best regards,
    Kazuya.

  • 0 in reply to Kazuya Nakai59
    Guru 265270 points

    The TMUX4827 does support these voltages, but is only 1:2; you would have to use multiple ones.

    All these switches and RS-232 transceivers use charge pumps to generate the higher voltages. It might be worthwhile to create these voltages yourself (e.g., TPS65130/1) and use them to supply plain, cheap switches (e.g., TMUX4051) and RS-232 transceivers (e.g., GD75232).

  • 0 in reply to Clemens Ladisch
    TI__Genius 13220 points

    Hello Kayuza,

    I agree with Clemens that using a beyond the supply multiplexer like the TMUX4827 would be ideal for this design.

    Please look at Clemens suggestion and I can help if any other assistance is needed

    Regards,

    Kameron