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SN74LVC125A-Q1: For long distance of SPI

Lee, Sam
Expert 5215 points
Part Number: SN74LVC125A-Q1

Hello team,

Is it possible to use the buffer such as SN74LVC125A-Q1 for the SPI communication with 3m cable between master and slave? 

Or, can you recommend any automotive devices for the 3m SPI transmission (2ch x 4wire SPI)?

 

Thanks,

Sam Lee

  • +1
    Guru 259550 points

    LVC is the logic family with the strongest outputs. However, 3 m might be too long for single-ended signals, and in any case, the total capacitance of the cable limits the achievable speed.

    It might be possible, but you have to check the signal quality with an oscilloscope.

    If the LVC buffer does not work, consider using differential signals like LVDS or RS-422.