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TS5A623157: can be used as I2C switch?

Will Wang47
Expert 5530 points
Part Number: TS5A623157
Other Parts Discussed in Thread: TMUX154E,

Hi team,

Could TS5A623157 be used as I2C mux switch? Customer want to use as same function with TMUX154E as I2C mux switch. Could you help comment if this is OK?

Best regards,

Will

  • 0
    TI__Genius 10974 points

    Hi Will,

    I would like to get some more information on the exact application before recommending a part for replacement. What supply rail is available in the system and what is the voltage level of the I2C protocol you are using? Also, what bandwidth will the I2C be operating at?

    The TMUX154E is a beyond the rail part (this means the input voltage can be greater than the power supply) and also has powered off protection. The TS5A623157 does not have a powered off protection feature and does not support beyond the rail operation either.

    If you can answer my above questions, I can help suggest a better part for your use case.

    Thanks!

    Bryan

  • 0 in reply to Bryan Marshall
    TI__Expert 5530 points

    Hi Bryan,

    I2C mux supply voltage 3.3V, I2C voltage level 3.3V, communication speed 400kHz. i2c signal will only appear when TS5A623157 supply voltage is there. TS5A623157 parasitic capacitance is 14.5pF, much small than i2c spec require 400pf.

    Based on this, could you help check 

    Best Regards,

    Will

  • 0 in reply to Will Wang47
    TI__Genius 10974 points

    Hi Will,

    Given those requirements, I would recommend the TS5A23159, This is also a 2:1x2 channel multiplexer that can support the I2C communication protocol you are using and has the powered off protection feature like the TMUX154E. Also has plenty of bandwidth to support this I2C application.

    Let me know if you have any other questions.

    Thanks!

    Bryan