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LSF0101: one output which is open-drain, and one output which is push-pull

Bonnie Chen
Intellectual 1160 points
Part Number: LSF0101
Other Parts Discussed in Thread: SN74LVC1T45, LSF0102, TXS0102

team,

we need to look for a buffer/level shifter that has one output which is open-drain, and one output which is push-pull and meets the MDIO/MDC electrical requirements, can you advice if LSF0101 ok to use?  

or any other recommend?

  • 0
    TI__Genius 16735 points

    Hi,

    Firstly, I am not sure on the MDIO/MDC electrical requirements so please clarify.

    The LSF0101 is a level shifter and not a buffer so if you need any output drive strength I don't recommend that device.

    I need to know what voltages you are looking to level from and to. I would also need to know what are your IOH, IOL requirements if any for the output drive strength.

    We don't have a device that has both an open-drain and a push-pull output. I am curious to know the use case? Maybe I can suggest another solution.

    Thanks!

    -Karan

  • 0
    Guru 318050 points

    en.wikipedia.org/wiki/Management_Data_Input/Output#Electrical_specification says that the clock is unidirectional, and the data, bidirectional.

    It would be possible combine the SN74LVC1T45 and the LSF0101.

    Using the LSF0102 would require a very strong pull-up resistor on the clock line, which would waste power.

    If you want to use a single device for both signals, I would recommend the TXS0102, which allows open-drain bidirectional communication, and whose edge accelerators should be able to drive the clock correctly. Its internal pull-up resistors should be sufficient for a single PHY.