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AM2434: Question on impedance matching for PRU GPIO

Keito Katafuchi
Intellectual 295 points
Part Number: AM2434


Tool/software:

What is the typical output impedance of one of the PRU GPIOs?

Specifically the two pins used for the EGPO shift-out functionality.

I want to minimize poor signal quality at high switching speeds, and matching trace impedances / minimizing parasitics is a good place to start.

  • 0
    TI__Guru**** 197739 points

    Hello Keito Katafuchi

    Thank you for the query.

    The PRU IO buffer type is LVCMOS and the nominal impedance is 60R.

    Regards,

    Sreenivasa 

  • 0 in reply to Kallikuppa Sreenivasa
    TI__Guru**** 197739 points

    Hello Keito Katafuchi,

    Please refer additional inputs i received from the expert.

    The IOs associated with the LVCMOS buffer type have a typical source impedance of 60 ohms, and the IOs associated with the SDIO buffer types have a typical source impedance of 40 ohms.  We do not define the source impedance range. The customer should use the IBIS models in a simulation if they need a better understanding the buffer drive capabilities.

    Regards,

    Sreenivasa