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Original question:

SRC4382 unused input termination

SRC4382: Unused Pins Configuration (LOCK, RXCKO, SYNC, BLS, AESOUT, TX+, TX-, GPO1-4, MCLK, INT, RDY, MUTE)

Shinichi Inoue
Guru 20456 points
Part Number: SRC4382

Dear Specialists,

My customer is designing SRC4382 and has a question about unused pins treatment .

I would be grateful if you could advise.

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Could you please let us know unused pins configuration.

Regarding LOCK, RXCKO, SYNC, BLS, AESOUT, TX+, TX-, GPO1-4, MCLK, INT, RDY, MUTE.

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I appreciate your great help in advance.

Best regards,

Shinichi

  • +1
    TI__Mastermind 23780 points

    Hello, I would suggest them to go through the data sheet and see the function of any un used pins ( most of these  are OUTPUT pins). If it is an output or monitor pin ( like LOCK, RDY, TX+, TX- and etc ) they can just leave them float and most of the time even termination is not needed. For un-used pins that are INPUT,  they should  pay attention  if a pin can effect them or not. For example a pin like MUTE, is safer to connect it via a pull down resistor to GND and leave it float as I am not sure there is an internal PU or PD resistor at the pin.

    Beside datasheet that has a good description of each pin and its function, I have also attached the user guide with EVM schematics that they can use as a reference to work with this part.

    Kind Regards,

    arash
    SRC4382 User guide sbou038a.pdfsrc4382.pdf

  • 0 in reply to Arash Loloee
    Guru 20456 points

    Hi Arash,

    Thank you for your reply and polite explanation.

    I'll share your suggestion  and application note with the customer.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi