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SRC4184: Initializing the device upon power up

Gregory Duperon
Expert 6020 points
Part Number: SRC4184

I have a customer using the device in slave mode on all four interfaces.

Customer has a question regarding /RST pin toggling upon startup to assert device reset sequence.  Is the 500ns min delay between toggling /RST low->high necessary for functionality?

Without toggling /RST with clocks active, register settings will not be flushed to default, correct?

Thanks.

  • 0
    TI__Expert 5645 points
    Dear Gregory,
    SRC4184 does not have internal POR (Power-on Reset) and hence it's required to force a reset sequence after power-up in order to initialize the device. This is achieved by making sure the reference clock inputs are active, with external clock sources supplying a valid reference clock signal AND asserting RST low for a minimum of 500ns and then bring RST high again to force a reset. This is a required step for device to operate normally and not result in any unexpected operation.

    And as far as register resetting to default value, YES the statement is accurate that the registers default only after device reset. Thanks.

    Best regards,
    Ravi