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TLK2711-SP: External Powered Transmitter Driving TLK2711-SP in Disabled Mode

Carl Spurgers
Prodigy 40 points
Part Number: TLK2711-SP

From the TLK2711-SP datasheet, there's a limitation cited where an unpowered receiver should not be driven by an external transmitter for more than 10 hours cumulative over the lifetime of the device.  Does this same limitation apply to a powered receiver which has the ENABLE pin driven low (so that the device is powered, but disabled)?

It appears the ENABLE pin doesn't affect functionality of the high-speed serial receiver, just the parallel output (RXDn), but I wanted to confirm.

Thanks!

  • 0
    TI__Guru 62930 points

    Carl,

    This limitation does not exist for the powered case.

    The reason that there is a limitation on driving the serial inputs when device is powered down is due to ESD protection devices that connect to the VDDA rail.  In the absolute maximum ratings section, the serial inputs are constrained to be from -0.35 to VDDA +0.35.  When VDDA=0, then it would be likely that an actively driven input would violate this. 

    When VDDA is powered, then this limitation is gone.

    If this answers your question, please click "This Resolved My Issue"
    Regards,
    Wade