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SN65LVDT33: Differential transceiver being powered up while the receiving transceiver is not powered up

Saxon ZumBerge
Prodigy 90 points
Part Number: SN65LVDT33
Other Parts Discussed in Thread: SN65LVDS31,

Tool/software:

I have a differential transceiver (SN65LVDS31 ) being powered up while the receiving transceiver (SN65LVDT33) is not powered up. 

The main concern is causing a latch-up condition and possibly damaging the receiving transceiver. 

-  Has there been any evaluation of this risk?

-  Is this considered a safe practice, or should we try and mitigate this in some way?

  • 0
    Guru 316780 points

    The absolute maximum ratings allow this, even when VCC is zero.

  • 0
    TI__Genius 9736 points

    Hi Saxon,

    The SN65LVDT33 will not be damaged if you apply an input signal when it is unpowered. Going off of what Clemens said, you can see this in the abs max and recommended operating conditions table where the max voltage is a static number. For example if the device was at risk of being damaged when a signal is applied while unpowered, the A or B voltage range would be -1 V to Vcc instead of -1V to 6V. 

    Regards,

    Matt