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SN65HVD78: behaviour when supply voltage is switched off

Part Number: SN65HVD78
Other Parts Discussed in Thread: THVD1450


my customer would like to use the SN65HVD78 in a new design and had a question:

he would like to know how the device would behave (digital input & output) in case its supply voltage was cut off during normal operation mode (using a load switch for example)? 

This is rather not very common but it is something he is foreseeing in his system should there be a fault even for example and he wanted to know how the device would behave.  

Thank you.