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SN54ACT244: turn on current of input clamp diode

Part Number: SN54ACT244

Dear design support team.

What is turn on current of positive input clamp diode?

when the supply is off, I am trying to protect reverse VCC via positive input clamp diode.

When the power is off and there is voltage on the input, I want to prevent the reverse VCC flowing through the positive input clamp diode.

(e.g.using high series resistor placement)

thank you as always