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[FAQ] What does 'partial power down' or 'Ioff' mean in the datasheet?

The "Ioff" specification in the electrical characteristics table is only in the datasheet of devices that have the special feature of "partial power down" - also known as "back-drive protection."

Partial power down protection is the lowest level of live-insertion isolation, as defined by the application report "Logic in Live-Insertion Applications."

Partial power down essentially states that, if the supply of a device is held at 0V (any supply for multi-supply devices), then the input and output pins of said device will enter a high impedance state. The maximum leakage current in this high-impedance state is defined by the Ioff specification in the datasheet.


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