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Devices that function when the power has been disconnected would be wonderful energy-saving devices.


These are signal pins, not power pins. The device is still receiving power when the switch is "off", all the switch does is provide a signal to the pins that tell it to disable itself.


Also signal input can in certain cases power devices[1].

[1] https://youtu.be/1jOJl8gRPyQ?t=502


Which still allows potential side-channel attacks in circuitry.




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