For most analog switches, if there is no additional fault protection, the signal on the switch should stay within the range of the positive and negative supply voltages. Otherwise, latch-up can occur, creating a short between the signal input pin and the power supply pins. This results in a large flow of current which may damage the device.
In the Absolute Maximum Ratings section on p. 2 of the MAX4051 datasheet, the absolute maximum rating for each pin is listed. We recommend no signals to be applied to the input pins when the device is not powered.
In the Absolute Maximum Ratings section on p. 2 of the MAX4051 datasheet, the absolute maximum rating for each pin is listed. We recommend no signals to be applied to the input pins when the device is not powered.