When powered on, each switch conducts equally well in both directions, and each switch has an input signal range that extends to the supplies. The digital inputs are compatible with 3V logic inputs over the full operating supply range. When power supplies are absent, the switch remains in the off condition, and the switch inputs are high impedance. Under normal operating conditions, if the analog input signal levels on any Sx pin exceed VDD or VSS by a threshold voltage, VT, the switch turns off. Input signal levels up to +55V or −55V relative to the ground are blocked, in both the powered and unpowered conditions.