Wired transceiver with overvoltage protections

A wired transceiver, comprising:

• an output stage, operating in one of a first mode and a second mode according to a mode control signal, transmitting a plurality of output signals to a plurality of output pads and receiving a first set of bias voltages to provide a first overvoltage protection in the first mode, and stopping transmitting the output signals and receiving a second set of bias voltages to provide the overvoltage protection in the second mode;
• an input stage circuit, receiving a plurality of input signals from the output pads when the output stage circuit operates in the second mode, and attenuating the input signals to provide a second overvoltage protection;
• and
• a terminal resistor circuit, coupled between the output pads, in the first mode, forming an open circuit according to a plurality of first switching signals and a plurality of second switching signals and receiving a reference voltage to provide a third overvoltage protection, and in the second mode, selectively turned on according to the first switching signals and the second switching signals to provide a terminal resistor and receiving the reference voltage to provide the third overvoltage protection,
• wherein, levels of the first switching signals in the first mode are different from levels of the first switching signals in the second mode, and levels of the second switching signals in the first mode are different from levels of the second switching signals in the second mode,
• wherein the terminal resistor circuit comprises:
• a first resistor array;
• a first switch array, coupled between a first output pad of the output pads and a reference node via the first resistor array, selectively turned on according to the first switching signals and the second switching signals;
• a second resistor array:
• a second switch array, coupled between a second output pad of the output pads and the reference node via the second resistor array, selectively turned on according to the first switching signals and the second switching signals;
• and
• a voltage driver, outputting the reference voltage to the reference node according to the mode control signal to provide the third overvoltage protection,
• wherein the first switch array comprises:
• a first transistor, coupled to a resistor in the first resistor array, selectively turned on according to a first signal of the first switching signals;
• and
• a second transistor, coupled between the first transistor and the reference node, selectively turned on according to a second signal of the second switching signals,
• wherein the first transistor and the second transistor have different conductivity types.