INPUT BUFFER CIRCUIT AND SEMICONDUCTOR DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent breakdown of a low voltage-withstanding transistor receiving an input signal with a large potential level.SOLUTION: In a transistor 11 receiving an input signal at a gate, a drain or a source is connected to a back gate. A voltage change part 16 changes a voltage applied to the drain or the source in accordance with a potential level of the input signal so that a potential difference between the gate of the transistor 11 and the drain or the source becomes equal to or less than a voltage-withstanding electric voltage of the transistor 11.