Semiconductor integrated circuit device

Abstract

A semiconductor integrated circuit device of the invention includes: a first power supply system including a first circuit connected with a first power supply line; a second power supply system including a second circuit connected with a second power supply line; a signal line connected between the first circuit and the second circuit, and transmitting a signal between the first circuit and the second circuit; a discharge path which is different from the signal line and through which an abnormal current flows when an abnormal voltage is applied between the first power supply system and the second power supply system; a detecting circuit for detecting a potential difference between two positions in the discharge path through which the abnormal current flows when the abnormal voltage is generated; and a protective circuit that operates based on an output of the detecting circuit to suppress a voltage increase of the signal line.

Dependencies are inferred from the claim text.