Semiconductor integrated circuit device equipped with protective system for directly discharging surge voltage from pad to discharging line.

摘要

A protective system (16) incorporated in a semiconductor integrated circuit device has a shared discharging line (16a) and a plurality of protective circuits (16c-16h) each having a diode (D) and a lateral bipolar transistor (CL) coupled between an associated pad (15c/12a/15i/14c/15k) and the shared discharging line (16a), and surge voltage applied to the pad is discharged through the associated protective circuit to the shared discharging line so that a main circuit (12/13) is not destroyed by the surge voltage.