High voltage detecting circuit

摘要

A high voltage detecting circuit included in a semiconductor device having terminals for generating a control signal in order to start a specific mode of the semiconductor device when a potential of a specific mode signal higher by a predetermined value than a normal input voltage having a predetermined range is applied to at least one of the terminals of the semiconductor device. The high voltage detecting circuit comprises a level shift means having an input end and an output end and connected between a blocking transistor and a discrimination circuit for obtaining a potential of the output end lower by a level shift valve than a potential of the input end. Consequently, the high voltage detecing circuit will not generate an error control signal even if the semiconductor device is switched ON and a power line potential of the device is gradually increased while a normal mode signal of the normal input voltage is continuously applied to the terminal of the semiconductor device.