Potential detecting circuit and semiconductor integrated circuit

摘要

A constant current source (1) is provided between a power supply (VCC) and an intermediate node (N1) and supplies a reference current (IR) which is a constant current between the power supply (VCC) and the intermediate node (N1). A variable resistor (2) is provided between the intermediate node (N1) and a comparison potential (VL) and its resistance value can be set to a desired value. A current flowing in the variable resistor (2) is a comparison current (IC). An amplifier (3) has an input connected to the intermediate node (N1) and amplifies a potential from the intermediate node (N1) to output a level detection signal (GE). Having this configuration, a potential detecting circuit which ensures a stable and controllable detection level is provided.