CIRCUIT FOR RESETTING INITIALIZATION CIRCUIT TO DETECT DROP IN SUPPLY VOLTAGE

摘要

PURPOSE: To obtain a circuit capable of being formed simply of a limited superficial area by the use of a threshold circuit having an input terminal to be connected with a high supply terminal, an output terminal for applying a desired signal, and a supplying input terminal. CONSTITUTION: In a circuit for detecting the applied voltage drop applied between the high supply terminal A1 of an integrated circuit and a low supply terminal A2, there is provided with a threshold circuit I comprising an input terminal to be connected with a high applying terminal A1, an output terminal for supplying a desired signal (OUT), and an inverter having a supply input terminal. Also, there are provided with an MOS type capacitor C being connected between supply input terminals and connected to a low supply terminal A2 in its first terminal, and an N-channel MOS type transistor T being connected with a second terminal of the capacitor C in its source and inter connected to the high supply terminal A1 in its drain and gate. While the MOS integrated circuit operates, an initialization circuit C2 is used for resetting.