Patent ID: 6437614
Filing Date: 2002-08-20
Classification: H03K

Abstract:
A low voltage reset circuit device for detecting a voltage level of a voltage source to automatically generate a system low voltage reset signal, the low voltage reset circuit comprising:a first low voltage reset circuit using a bandgap circuit to generate a first reference voltage for being compared with the voltage level of the voltage source, so as to output a first reset signal when the voltage level of the voltage source is smaller than a first voltage; a second low voltage reset circuit using a threshold voltage of a MOS transistor as a second reference voltage to be compared with the voltage level of the voltage source, so as to generate a second reset signal when the voltage level of the voltage source is smaller than a second voltage, wherein the second voltage is between the first voltage and a lowest voltage at which the bandgap circuit can operate; and a logic circuit for generating a system low voltage reset signal when one of the low voltage reset circuits generates a reset signal.