Patent ID: 6747907
Filing Date: 2004-06-08
Classification: G11C

Abstract:
A voltage detection level correction circuit, comprising:a power supply voltage detection circuit having a reference potential generation circuit for generating a constant reference potential that is independent of a power supply voltage, a divided voltage potential generation circuit for generating a divided voltage potential gained by dividing said power supply voltage according to a constant ratio and a differential amplification circuit for comparing said reference potential with said divided voltage potential and for outputting an output signal in case that said divided potential is lower than said reference potential; a non-volatile memory which stores correction data for correcting said reference potential and which is converted to an inactive condition in response to said output signal of said differential amplification circuit; a data latch circuit for storing said correction data read out from said non-volatile memory; and a control circuit for reading out said correction data from said non-volatile memory and for making said correction data to be latched in said data latch circuit, wherein said reference potential generation circuit comprises a circuit which has circuit elements for varying said reference potential and which receives said correction data from said data latch circuit for switching of said circuit elements.