Patent ID: 6492850
Filing Date: 2002-12-10
Classification: G05F

Abstract:
A semiconductor integrated circuit comprising:a voltage generator for generating an internal supply voltage supplied to internal circuits based on a reference voltage by using an external supply voltage; a first power-on circuit for generating a first power-on reset signal and for inactivating the first power-on reset signal which resets at least one of said internal circuits when said internal supply voltage exceeds a first predetermined value; a second power-on circuit for generating a second power-on reset signal and for inactivating the second power-on reset signal which resets at least one of said internal circuits, when said external supply voltage exceeds a second predetermined value; and a logic circuit for generating a third power-on reset signal and for inactivating the third power-on reset signal when both said first power-on reset signal and said second power-on reset signal are inactivated, and wherein said voltage generator supplies said external supply voltage as said internal supply voltage when said third power-on reset signal is activated.