Patent ID: 6421285
Filing Date: 2002-07-16
Classification: G11C

Abstract:
A semiconductor storage device, comprising:a redundancy unit that replaces a memory cell with a redundancy memory cell according to redundancy information, if the memory cell has a defect; a plurality of charge storage devices that are programmed to have the redundancy information, each charge storage device having a fixed capacity; a redundancy-information recording unit programming said plurality of charge storage devices to set the redundancy information in said plurality of charge storage devices, by performing dielectric breakdown to said plurality of charge storage devices selectively; a charge supplying unit supplying a fixed charge to said plurality of charge storage devices; and a redundancy control unit that maintains the redundancy information in said plurality of charge storage devices supplied with the fixed charge by refreshing said plurality of charge storage devices, and supplies said redundancy information from said plurality of charge storage devices to said redundancy unit.