Patent ID: 6556479
Filing Date: 2003-04-29
Classification: G11C

Abstract:
A nonvolatile semiconductor memory device, comprising:a memory array including a plurality of memory cells wherein predetermined voltages are applied to selected memory cells to change threshold voltages thereof, thereby storing data therein according to the difference between the threshold voltages, wherein some memory cells in the memory array are used as spare memory cells, wherein said nonvolatile semiconductor memory device includes a latch circuit connected to each bit line of the memory array through a transmission switch, the memory array is capable of storing therein substitutional information for replacing a defective bit by a spare memory cell, and the substitutional information is capable of being transferred from the memory array to the latch circuit through the transmission switch and held in the latch circuit, and wherein a plurality of memory cells are respectively connected to respective bit lines in a set value storage area which stores the substitutional information, the same data is stored in a plurality of memory cells connected to the same bit line in the set value storage area, and the latch circuit holds data, based on signals read from the plurality of memory cells having the same data stored therein.