Patent ID: 8014198
Filing Date: 2011-09-06
Classification: G11C,H01L

Abstract:
1. A nonvolatile semiconductor memory device comprising: a memory cell array of a plurality of memory cells arranged in a matrix, which each include a selecting transistor, and a memory cell transistor connected to the selecting transistor; a plurality of bit lines each commonly connecting drains of a plurality of the selecting transistors present in one and the same column; a plurality of first word lines each commonly connecting gate electrodes of a plurality of the memory cell transistors present in one and the same row; a plurality of second word lines each commonly connecting select gates of a plurality of the selecting transistors present in one and the same row; a plurality of source lines each commonly connecting sources of a plurality of the memory cell transistors present in one and the same row; a column decoder connected to said plurality of bit lines and controlling a potential of said plurality of bit lines; a voltage application circuit connected to said plurality of first word lines and controlling a potential of said plurality of first word lines; a first row decoder connected to said plurality of second word lines and controlling a potential of said plurality of second word lines; and a second row decoder connected to said plurality of source lines and controlling a potential of said plurality of source lines, the column decoder being formed of a circuit whose withstand voltage is lower than a withstand voltage of the voltage application circuit and a withstand voltage of the second row decoder, and the first row decoder being formed of a circuit whose withstand voltage is lower than the withstand voltage of the voltage application circuit and the withstand voltage of the second row decoder, wherein information is written into a selected one of the memory cells by applying a first voltage which gradually rises selectively to one of the first word lines by the voltage application circuit; and applying a second voltage to one of the source lines by the second row decoder.