SEMICONDUCTOR NON-VOLATILE MEMORY DEVICE HAVING A NAND CELL STRUCTURE

摘要

A NAND stack array (95') is placed within a well formed on a semiconductor substrate and includes a series array of memory cell transistors (10) whose threshold voltages can be electrically altered over a range of depletion values. When a cell within a certain NAND stack is selected for a read operation, a peripheral circuit drives the selected gate word line to the well potential and drives the word lines of the other gates within the selected NAND stack to a potential at least equal in magnitude to the magnitude of a reference voltage plus the threshold voltage of a memory cell in the programmed state.