Patent ID: 6088265
Filing Date: 2000-07-11
Classification: G11C

Abstract:
A virtual ground type semiconductor storage device including a plurality of non-volatile memory cells arranged in a matrix form and bit lines and word lines connected to the non-volatile memory cells, comprising:a power source for electrically charging the bit lies;first switching means for effecting connection and disconnection between each bit line and the power source;ground wiring which is grounded;second switching means connected between each bit line and the ground wiring;a plurality of groups of k consecutive bit lines (k: integer; k.gtoreq.3) among the bit lines; andmeans for controlling the second switching means to effect connection and disconnection between the ground wiring and at least one bit line of each group of k consecutive bit lines, wherein a number of the at least one bit line is not larger than k-2, and when the number of the at least one bit line is two or more, then these bit lines are consecutive bit lines.