Patent ID: 7426147

Claim:
A power supply voltage control circuit supplying a power supply voltage to a memory cell array, including a plurality of word lines extending along row direction, a plurality of bit lines extending along column direction, a plurality of plate lines extending along the row direction, and a plurality of unit cells disposed at intersections of a plurality of word lines and a plurality of bit lines, comprising: a word line control circuit for supplying a first voltage to the word lines; and a plate line control circuit for supplying a second voltage to the plate lines; wherein the power supply voltage control circuit provides an amount of current flow from the first voltage so as to keep the first voltage potential almost constant during increasing a value of the second voltage in a power-on sequence in which firstly increases a value of the higher first voltage of two potential voltages: the first voltage and the second voltage capacitive coupled, and then increases a value of the lower second voltage.