Patent ID: 8254193

Claim:
A semiconductor memory device comprising: a plurality of memory cells that are disposed in a matrix form, and from which data is read-out by bit lines that are provided per column of the matrix form; a selection signal outputting section that outputs a selection signal to any one bit line selection line among bit line selection lines that are provided per bit line respectively, and outputs non-selection signals to other bit line selection lines; a first precharging section that precharges a potential of a data line that outputs, to an exterior, a signal of a level corresponding to data stored in the memory cell; and a bit line selecting section that has, per bit line, a bit line selecting section that comprises (1) a second precharging section that is provided between the bit line and the data line and to which the bit line selection line is connected, and when the selection signal is inputted, the second precharging section makes the bit line and the data line be conductive and precharges a potential of the bit line by the potential of the data line that was precharged by the first precharging section, and when the non-selection signal is inputted, the second precharging section does not make the bit line and the data line be conductive, (2) a potential lowering section that is connected to the bit line and the bit line selection line, and when the non-selection signal is inputted, the potential lowering section makes the potential of the bit line be lower than the potential of the data line that was precharged by the first precharging section, and (3) a third precharging section that is connected to the bit line selection line and the bit line between the second precharging section and a connection point at which the potential lowering section is connected to the bit line, and when the non-selection signal is inputted, the third precharging section precharges the bit line between the second precharging section and the connection point at which the potential lowering section is connected to the bit line.