Kabushiki Kaisha Toshiba

Yasuyuki Kajitani

Daisuke Kato

A cell array selection circuit, a cell array bit line precharge circuit, and a sense amplifier bit line precharge circuit are provided in a semiconductor storage apparatus. In a standby state of read/write operation, the cell array selection circuit is controlled to an inactive state, and the bit line precharge circuits are controlled to an active state. In an active state of read/write operation, the cell array selection circuit to be selected is controlled to an active state, and the cell array bit line precharge circuit and the sense amplifier bit line precharge circuit are controlled to an inactive state. Cell array selection transistors, sense amplifier bit line precharge transistors, and control signals supplied to gate electrodes of the transistors are set in which change in potential provided on a cell array bit line pair when the states of the transistors change is cancelled.

Semiconductor storage apparatus

A semiconductor memory device including a memory cell array which has a plurality of memory cells arranged in a matrix form, a plurality of bit line pairs which transfer data among the memory cells, a sense amplifier bank which includes a plurality of sense amplifiers, the plurality of sense amplifiers including a plurality of sense amplifier circuits, and the plurality of sense amplifier circuits being connected respectively to the plurality of bit line pairs to amplify data transferred to the bit line pairs, a plurality of word lines connected to the memory cells, a plurality of wirings disposed respectively corresponding to the plurality of word lines and above the plurality of word lines, and a plurality of stitch portions which connect the plurality of word lines to the plurality of wirings every predetermined intervals. Two active areas in which the sense amplifier circuit is formed respectively in both sides of a stitch area corresponding to each of the stitch portions in the sense amplifier bank are connected to each other, and a dummy transistor is disposed on the connected active areas.

Semiconductor memory device

A semiconductor memory device includes a memory cell array which has a plurality of memory cells, a plurality of first bit line pairs which transfer data among the memory cells, a plurality of second bit line pairs disposed corresponding to the plurality of first bit line pairs, a plurality of variable resistance elements disposed to connect the plurality of first bit line pairs to the plurality of second bit line pairs, a plurality of data line pairs disposed corresponding to the plurality of second bit line pairs, a plurality of input/output gates which transfer data between the plurality of second bit line pairs and the plurality of data line pairs, a plurality of sense amplifier circuits which amplify data transferred to the plurality of second bit line pairs, and a bit line isolation control circuit which controls resistance values of the plurality of variable resistance elements.

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Yokohama, Japan

Yasuyuki Kajitani