PURPOSE: To prevent the noise of an internal source from occurring while an output circuit is operated by taking the OR of the outputs of a row decoder circuit and a column decoder circuit, and controlling the output of sense amplifier by means of the output.

CONSTITUTION: Information of a memory transistor TR6 selected by an address input signal is transmitted to the sense amplifier 10 through a selected bit line 7, and the amplifier 10 discriminates memory information. A NOR 15 outputs to an address input 'L' for which an inverter 16 inverts until the row decoder circuit output 5 and the column decoder circuit output 'L', and a TR for fixing sense amplifier output 17 fixes the output of the amplifier 10 to 'L'. The rest is fixed until the output of an output circuit 11. As a result, noise does not occur in a source wiring and memory information is stably discriminated in all the amplifiers. At the same time, TR 17 becomes non-conductive, and m-piece of amplifiers 10 transmit to the circuit 11 respective memory information whose discrimination is decided.