| 摘要 |
PURPOSE: A dynamic random access memory device providing a refresh period selecting circuit is provided to select one among several refresh periods. Also, a dynamic random access memory device providing an input/output bit width selecting circuit is provided to select one among bit widths of a data inputted/outputted to/from a memory device. Also, a dynamic random access memory device is provided to easy change a selected refresh period or an input/output bit width. CONSTITUTION: A dynamic random access memory device includes of a plurality of memory cell arrays(110), a refresh period selecting circuit(150), an address generating circuit, and a row selecting circuit. The plurality of memory cell arrays is arranged by the column and the row. The refresh period selecting circuit responds to a control signal of the outside and generates a refresh period selecting signal. The address generating circuit generates a row address during a refresh period corresponding to the refresh period selecting signal. The row selecting circuit responds to the row address and sequentially selects the rows.
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