| 摘要 |
PURPOSE: An address decoder for selecting a sub-block and a refresh operating method of an SDRAM(Synchronous Dynamic Random Access Memory) using the address decoder are provided to reduce the peak current in the refresh operation by enabling sequentially a word line signal, a bit line sense amplifying signal, and an enable signal. CONSTITUTION: A buffering unit(31) receives a first sub-block selection address to buffer and output it. An inversion unit receives an external refresh signal to invert and output it. A first transmit gate(33) receives the external refresh signal, the output signal from the inversion unit, and a second sub-block selection address to output them. A delay unit delays the second sub-block selection address to output it. A second transmit gate(35) receives the second sub-block selection address delayed in the delay unit, the refresh signal, and the output signal from the inversion unit to output them.
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