| 摘要 |
PURPOSE:To reduce the error rate to alpha rays, by changing a substrate potential according to the internal timing. CONSTITUTION:A substrate voltage VBB in the time 7 when the information read out on a bit line and a sense amplifier is inverted with the radiation of alpha rays, is made smaller for the absolute value than the substrate voltage in other time. Further, the absolute value of the substrate voltage VBB where the potential difference between bit lines from the end of precharge equalizing of the bit line to the end of sense amplifier operation is made greater than the voltage of the bit line in variation with alpha rays, is made smaller than thet of the substrate voltage in other time. |
