| 摘要 |
A semiconductor memory device is provided to assure the reliability of pullup operation of a sense amplifier by preventing the variation of a normal drive voltage level due to over-driving. A driver(20) outputs a drive signal, and over-drives the drive signal with an over drive voltage higher than a normal drive voltage, and normal-drives the drive signal with the normal drive voltage. A drive voltage control part(30) compensates the normal drive voltage variation due to the previous over-driving during the normal driving by detecting the level of the over drive voltage. The drive voltage control part controls the normal drive voltage to have a target level, by controlling discharge of the normal drive voltage in correspondence to the detection result of the over drive voltage during the normal driving period.
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