| 摘要 |
a pull-up transistor driving unit(11) which inputs the inversion signal of a data output buffer enable signal and the inversion signal of a read data signal, and drives to make the output of a pull-up transistor constant in regardless of the change of power voltage with the current driving power controlled by the signal inputted from a write enable pad(/WE); and a first pull-down transistor driving unit(12) which inputs the data output buffer enable signal and the read data signal, and makes the output of a first pull-down transistor constant in regardless of the change of power voltage.
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