| 摘要 |
PURPOSE: To suppress deterioration of a word line in the case where a supply voltage is high or at the time of a BT test, and thereby to ensure reliability, by boosting the voltage of the word line within the supply voltage when the supply voltage is a prescribed value or below, and by outputting the supply voltage when it exceeds the prescribed value. CONSTITUTION: A supply voltage detecting circuit 101, a boosting circuit 102 and a power supply selecting circuit 103 are provided and the boosting circuit 102 is controlled by a detection signal ϕ1 of the supply voltage detecting circuit 101. In the case where a supply voltage value exceeds a prescribed value, this supply voltage value is outputted, and when the supply voltage value is the prescribed value or below, a boosted voltage is outputted. |
