| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reliably initialize an internal node of a semiconductor device when a supply voltage is decreased. <P>SOLUTION: A first transistor has one end and a gate connected to a first power supply line provided with a supply voltage, and the other end connected to a first node. A second transistor has a gate connected to a second node, one end connected to the first node and the other end connected to a third node. A third transistor has one end connected to a second power supply line and a gate connected to a fourth node, and the other end connected to the third node. A first bias voltage production circuit supplies a first bias voltage to the second node. A second bias voltage production circuit supplies a second bias voltage to the fourth node. In this way, a supply voltage when the third node changes in voltage from a certain level to a different level can be set greater, and when the supply voltage is reduced, the internal node of a semiconductor device can be reliably initialized in accordance with change of a voltage on the third node. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
