HAZARD COUNTERMEASURE CIRCUIT, OUTPUT CIRCUIT AND SEMICONDUCTOR DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a hazard countermeasure circuit suppressing an increase in power consumption during normal operation by stabilizing an output of a circuit when the power is supplied or shut off, and to provide an output circuit and a semiconductor device. SOLUTION: The first power and the second power which are started before and/or after the first power are supplied to the hazard countermeasure circuit. The hazard countermeasure circuit is provided with an inverter which uses the first power for a power supply voltage and an N channel MOS transistor in which an output of the inverter is connected to a gate. The N channel MOS transistor connects an output terminal of an output circuit with a reference terminal. This prevents hazard appearing in an output circuit of a circuit when the power is supplied or/and shut off. The power consumption of the circuit is not increased during normal operation. COPYRIGHT: (C)2009,JPO&INPIT