Being the output circuit and comparator null output circuit which

摘要

PROBLEM TO BE SOLVED: To surely fix an output voltage to a low level or a high level when a power supply voltage drops below the lower limit voltage of a circuit by applying a divided power supply voltage to the gate of a 2nd transistor and cutting off the 2nd transistor when the power supply voltage is smaller than prescribed due to this. SOLUTION: An input voltage VIN is respectively inputted to the gates of P and N channel transistors Q1 and Q2 being a complementary pair, and inverted outputs from the drains of the Q1 and Q2 are combined to obtain a voltage VOUT to be applied. A depression transistor Q3 is connected to the output. The drain of a P channel transistor Q11 is further connected to the source of the Q1, and the source of the Q11 is connected to a power supply voltage VDD of a high potential side. On the other hand, the source of the Q2 is connected to a power supply voltage VSS of a low potential side. A voltage dividing means of a power supply voltage consisting of resistor R11 and R12 is connected to the gate of the Q11.