| 摘要 |
<p>PURPOSE:To prevent electrostatic noise and to ensure the operation, by connecting a capacitor and a resistor between one end of a power supply and an output terminal of a boosting circuit in series and connecting a connecting terminal of the capacitor and resistor to an input of an inverter. CONSTITUTION:When a switch 9 is turned on and the circuit is at a steady- state, an inverting potential difference Vss2-Vss between a connecting terminal A and an inverter 3 is large, then a power-on clear circuit is hardly operative. Since a boosting capacitor 8 is connected in parallel with a series circuit between a capacitor 1 and a resistor 2, electrostatic noise is absorbed in the capacitor 8 and the power-on clear circuit is hardly operative due to electrostatic noise. At the application of power supply, after an oscillation circuit 11 and a frequency division circuit 10 are operated, the time required for a boosting terminal B to reach a potential level Vss2 is sufficiently slower than the time required for the inverter 3 to become in a normal operating state, the power-on clear circuit is surely operated.</p> |
