| 摘要 |
PURPOSE:To enable the protection of an input and output mixed circuit from static electricity by connecting an input circuit and an output circuit by a high resistance and adding them between a protective diode between a leading electrode and a high potential level of a power source, and the input circuit. CONSTITUTION:An inverter circuit input circuit is composed of a P-channel MOS transistor TP1 and an N-channel MOS transistor TN1 and a diode D3 is connected between a gate input and a VDD terminal. The gate input of the inverter circuit is further connected to an open drain output of the N-channel MOS transistor as an output circuit through a high resistor R. A diode D4 is connected between the leading electrode 1 which can become an input terminal and a low potential level of a power source (GND level). When the N- channel MOS transistor TN2 operates, the function of N-channel transistor TN2 is kept in a normal operating state by restriction of current because the resistor R2 is a high resistance. |
