| 摘要 |
<p>Provided is an input circuit, which corresponds to NPN open collector control, PNP open collector control and relay control, and which suppresses power consumption. Also provided is an integrated circuit having the input circuit integrated therein. In an input circuit (100) of the present invention, the anode of a diode (D1) is connected to an input terminal (IN), one end side of a resistor (R1) is connected to the cathode side of the diode (D1), one end side of a resistor (R2) is connected to the other end side of the resistor (R1), one end side of a resistor (R3) is connected to the other end side of the resistor (R2), and the other end side of the resistor (R3) is grounded. The anode of a diode (D2) is connected to the other end side of the resistor (R2), said side being the one end side of the resistor (R3), the cathode of the diode (D2) is connected to the input terminal (IN) side, the cathode of a diode (D3) is connected to the one end side of the resistor (R1), and an internal power supply terminal (V2in) is provided on the anode side of the diode (D3). A light emitting element (HD) is connected in parallel to the resistor (R1), and a light receiving element (PD) is connected to face the light emitting element (HD).</p> |
