| 摘要 |
PURPOSE:To decrease noise of an input signal by employing an output drive circuit of an input output drive circuit whose control signal and an internal output signal are fixed to +VDD or -VSS for an input drive circuit. CONSTITUTION:An output control terminal 104 and an internal output terminal 103 of an output drive circuit 2 of an input output drive circuit comprising an input drive circuit 1 and an output drive circuit 2 are fixed to +VDD or -VSS. With an input of large level noise given to the input terminal 10, since the output control terminal 104 and the internal output terminal 103 of the output drive circuit 2 are fixed to the level +VDD, a P-channel MOSFET 17 and an N-channel MOSFET 18 are turned off to constitute a diode. Thus, the diode acts like a protection diode, much noise can be absorbed. Then the internal signal with less noise can be produced. |
