| 摘要 |
PURPOSE:To obtain a semiconductor integrated circuit operated stably against electric disturbance such as power supply fluctuation, electromagnetic induction or the like by transmitting and receiving a logical signal from an external device in terms of a difference voltage of a couple of complementary electric signals. CONSTITUTION:The right side from a boundary line X-X' is a circuit diagram of the inside of a semiconductor integrated circuit representing a logical signal input section of an example of the execution, and the left side is the external part. Two electric signals Vin, V'in are used as an input signal. In both diagrams, a voltage difference of the input signals Vin-V'in>0V corresponds to ''1'' and Vin-V'in<0V corresponds to a logical signal ''O''. For example, the voltage difference V=Vin-V' in is amplified by a differential amplifier 1 or push-pull amplifiers 3-6 and logical signals Vs, V's in pairs are obtained at the inside of the integrated circuit. |
