| 摘要 |
PURPOSE:To make it possible to mixedly mount a circuit which is strong in electrostatic breakdown and weak in noise and a circuit which is liable to generate noise, by connecting, via a resistance element, different pins for supplying a first electric potential to a first and a second circuits. CONSTITUTION:Noise generated from a circuit 23 travels to a circuit 22 via a resistance element 31. The power supply of a first circuit 22 and the ground are generally provided with a capacitor of several hundreds pF or more. The noise is attenutated by the effect of RC delay due to said capacitor and the resistance element. When a high voltage caused by static electricity is applied across the signal pad 24 of the circuit 22 and a power supply pad 29 of the circuit 23 or the ground pad 30, electric charge is discharged to the power supply pad 29 or the ground pad 30 through an input protecting circuit in the circuit 22 and the resistor 31. As a result, a high voltage is not applied to transistors in the circuit 23, so that these transistors are protected from electrostatic breakdown. |
