Patent ID: 6459396
Filing Date: 2002-10-01
Classification: H03K,H03M

Abstract:
An electric current switch circuit which switches ON or OFF an electric current in response to an output of an IIL logic circuit, comprising:a first transistor of NPN type, that has a base connected with an output terminal of the IIL logic circuit and a collector that is an output terminal through which the electric current flows, for switching ON or OFF the electric current; a first resistor through which an emitter of the first transistor is grounded; a first constant current source for supplying the base of the first transistor with a bias electric current; a second transistor of PNP type, that has an emitter connected with the base of the first transistor and a collector that is grounded, for controlling a voltage of the output terminal of the IIL logic circuit; and a voltage bias circuit for supplying the base of the second transistor with a bias voltage.