INPUT CIRCUIT, OUTPUT CIRCUIT, INPUT-OUTPUT CIRCUIT AND SIGNAL TRANSMISSION SYSTEM PROVIDED WITH THE INPUT- OUTPUT CIRCUIT

摘要

PROBLEM TO BE SOLVED: To utilize a control signal that set the output end to high impedance to enable power-saving and also to output an expected signal from an input circuit by stopping a current source feeding power to the input circuit based on such a matter that a signal is no longer supplied when the generating an input operation is not supplied any more.;SOLUTION: In an basic operation of an input-output circuit, when a high level enable signal is supplied and an output circuit 12A operates, an input circuit 14A does not consume power, and conversely, when a low level enable signal is supplied and the input circuit 14A operates, the output circuit 12A does not consume power. In addition to this, when the high level enable signal is supplied and the input circuit 14A does not operate, a signal of value expected in a CMOS internal circuit connected to an output end from the output end is supplied to the CMOS internal circuit from the input circuit 14A.;COPYRIGHT: (C)2000,JPO