Small computer system interface bus driving circuit with unique enable circuitry

摘要

An improved SCSI bus driving circuit is capable of speedily transmitting a data irrespective of the length of a small computer system interface bus cable or the number of targets connected to a host computer. The circuit includes an output buffer for buffering the output signal of a data output terminal of a host computer; and an enabling circuit for detecting the output signal of the output buffer using a logic threshold voltage of a logic gate and logically combining the signal detected and the output signal of a mode selection terminal outputted from the host computer.