The UCC5639 Multimode SCSI Terminator provides a smooth transition into the next generation of the SCSI Parallel Interface (SPI-2). It automatically senses the bus, via DIFFB, and switches the termination to either single ended (SE) or low voltage differential (LVD) SCSI, dependent on which type of devices are connected to the bus. The UCC5639 can not be used on a HVD, EIA485, differential SCSI bus. If the UCC5639 detects a HVD SCSI device, it switches to a high impedance state.