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( File format: PDF, 387 KB )
Multimode SCSI 14 Line Terminator (Rev. C)
Texas Instruments

Description
The UCC5628 Multimode SCSI terminator provides a smooth transition into the low-voltage differential SCSI parallel interface (SPI-2, SPI-3 and SPI-4). 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 UCC5628 can not be used on a high voltage differential (HVD), EIA485, differential SCSI bus. If the UCC5628 detects a HVD SCSI device, it switches to a high-impedance state. The Multimode terminator contains all functions required to terminate and auto detect and switch modes for SPI-2, SPI-3 and SPI-4 bus architectures. Single ended, differential impedances and currents are trimmed for maximum effectiveness. Fail-safe biasing is provided to insure signal integrity. Device/bus type detection circuitry is integrated into the terminator to provide automatic switching of termination between single ended and LVD SCSI and a high impedance for HVD SCSI. The multimode function provides all the performance analog functions necessary to implement SPI-2 termination in a single monolithic device. The UCC5628 is offered in a 48-pin LQFP package for a temperature range of 0C to 70C.
Features
Auto Selection Single Ended (SE) or Low Voltage Differential (LVD) Termination Meets SCSI-1, SCSI-2, SCSI-3, SPI, Ultra (Fast-20), Ultra2 (SPI-2 LVD), Ultra3, Ultra160 (SPI-3) and Ultra320 (SPI-4) Standards 2.7V to 5.25V Operation Differential Failsafe Bias Thermal packaging for low junction temperature and better MTBF




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