TI UCC5628FQPR/81540

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 0°C to 70°C.

• 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