Texas Instruments UCC5638
The UCC5638 Multimode SCSI Terminator provides a smooth transition into the LVD SCSI Parallel Interface (SPI-2, SPI-3, 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 UCC5638 can not be used on a HVD, EIA485, differential SCSI bus.| Part No. | UCC5638 |
|---|---|
| Datasheet | UCC5638 Download |
| Manufacturer |  Texas Instruments |
| Description | Multimode SCSI 15 Line Terminator |
| Buy | Stock & Price |
FEATURES
● Auto Selection Single Ended (SE) or Low Voltage Differential (LVD) Termination● Meets SCSI-1, SCSI-2, Ultra2 (SPI-2 LVD SCSI), 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. BLOCK DIAGRAM
DESCRIPTION
If the UCC5638 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 and 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.
