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UCC5628FQPTR Datasheet(PDF) 1 Page - Texas Instruments |
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UCC5628FQPTR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 5 page UCC5628 DESCRIPTION The UCC5628 Multimode SCSI Terminator provides a smooth transition into the next generation of the SCSI Parallel Interface (SPI-2). It automati- cally senses the bus, via DIFFB, and switches the termination to either sin- gle 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 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 bus architectures. Single Ended and Differential impedances and currents are trimmed for maximum effec- tiveness. 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 per- formance 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. Multimode SCSI 14 Line Terminator 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) and Ultra3 Standards • 2.7V to 5.25V Operation • Differential Failsafe Bias • Thermal packaging for low junction temperature and better MTBF. SLUS302A - SEPTEMBER 1999 REF 1.25V 36 DISCNCT REG L1+ L14– L14+ SOURCE/SINK REGULATOR REF 1.3V 4.7 µF . 35 DIFFSEN –15mA ≤I SOURCE ≤–5mA 50 µA ≤I SINK ≤200µA HPD SE 34 DIFFB 0.6V 2.15V 52.5 2 52.5 1 110 10 REF 2.7V SE GND SWITCH 3 TRMPWR 25 GND 4-9 HS/GND 28-33 HS/GND L1– 124 52.5 12 52.5 11 110 124 10 µA 1.3V (NOISE LOAD) MODE SE LVD DISCNCT ALL SWITCHES UP DOWN OPEN SE GND SWITCH 56mV –+ +– –+ 56mV 56mV 56mV +– 27 26 LVD BLOCK DIAGRAM UDG-98099 |
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