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UCC5630AFQPTR Datasheet(PDF) 5 Page - Texas Instruments |
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UCC5630AFQPTR Datasheet(HTML) 5 Page - Texas Instruments |
5 / 8 page 5 UCC5630A REG TERMPWR DISCNCT TERMPWR DIFFB REG DIFF B TERMPWR TERMPWR 4.7 µF . 4.7 µF . 4.7 µF . 4.7 µF 4.7 µF . 36 17 20 1 21 20 21 1 CONTROL LINES 36 DISCNCT 17 CONTROL LINES DIFSENS DIFSENS REG TERMPWR DISCNCT DIFF B 4.7 µF . 36 17 1 21 DATA LINES (9) REG TERMPWR DIFFB 4.7 µF . 36 19 1 21 DATA LINES (9) TERMPWR REG DIFFB 4.7 µF 21 1 DATA LINES (9) 36 DISCNCT 17 TERMPWR REG DIFFB 4.7 µF 21 1 DATA LINES (9) 36 DISCNCT 17 4.7 µF . MSTR/SLV 19 19 MSTR/SLV 19 MSTR/SLV 19 MSTR/SLV MSTR/SLV 19 DISCNCT 17 MSTR/SLV 50k 50k 20 20 20 20 NC NC NC NC APPLICATION INFORMATION Figure 2. Application diagram. UDG-98193 All SCSI buses require a termination network at each end to function properly. Specific termination require- ments differ, depending on which types of SCSI devices are present on the bus. The UCC5630A is used in multi-mode active termination applications, where single ended (SE) and low voltage differential (LVD) devices might coexist. The UCC5630A has both SE and LVD termination networks integrated into a single monolithic component. The correct termina- tion network is automatically determined by the SCSI bus "DIFSENS" signal. The SCSI bus DIFSENS signal line is used to identify which types of SCSI devices are present on the bus. On power-up, the UCC5630A DIFSENS drivers will try to de- liver 1.3V to the DIFSENS line. If only LVD devices are present, the DIFSENS line will be successfully driven to 1.3V and the terminators will configure for LVD operation. If any single ended devices are present, they will present a short to ground on the DIFSENS line, signaling the UCC5630A(s) to configure into the SE mode, accommo- dating the SE devices. Or, if any high voltage differential (HVD) devices are present, the DIFSENS line is pulled high and the terminator will enter a high impedance state, effectively disconnecting from the bus. |
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