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DS2125 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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DS2125 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 7 page DS2125 Ultra3 LVD/SE SCSI 15-Line Terminator 5 of 7 Figure 2. SCSI Bus Configuration Note: The following terms are used throughout this data sheet: DIFFSENS: Refers to the SCSI bus signal. DIFFSENSE: Refers to the DS2125 pin name and internal circuitry capable of driving the DIFFSENS line. DIFF_CAP: Refers to the DS2125 pin name and internal circuitry relating to monitoring the DIFFSENS line. DETAILED DESCRIPTION The DS2125 combines LVD and SE termination with DIFFSENSE sourcing and detection. A bandgap reference is fed into two amplifiers, which creates a 1.25V reference voltage and a 2.85V reference voltage. The control logic determines which of these references are applied to the termination resistors. If the SCSI bus is in LVD mode, the 1.25V reference is used. If the SCSI bus is in SE mode, the 2.85V reference is used. That same control logic switches in/out parallel resistors to change the total termination resistance accordingly. Finally, in SE mode the Rp pins are switched to ground. The DIFFSENSE circuitry decodes trinary logic. There is one of three voltages on the SCSI control line called DIFFSENS. Two comparators and a NAND gate determine if the voltage is below 0.6V, above 2.15V, or in between, which indicates the mode of the bus as SE, HVD, or LVD, respectively. TERMPWR TERMPWR 4.7 mF 0.1 mF DIFFSENSE TPWR ISO VREF DIFF_CAP DIFFSENS 4.7 mF TPWR ISO VREF DIFF_CAP DIFFSENS CONTROL LINES (15) 0.1 mF TPWR ISO VREF DIFF_CAP DIFFSENS 4.7 mF 4.7 mF TPWR ISO VREF DIFF_CAP DIFFSENS CONTROL LINES (15) 20k W 20k W |
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Similar Description - DS2125 |
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