DS2120 is a SCSI bus terminator produced by Maxim Semiconductor. It supports Ultra3, Ultra160, Ultra320, Ultra2 SCSI standards, and LVD protocol. It supports automatic selection of LVD termination, zero temperature coefficient termination resistors, low power-down capacitance, built-in mode change filter/delay, and on-board thermal shutdown circuitry.
The DS2120 is a low-voltage differential (LVD) terminator designed for Ultra3, Ultra160, Ultra320, and Ultra2 (LVD only) SCSI buses. It provides termination for nine signal line pairs using zero-temperature coefficient resistors with 5% tolerance. The device features auto-selection of LVD termination and low power-down capacitance.
| Termination Resistance (Differential) | 105 Ohm |
|---|---|
| Termination Resistance (Common Mode) | 150 Ohm |
| Output Capacitance | 3 pF |
| Operating Temperature Range | 0°C to +70°C |
| Termpower Voltage (LVD Mode) | 2.7V to 5.5V |
| Thermal Shutdown Temperature | 150°C |
The device is fully compliant with Ultra3, Ultral60, Ultra320, and Ultra2 (LVD only) SCSI.
Three DS2120 terminators are required to terminate a wide SCSI bus.
The device automatically disconnects from the bus by sensing voltage on the DIFFSENS line.