Dallas DS2120E/T&R/C08

Overview

The DS2120E/T&R/C08 Ultra3 LVD SCSI terminator is a low-voltage differential (LVD) terminator. If the device is connected in an LVD-only bus, the DS2120E/T&R/C08 uses LVD termination. If any single-ended (SE) or high-voltage differential (HVD) devices are connected to the bus, the DS2120E/T&R/C08 disconnects from the bus. This is accomplished inside the part automatically by sensing the voltage on the SCSI bus DIFFSENS line.For the LVD termination, the DS2120E/T&R/C08 integrates two current sources with nine precision resistor strings. Three DS2120E/T&R/C08 terminators are needed for a wide SCSI bus.

■ Fully compliant with Ultra3, Ultra160, Ultra320, and Ultra2 (LVD only) SCSI■ Provides low-voltage differential (LVD) termination for nine signal line pairs■ Zero-temperature coefficient-termination resistors■ Auto-select of LVD termination■ 5% tolerance on LVD termination resistance■ Low power-down capacitance of 3pF■ Built-in mode change filter/delay■ On-board thermal-shutdown circuitry■ SCSI bus hot-plug compatible

Features