DETAILED DESCRIPTION

The DS2118M Ultra3 LVD/SE SCSI terminator is both a low-voltage differential (LVD) and single-ended (SE) terminator. The multimode operation enables the designer to implement LVD in current products while allowing the end-user SE-backward compatibility with legacy devices. If the device is connected in an LVD-only bus, the DS2118M will use LVD termination. If any SE devices are connected to the bus, the DS2118M will use SE termination. This is accomplished automatically inside the part by sensing the voltage on the SCSI bus DIFFSENS line.

FEATURES

■ Fully Compliant with SCSI SPI-2, SPI-3, SPI-4, Ultra160, and Ultra320

■ Provides Multimode Low-Voltage Differential/Single-Ended (LVD/SE) Termination for Nine Signal Line Pairs

■ Autoselection of LVD or SE Termination

■ 5 Tolerance on SE and LVD Termination Resistance

■ Low Power-Down Capacitance of 3pF

■ On-Board Thermal Shutdown Circuitry

■ SCSI Bus Hot-Plug Compatible

■ Fully Supports Actively Negated SE SCSI Signals