General Description

The G218B Multi-mode LVD/SE SCSI terminator provides a smooth transition into the next generation of the SCSI Parallel Interface (SPI-3). It automatically senses the bus, via DIFFSENS, and switches the termination to either single- ended (SE) or low voltage differential (LVD) SCSI, dependent on which type of devices are connected to the bus. If the G218B detects a HVD SCSI device, it switches to a high impedance state. For a 16-bit Wide SCSI bus to be operational, three G218B terminators are needed.
The Multi-mode terminator contains all functions required to terminate and auto detect and switch modes for SCSI Parallel Interface (SPI) bus architectures. For the SE termination, one regulator and nine precision 110ohm resistors are used. For the LVD termination, the G218B integrates 18 regulated supplies with nine precision resistor strings.

Features

■ Auto-selectable multi-mode Single-Ended
or LVD Termination
■ Meets SCSI-1, SCSI-2, SCSI-3 SPI Ultra
(Fast-20), Ultra 2(SPI-2 LVD), Ultra160 (SPI-3
LVD) standards.
■ Supports active negation
■ 3pF channel capacitance
■ Thermal protection
■ Hot-Swap compatible
■ 5% tolerance on SE and LVD termination
resistance
■ 28 and 36 pin SSOP package
■ 28 Pin SSOP: Pin Compatible with DS2119
■ 36 Pin SSOP: Pin Compatible with DS2118,
LX5241 and UCC5630

Applications

■ Server and workstation
■ High-end PC
■ Industrial PC
■ Disk Array (RAID)
■ SCSI cable