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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 399

Active termination for SCSI-2 bus

Sean Gold

Abstract

An active termination design for the SCSI-2 bus is described.

Keywords

SCSI-2 bus

active termination

LT1117 low dropout regulator

Overview of SCSI-2

The SCSI-2 bus1 is an interface for computers and instrumentation that communicate over small distances—often within the same cabinet. Like GPIB (IEEE 488), SCSI’s hardware and software specifications are designed to coordinate independent resources such as disk and tape drives, file servers, printers, and other computers. SCSI-2 is a bidirectional bus, which must be terminated at both ends to 2.85V (Figure 399.1). The terminators are needed because SCSI-2 uses simple open collector output drivers in its transceivers. Terminators ...

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