FEATURES
AR7519 „Y Meets SCSI-1, SCSI-2, Ultra2, and Ultra3/Ultra160 standards. „Y Auto-selectable multimode for single-ended or low voltage differential termination. „Y Current limit and thermal shutdown protection. Ground driver integrated for single-ended operation „Y SCSI bus hot-swap compatible. „Y Compatible with active negation drivers. APPLICATIONS
PC server Workstation DESCRIPTION
In addition, the AR7519 provides backward compatibility to the SCSI-1, SCSI-2, and SE specifications. Auto-selection is achieved by using voltage detection on the DIFFSENSE signal. The DIFFSENSE line being grounded indicates that one or more SE devices are attached on the bus. The AR7519 switches to the termination mode that is appropriate for the bus based on the value of the DIFFSENSE input voltage. For the SE termination, the active terminator will pull RXN to 2.85V and RXP to hard ground. The AR7519 can sink 22 mA per line as required by SCSI specification. The SE resistor will maintain 110 5%. For the LVD termination, the AR7519 integrates two current sources with nine precision resistor strings.
