AR7519 ETC, AR7519 Datasheet

AR7519

Manufacturer Part Number

AR7519

Description

Ultra Multimode Lvd/se SCSI Terminator

Manufacturer

ETC

Datasheet

1.AR7519.pdf (2 pages)

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Ultra Multimode LVD/SE

SCSI Terminator

DESCRIPTION

APPLICATIONS

The AR7519 multimode SCSI terminator is both a single-ended (SE) and a

low voltage differential (LVD) terminator that meets the specification of SCSI

parallel interface (SPI-3).

compatibility to the SCSI-1, SCSI-2, and SE specifications. The multimode

terminator contains all functions required to terminate and auto detect for

SCSI devices without hardware fluctuation. Auto-selection is achieved by

using voltage detection on the DIFFSENSE signal. The AR7519 senses the

DIFFSENSE line while sourcing the DIFFSENSE signal with the LVD levels.

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

the LVD termination, the AR7519 integrates two current sources with

nine precision resistor strings. This architecture yields a 105

differential and 226

bias of 110 mV is sustained when no drivers are connected to the SCSI

bus. If the AR7519 detects a HVD SCSI device on the bus, all the

signals will be set to a high impedance state.

FEATURES

„Y Meets SCSI-1, SCSI-2, Ultra2, and Ultra3/Ultra160 standards.

„Y Auto-selectable multimode for single-ended or low voltage

„Y Current limit and thermal shutdown protection.

„Y SCSI bus hot-swap compatible.

„Y Compatible with active negation drivers.

PC server

Workstation

differential termination.

Ground driver integrated for single-ended operation

10% common mode impedance. A fail-safe

In addition, the AR7519 provides backward

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AR7519

5%. For

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