Datasheet > AR7519

AR7519

更新时间： 2024-11-18 08:34:19

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描述
Ultra Multimode LVD/SE SCSI Terminator

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AR7519 数据手册

The wireless communication solution provider

Ultra Multimode LVD/SE

SCSI Terminator

AR7519

FEATURES

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

Auto-selectable multimode for single-ended or low voltage

differential termination.

Current limit and thermal shutdown protection.

Ground driver integrated for single-ended operation

SCSI bus hot-swap compatible.

Compatible with active negation drivers.

APPLICATIONS

PC server

Workstation

DESCRIPTION

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). In addition, the AR7519 provides backward

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 5%

differential and 226 10% common mode impedance. A fail-safe

5%. For

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.

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