SS7519 Overview
Description
The SS7519 multimode SCSI terminator is both a single-ended and a low voltage differential terminator that meets the specifications of SCSI Parallel Interface (SPI-4). The SS7519 also provides backward compatibility to the SCSI-1, SCSI-2 and Single-Ended specifications.
Key Features
- !" Meets SCSI-1, SCSI-2, Ultra3 and Ultra320 Standards
- !" Auto-selectable Multimode single-ended or Low Voltage Differential termination
- !" Current limit and thermal shutdown protection
- !" Ground driver integrated for single-ended operation !" Compatible with active-negation drivers
- Single-Ended resistor will maintain 110Ω ± 5 %
- For LVD termination, the SS7519 integrates two current sources with nine accuracy resistor strings
- This architecture yields a 105Ω ±5% differential and 226Ω ±10% common mode impedance
- A fail-safe bias of 110mV is sustained when no drivers are connected to the SCSI bus
- If the SS7519 detects a HVD SCSI device on the bus, all the signals will be set to a high impedance state
