DS2125
Ultra3 LVD/SE 15-Line SCSI Terminator
Industry's Most Stable LVD/SE, 15-Line SCSI Terminator
Part Details
- Fully Compliant with Ultra3 SCSI
- Provides Multimode Low-Voltage Differential/Single-Ended (LVD/SE) Termination for 15 Signal Line Pairs
- Auto-Selection of LVD or SE Termination
- 5% Tolerance on SE and LVD Termination Resistance
- Low 3pF Power-Down Capacitance
- On-Board Thermal-Shutdown Circuitry
- SCSI Bus Hot-Plug Compatible
- Fully Supports Actively Negated SE SCSI Signals
The DS2125 Ultra3 LVD/SE SCSI terminator is both a low-voltage differential (LVD) and single-ended (SE) terminator. The multimode operation enables the designer to implement LVD in current products while allowing the end user SE backward compatibility with legacy devices. If the device is connected in an LVD-only bus, the DS2125 uses LVD termination. If any SE devices are connected to the bus, the DS2125 uses SE termination, which is accomplished automatically inside the part by sensing the voltage on the SCSI bus DIFFSENS line.
For the LVD termination, the DS2125 integrates two current sources with 15 precision resistor strings. For the SE termination, one regulator and 15 precision 110Ω resistors are used. Two DS2125 terminators are needed for a wide SCSI bus.
Applications
- Network-Attached Storage (NAS)
- RAID Systems
- SCSI Cables
- SCSI Host Bus Adapter (HBA) Cards
- Servers
- Storage Area Networks (SANs)
Documentation
Data Sheet 1
Reliability Data 1
Design Note 2
This is the most up-to-date revision of the Data Sheet.
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