Low Voltage Differential to High Voltage Differential Converter

LVD2HVD board

The LVD2HVD is a low-voltage differential (LVD) to high-voltage differential (HVD) converter. Unlike some converters, the LVD2HVD is true LVD and does not degrade to a single-ended (SE) SCSI bus.

The small format PCB is full speed Ultra Wide SCSI capable and designed for convenient integration into most common enclosures.

  • Ultra SCSI capable.
  • Initiators and Targets may be placed on either side of the device.
  • Does not consume a SCSI ID.
  • Transparent operation, Independent of host software.
  • LVD side switches to Single-ended mode automatically if plugged into a SE bus.
  • Hot-Swap mode, where each side can be electronically isolated.
  • Integral Multimode LVD terminators that sense the LVD bus and switch to SE mode as appropriate.
  • Supplies terminator power out to each bus via a jumper and restable fuse.
  • SCSI bus signals are re-generated and re-timed.
To connect:
  • HVD SCSI peripherals to an LVD or SE controller.
  • LVD SCSI peripherals to an HVD controller so that the LVD bus remains true LVD.
  • SE SCSI peripherals to an HVD controller.


Other uses:
  • Creating bus segments that are electrically isolated from each other.
  • Bus extending, where an LVD SCSI bus can be lengthened to 100m by adding converters in serial fashion.
  • Enabling Server Cluster.

Transfer Rate: 40 Mbytes/sec - Ultra SCSI

Physical Size: 50mm x 147mm

Temperature Range: 0?C to 60 ?C

Power Requirements: +5V ?5 Watts typical. Standard 3.5" miniature power connector

Connectors: Standard 68-way SCSI III female

Informative LED's Indicate:
  • Presence of termpower for each bus
  • Bus error -where a device of the wrong type is plugged into either bus
  • SCSI bus activity




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Peripheral Vision (Technology) Ltd
4 Zephyr House, Calleva Park
United Kingdom

tel: +44 (0) 1189 820432