Product category: PCB Connectors
News Release from: Molex UK | Subject: U320 SCSI LVD terminator
Edited by the Electronicstalk Editorial Team on 1 July 2003
SCSI terminator delivers
reliable signal integrity
To enable the user to achieve dependable connections for U320, the next generation of SCSI systems, Molex has developed the U320 SCSI LVD terminator and internal cable system
This internal connection system is designed to match impedances of the bus and helps insure bus termination in a stable environment. It is ideal for applications including networked attached storage, RAIDs, host bus adapter cards, PCI addon cards, file servers, work stations and tape storage systems.
This article was originally published on Electronicstalk on 1 July 2003 at 8.00am (UK)
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The Molex terminator supports only LVD SCSI drivers; it does not support single-ended (SE) and high-voltage differential (HVD) SCSI drivers (EIA485).
The active chips on the terminator PCB detect the type of SCSI drivers present on the bus via the voltage on the DIFFENS SCSI control line.
If they detect the presence of an SE or HVD SCSI driver, they disconnect by switching all terminator resistors off and enter a high-impedance state.
The terminators can also be commanded to disconnect the terminating resistors.
The terminator's circuitry includes 2.7 to 5.25V operation, differential failsafe bias, built-in SPI-3 mode change filter/delay, and tightly controlled impedance and capacitance for single lines.
The PCB card used in the terminator provides controlled impedance traces to maintain signal integrity.
The terminator connects to the cable via a 68-pin IDT transition connector.
Molex offers a broad range of cable assembly solutions using the terminator, from the standard three and five-drop versions to customised versions.
All cables meet SPI-4 specifications.
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