LX5218

Continuous Termination Voltage .......................................................................... 10V
Continuous Output Voltage Range .............................................................. 0 to 5.5V
Continuous Disable Voltage Range ............................................................. 0 to 5.5V
Operating Junction Temperature ........................................................... 0°C to 125°C
Storage Temperature Range ............................................................. -65°C to +150°C
Solder Temperature (Soldering, 10 seconds) ................................................... 300°C

The LX5218 SCSI terminator is part of Linfinity's UltraMAX family of high-performance, adaptive, nonlinear mode SCSI products, which are designed to deliver true UltraSCSI performance in SCSI applications. The low voltage BiCMOS architecture employed in their design offers superior performance to older linear passive and active techniques. Linfinity's UltraMAX architecture employs high-speed adaptive elements for each channel, thereby providing the fastest response possible - typically 35MHz, which is 100 times faster than the older linear regulator/ terminator approach used by other manufacturers.

Products LX5218 using this older linear regulator approach have bandwidths which are dominated by the output capacitor and which are limited to 500KHz (see further discussion in the Functional Description section). The UltraMAX architecture also eliminates the output compensation capacitor typical in earlier terminator designs. It is approved for use with SCSI- 1, -2, -3, UltraSCSI and beyond - providing the highest performance alternative available today.

Another key improvement offered by the LX5218 lies in its ability to insure reliable, error free communications even in systems which do not adhere to recommended SCSI hardware design guidelines, such as the use of improper cable lengths and impedances. Frequently, this situation is not controlled by the peripheral or host designer and, when problems occur, they are the first to be made aware of the problem. The LX5218 architecture is much more tolerant of marginal system integrations. The LX5218 has two disconnect pins for SCSI Plug and Play (PnP) applications.

Quiescent current is typically less than (275µA) in disable mode, while the output capacitance is also less than 3pF. The obvious advantage of extended battery life for portable systems is inherent in the product's sleepmode feature. Additionally, the disable function permits factory-floor or production-line configurability, reducing inventory and product-line diversity costs. Field configurability can also be accomplished without physically removing components which, often times results in field returns due to mishandling. Reduced component counts is also inherent in the LX5218 architecture.

Traditional termination techniques require large stabilization and transient protection capacitors of up to 20µF in value and size. The LX5218 architecture does not require these components, allowing all the cost savings associated with inventory, board space, assembly, reliability, and component costs.