LX5121

TermPwr Voltage .....................................................................................................7V
Continuous Output Voltage Range .............................................................. 0 to 5.5V
Continuous Disable Voltage Range .............................................................. 0 to 5.5V
Operating Junction Temperature
Plastic (DB Packages) .................................................................................... 150ºC
Storage Temperature Range ............................................................. -65°C to +150°C
Solder Temperature (Soldering, 10 seconds) ................................................... 300°C

The LX5121 Plug and Play UltraMAXTM terminator represents next-generation technology for SCSI termination applications. The lowvoltage BiCMOS architecture employed in its design offers superior performance to older passive and active techniques.

Linfinity's architecture employs high-s adaptive elements for each channel, providing the fastest response possible. The channel bandwidth is typically 35MHz. The LX5121 compares favorably to older linear regulator approaches whose bandwidth's are dominated by the output compensation capacitor and are limited to the 500KHz bandwidth region (see further discussion in the Functional Description section). Linfinity's architecture also eliminates the output compensation capacitor typical in earlier terminator designs. Each is approved for use with SCSI-1,-2,-3, ULTRA and beyond - providing the highest performance alternative available today.

Another key improvement of LX5121 products lies in their ability to ensure reliable, errorfree communications even in systems which do not necessarily 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 these problems. The LX5121 architecture is much more tolerant of marginal system integrations. 

Recognizing the needs of portable and configurable peripherals, the LX5121 has a TTL compatible sleep/disable mode. Typically, quiescent current is less than 150µA in this mode. Reduced component count is also inherent in the LX5121 architecture. Traditional termination techniques require large stabilization and transient protection capacitors of up to 20µF in value and size. The LX 5121 architecture does not require these components, allowing all the cost savings associated with inventory, board space, assembly, reliability, and component costs.
The LX5121 has multiple disables for full Plug and Play SCSI capability for Host Bus Adapters with 3 SCSI connectors. It also splits the upper 9 termination lines for mixing 16- bit (wide) and 8-bit (narrow) buses with minimal board trace capacitance.