LX5240

TermPwr Voltage .................................................................................................+7V
Operating Junction Temperature
Plastic (DB, PW Packages) .......................................................................... 150°C
Storage Temperature Range .............................................................. -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) .................................................... 300°C

The LX5240 is a multimode SCSI terminator with plug-and-play capability that conforms to the SCSI Parallel Interconnect-2 (SPI-2) specification developed by the T10 standards committee for low voltage differential (LVD) termination, while providing backwards compatibility to the SCSI, SCSI-2, and SPI single-ended specifications. Multimode compatibility permits the use of legacy devices on the bus without hardware alterations. Automatic mode selection is achieved through voltage detection on the diffsense line.

The LX5240 utilizes Linfinity's UltraMAX technology which delivers the ultimate in SCSI bus performance while saving component cost and board area. Elimination of the external capacitors also mitigates the need for a lengthy capacitor selection process. The individual high bandwidth drivers also maximize channel separation and reduce channel to channel noise and cross talk. The high bandwidth architecture insures ULTRA2 performance while providing a clear migration path to ULTRA3 and beyond.

When the LX5240 is enabled, the differential sense (DIFFSENSE) pin supplies a voltage between is tied to the DIFFSENSE input of the corresponding LVD transceivers. This action enables the LVD transceiver function. DIFFSENSE capable of supplying a maximum of 15mA. Tying the DIFFSENSE pin high places the LX 5240 in a HI Z state indicating the presence of an HVD device.

Tying the pin low places the part in a single-ended mode while also signaling the multimode transceiver to operate in a single-ended mode. The LX5240 supports full Plug and Play functionality with the DISCONNECT A and pins. These logic compatible pins place the device in operational or sleep modes. During sleep mode, power dissipation is reduced a meager 15µA while also placing all outputs in a HI Z state.

Also during sleep mode, the DIFFSENSE function is disabled and is placed in a HI Z state. Another key feature of the LX5240 is the master / slave function. Driving this pin high or floating the pin enables the 1.3V DIFFSENSE reference. Driving the pin low disables the on board DIFFSENSE reference and enables use of an external master reference device.