LSI53C140-160QFP

The LSI53C140-160QFP is one member of the LSI53C140 series.The LSI53C140 is an Ultra2 SCSI bus expander from LSI Logic.Based upon the LSI53C120 and LSI53C141 bus expanders, it incorporates all of the features found in these popular devices plus support for Ultra2 (LVD to LVD) SCSI transfer rates.  Unlike some solutions, SCSI bus expanders from LSI Logic automatically self-calibrate to adjust for periodic variations in voltage, temperature and silicon process.The signals between buses are regenerated, reshaped and transmitted transparently to the SCSI subsystem.

Features of the LSI53C140-160QFP are:(1)self-calibration; (2)adjust for periodic variations in voltage, temperature and silicon process; (3)signals between buses are regenerated, reshaped and transmitted transparently to the SCSI bus subsystem; (4)a flexible SCSI expander that supports any combination of LVD, SE or HVD transceivers; (5)creates distinct SCSI bus segments that are electrically isolated from each other; (6)fully integrated LVDlink transceivers for direct attach to either LVD, SE or HVD(requires external transceivers); (7)does not require external precision regulators to operate in LVD mode; (8)operates as a SCSI bus repeater.

The absolute maximum ratings of the LSI53C140-160QFP can be summarized as:(1)supply voltage:-0.5 to 4.5V;(2)storage temperature:-55 to 150;(3)input voltage:5.25V;(4)electrostatic discharge:2kV;(6)latch-up current:±150mA.The LSI53C140 features TolerANT technology, which includes active negation on the SCSI drivers and input signal filtering on the SCSI receivers. Active negation actively drives the SCSI Request,Acknowledge, Data, and Parity signals HIGH rather than allowing them to be passively pulled up by terminators.The LSI53C140 supports LVD technology for SCSI, a signaling technology that increases the reliability of SCSI data transfers over longer distances than those supported by SE SCSI technology. The low current output of LVD allows the I/O transceivers to be integrated directly onto the chip. LVD provides the reliability of HVD SCSI technology without the added cost of external differential transceivers.LVD allows a longer SCSI cable and more devices on the bus. LVD provides a long-term migration path to even faster SCSI transfer rates without compromising signal integrity, cable length, or connectivity.