GENERAL DESCRIPTION

The ML6509 BiCMOS SCSI terminator provides active termination in a SCSI system with single ended drivers and receivers, in full compliance with the SCSI-1, SCSI-2 and SCSI-3 recommendations. It provides a 2.85V reference through an internal 1V dropout linear regulator. Active SCSI termination helps the system designer to effectively control analog transmission line effects like ringing, noise, crosstalk, ground bounce, etc. In addition it provides greater immunity to voltage drops on the TERMPWR line of the SCSI bus.

FEATURES

■ Fully monolithic IC solution providing active termination for 9 lines of the SCSI bus

■ Low dropout voltage (1V) linear regulator, trimmed for accurate termination current, with 300mA current source capability

■ Output capacitance typically <5pF

■ Disconnect mode — logic pin to disconnect terminator from the SCSI bus, <100µA

■ Lowpower mode — for power conscious, portable system & peripheral applications, using less than 6 cables. (Equivalent to a 1mA current drive with a 2.5kW termination)

■ Current sinking — can sink current >10mA per line to handle active negation driver overshoots above 2.85V

■ Negative clamping on all lines to handle signal assertion transients

■ Regulator can source 200mA and sink 50mA while maintaining regulation

■ Current limit & thermal shutdown protection

■ Small and low profile package options; 16-pin SOIC (300 mil), 20-pin TSSOP (1 mil height)