●The UCC5617 provides 18 lines of active termination for a SCSI (Small Computers Systems Interface) parallel bus. The SCSI standard recommends and Fast-20 (Ultra) requires active termination at both ends of the cable.
●Pin for pin compatible with the UC5609, the UCC5617 is ideal for high performance 5V SCSI systems, Termpwr 4.0-5.25V. During disconnect the supply current is only 50uA typical, which makes the IC attractive for lower powered systems.
●The UCC5617 is designed with a low channel capacitance of 2pF, which eliminates effects on signal integrity from disconnected terminators at interim points on the bus.
●The power amplifier output stage allows the UCC5617 to source full termination current and sink active negation current when all termination lines are actively negated.
●The UCC5617, as with all Unitrode terminators, is completely hot pluggable and appears as high impedance at the terminating channels with TRMPWR = 0V or open.
●Internal circuit trimming is utilized, first to trim the 110 impedance, and then most importantly, to trim the output current as close to the maximum SCSI-3 specification as possible, which maximizes noise margin in fast SCSI operation.
●This device is offered in low thermal resistance versions of the industry standard 28 pin wide body SOIC.
● Complies with SCSI, SCSI-2, SCSI-3, SPI and FAST-20 Standards
● 2pF Channel Capacitance During Disconnect
● 50mA Supply Current in Disconnect Mode
● 110 Termination
● SCSI Hot Plugging Compliant, 10nA Typical
● +400mA Sinking Current for Active Negation
● 650mA Sourcing Current for Termination
● Trimmed Impedance to 5%
● Thermal Shutdown
● Current Limit
Part 3D Model
