UCC5606DP [Unitrode]

The UCC5606 is ideal for high performance 3.3-V SCSI systems. The key features contributing to such low operating voltage are the 0.1-V drop out regulator and the 2.7-V reference. During disconnect the supply current is typically only 0.5 µA, which makes the device attractive for battery powered systems. The UCC5606 is designed with an ultra-low channel capacitance of 1.8 pF, which eliminates effects on signal integrity from disconnected terminators at interim points on the bus. It can be programmed for either a 110-Ω or 2.5-kΩ termination. The power amplifier output stage allows the UCC5606 to source full termination current and sink active negation current when all termination lines are actively negated. It is pin-for-pin compatible with Unitrode’s other 9-line single-ended SCSI terminators, except that DISCNCT is now active low. The UCC5606 is completely hot pluggable and appears as high impedance at the terminating channels with TRMPWR = 0 V or open. Internal circuit trimming is utilized to trim the 110-Ω termination impedance to a 7% tolerance and the output current to a 4% tolerance. Other features include thermal shutdown and current limit.