27 - Line SCSI Terminator With Split Reverse Disconnect

UCC5621 provides 27 lines of active termination for a SCSI (Small Com- puter Systems Interface) parallel bus. The SCSI standard recommends ac- tive termination at both ends of the cable. The UCC5621 is ideal for high performance 5V SCSI systems. During dis- connect the supply current is typically only 100A, which makes the IC at- tractive for lower powered systems. The UCC5621 features a split reverse disconnect allowing the user to con- trol termination lines 10 to 27 with disconnect one, DISCNCT1, and control terminiation lines 1 to 9 with disconnect two, DISCNCT2. The UCC5621 is designed with a low channel capacitance of 2.5pF, which eliminates effects on signal integrity from disconnected terminators at in- terim points on the bus. The power Amplifier output stage allows the UCC5621 to source full termi- nation current and sink active negation current when all termination lines are actively negated. The UCC5621 as with all Unitrode terminators, is completely hot plugga- ble and appears as high impedance at the teminating channels with VTRMPWR = 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- 20 SCSI operation. By Texas Instruments
UCC5621 's PackagesUCC5621 's pdf datasheet

UCC5621 Pinout, Pinouts
UCC5621 pinout,Pin out
This is one package pinout of UCC5621,If you need more pinouts please download UCC5621's pdf datasheet.

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