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UCC5619 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC5619 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 7 page UCC5619 DESCRIPTION UCC5619 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 UCC5619 is ideal for high performance 5V SCSI systems. During dis- connect the supply current is typically only 100 µA, which makes the IC at- tractive for lower powered systems. The UCC5619 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 UCC5619 to source full termi- nation current and sink active negation current when all termination lines are actively negated. The UCC5619, as with all Unitrode terminators, is completely hot pluggable and appears as high impedance at the teminating channels with VTRMPWR = 0V or open. Internal circuit trimming is utilized, first to trim the 110 Ω 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. Other features include thermal shutdown and current limit. This device is offered in low thermal resistance versions of the industry standard 36 pin wide body QSSOP (MWP). Consult SSOP-36 (MWP QSSOP-36) Packaging Diagram for exact dimen- sions. 27-Line SCSI Terminator With Reverse Disconnect BLOCK DIAGRAM FEATURES • Complies with SCSI, SCSI-2, SCSI-3, SPI and FAST-20 (Ultra) Standards • 2.5pF Channel Capacitance during Disconnect • 100µA Supply Current in Disconnect Mode • 4V To 7V Operation • 110 Termination • Completely Meets SCSI Hot Plugging • –900mA Sourcing Current for Termination • +500mA Sinking Current for Active Negation • Logic Command Disconnects all Termination Lines • Trimmed Impedance to 5% • Current Limit and Thermal Shutdown Protection SLUS265A - OCTOBER 1998 - REVISED - APRIL 2002 UDG-96108 Circuit Design Patented |
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