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UCC5620 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC5620 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 9 page UCC5620 DESCRIPTION UCC5620 provides 27 lines of active termination for a SCSI (Small Com- puter Systems Interface) parallel bus. The SCSI standard recommends active termination at both ends of the cable. The UCC5620 is ideal for high performance 5V SCSI systems. During disconnect the supply current is typically only 100 µA, which makes the IC attractive for lower powered systems. The UCC5620 is designed with a low channel capacitance of 2.5pF, which eliminates effects on signal integrity from disconnected terminators at interim points on the bus. The power amplifier output stage allows the UCC5620 to source full ter- mination current and sink active negation current when all termination lines are actively negated. The UCC5620, 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 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 QSOP (MWP). Consult QSOP-36 packaging diagram for exact dimensions. 27-Line SCSI Terminator BLOCK DIAGRAM FEATURES • Complies with SCSI, SCSI-2, SCSI-3, SPI and FAST-20 (Ultra) Standards • 2.5pF Channel Capacitance during Disconnect • 100mA 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 SLUS287B - OCTOBER 1999 - REVISED APRIL 2002 UDG-96109 Circuit Design Patented |
Similar Part No. - UCC5620_09 |
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Similar Description - UCC5620_09 |
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