UCC5620 27-Line SCSI Terminator FEATURES DESCRIPTION • Complies with SCSI, SCSI-2, SCSI-3, UCC5620 provides 27 lines of active termination for a SCSI (Small Com- SPIand FAST-20 (Ultra) Standards puter Systems Interface) parallel bus. The SCSI standard recommends active termination at both ends of the cable. • 2.5pF Channel Capacitance during Disconnect The UCC5620 is ideal for high performance 5V SCSI systems. During disconnectthesupplycurrentistypicallyonly100µA,whichmakestheIC • 100mA Supply Current in Disconnect attractive for lower powered systems. Mode The UCC5620 is designed with a low channel capacitance of 2.5pF, • 4V To 7V Operation whicheliminateseffectsonsignalintegrityfromdisconnectedterminators • 110 Termination at interim points on the bus. • Completely Meets SCSI Hot Plugging The power amplifier output stage allows the UCC5620 to source full ter- mination current and sink active negation current when all termination • –900mA Sourcing Current for lines are actively negated. Termination TheUCC5620,aswithallUnitrodeterminators,iscompletelyhotplugga- • +500mA Sinking Current for Active ble and appears as high impedance at the teminating channels with Negation V = 0V or open. TRMPWR • Logic Command Disconnects all Internal circuit trimming is utilized, first to trim the 110 impedance, and Termination Lines thenmostimportantly,totrimtheoutputcurrentasclosetothemaximum • Trimmed Impedance to 5% SCSI-3 specification as possible, which maximizes noise margin in fast SCSI operation. • Current Limit and Thermal Shutdown Protection Other features include thermal shutdown and current limit.This device is offeredinlowthermalresistanceversionsoftheindustrystandard36-Pin Wide BodyQSOP(MWP). ConsultQSOP-36packaging diagram for exact dimensions. BLOCK DIAGRAM Circuit Design Patented UDG-96109 SLUS287B - OCTOBER 1999 - REVISED APRIL 2002

UCC5620 ABSOLUTE MAXIMUM RATINGS CONNECTION DIAGRAM TermpwrVoltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+7V SSOP-36(Top View) Signal Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . .0V to +7V Regulator Output Current. . . . . . . . . . . . . . . . . . . . . . . . . .1.5A MWPPackage Storage Temperature. . . . . . . . . . . . . . . . . . .−65 C to +150 C Junction Temperature. . . . . . . . . . . . . . . . . . .−55 C to +150 C Lead Temperature (Soldering, 10 Sec.). . . . . . . . . . . . .+300 C LINE8 1 36 LINE7 Currentsarepositiveinto,negativeoutofthespecifiedtermi- LINE9 2 35 LINE6 nal.ConsultPackagingSectionofDatabookforthermallimita- tions and considerations of packages. LINE23 3 34 LINE5 LINE24 4 33 LINE22 LINE25 5 32 LINE21 LINE26 6 31 LINE20 LINE27 7 30 LINE19 GND 8 29 REG GND 9 28 GND GND 10 27 GND DISCNCT 11 26 GND LINE10 12 25 TRMPWR LINE11 13 24 LINE18 LINE12 14 23 LINE17 LINE13 15 22 LINE16 LINE14 16 21 LINE15 LINE1 17 20 LINE4 LINE2 18 19 LINE3 ELECTRICAL CHARACTERISTICSUnless otherwise stated, these specifications apply for T = 0°C to 70°C,TRMPWR A = 4.75V,DISCNCT= 0V, T =T . A J PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Supply Current Section TRMPWRSupply Current All Termination Lines = Open 1 2 mA All Termination Lines = 0.2V 630 650 mA Power Down Mode DISCNCT=TRMPWR 100 200 µA Output Section (Termination Lines) Termination Impedance (Note 3) 104.5 110 115.5 Ω Output High Voltage (Note 1) 2.6 2.8 3.0 V Max Output Current V = 0.2V,T = 25°C −22.1 −23.3 −24 mA LINE J V = 0.2V −20.7 −23.3 −24 mA LINE V = 0.2V,TRMPWR= 4V,T = 25°C (Note 1) −21 −23 −24 mA LINE J V = 0.2V,TRMPWR= 4V (Note 1) −20 −23 −24 mA LINE V = 0.5V −22.4 mA LINE Output Leakage DISCNCT= 2.4V,TRMPWR= 0V to 5.25V 10 400 nA Output Capacitance DISCNCT= 2.4V (Note 2) 2.5 4 pF 2

UCC5620 ELECTRICAL CHARACTERISTICSUnless otherwise stated, these specifications apply for T = 0°C to 70°C,TRMPWR A = 4.75V,DISCNCT= 0V, T =T . A J PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Regulator Section Regulator Output Voltage 2.6 2.8 3.0 V Drop Out Voltage All Termination Lines = 0.2V 0.4 0.8 V Short Circuit Current V = 0V −650 −900 –1300 mA REG Sinking Current Capability V = 3.5V 300 500 900 mA REG Thermal Shutdown 170 C° Thermal ShutdownHysteresis 10 C° Disconnect Section Disconnect Threshold 0.8 1.5 2.0 V Input Current DISCNCT= 0V –20 –60 µA Note 1:Measuring each termination line while other 26 are low (0.2V). Note 2:Ensured by design.Not 100% tested in production. (V N.L.−0.2V) Note 3:Tested by measuringI withV = 0.2V andV with no load, then calculate: Z= OUT OUT OUT OUT I at0.2V OUT PIN DESCRIPTIONS DISCNCT: Taking this pin high or leaving it open causes GND:Ground reference for the IC. all channels to become high impedance, and the chip to LINE1 - LINE27:110 termination channels. go into low-power mode;a low state allows the channels to provide normal termination. REG:Output of the internal 2.7V regulator. TRMPWR:Power for the IC. APPLICATION INFORMATION UCC5620 TRMPWR TRMPWR DISCNCT 4.7µF REG L1 L27 4.7µF DATABYTES1AND2 CONTROLBITS +2PARITYBITS TODRIVERS ANDRECEIVERS TOSCSIBUS UDG-98188 Figure 1.Typical Wide SCSI Bus Configuration Using the UCC5620 3

PACKAGE OPTION ADDENDUM www.ti.com 18-Feb-2005 PACKAGING INFORMATION OrderableDevice Status(1) Package Package Pins Package EcoPlan(2) Lead/BallFinish MSLPeakTemp(3) Type Drawing Qty UCC5620FQPTR OBSOLETE LQFP PT 48 None CallTI CallTI UCC5620MWP ACTIVE SSOP DCE 36 25 None CUSNPB Level-1-220C-UNLIM UCC5620MWPTR ACTIVE SSOP DCE 36 1000 None CUSNPB Level-1-220C-UNLIM (1)Themarketingstatusvaluesaredefinedasfollows: ACTIVE:Productdevicerecommendedfornewdesigns. LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect. NRND:Notrecommendedfornewdesigns.Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartin anewdesign. PREVIEW:Devicehasbeenannouncedbutisnotinproduction.Samplesmayormaynotbeavailable. OBSOLETE:TIhasdiscontinuedtheproductionofthedevice. (2)EcoPlan-Maynotbecurrentlyavailable-pleasecheckhttp://www.ti.com/productcontentforthelatestavailabilityinformationandadditional productcontentdetails. None:NotyetavailableLead(Pb-Free). Pb-Free(RoHS):TI'sterms"Lead-Free"or"Pb-Free"meansemiconductorproductsthatarecompatiblewiththecurrentRoHSrequirements forall6substances,includingtherequirementthatleadnotexceed0.1%byweightinhomogeneousmaterials.Wheredesignedtobesoldered athightemperatures,TIPb-Freeproductsaresuitableforuseinspecifiedlead-freeprocesses. Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens, includingbromine(Br)orantimony(Sb)above0.1%oftotalproductweight. (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incomingmaterialsandchemicals.TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimited informationmaynotbeavailableforrelease. InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTI toCustomeronanannualbasis. Addendum-Page1

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