IC datasheet pdf-OPA2674,pdf(Dual Wideband High Output Current Operational Amplifier)

LM2674SIMPLE SWITCHER ®Power Converter High Efficiency 500mA Step-Down Voltage RegulatorGeneral DescriptionThe LM2674series of regulators are monolithic integrated circuits built with a LMDMOS process.These regulators provide all the active functions for a step-down (buck)switching regulator,capable of driving a 500mA load current with excellent line and load regulation.These devices are available in fixed output voltages of 3.3V,5.0V,12V,and an adjustable output version.Requiring a minimum number of external components,these regulators are simple to use and include patented internal frequency compensation (Patent Nos.5,382,918and 5,514,947)and a fixed frequency oscillator.The LM2674series operates at a switching frequency of 260kHz,thus allowing smaller sized filter components than what would be needed with lower frequency switching regu-lators.Because of its very high efficiency (>90%),the cop-per traces on the printed circuit board are the only heat sinking needed.A family of standard inductors for use with the LM2674are available from several different manufacturers.This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs.Also included in the datasheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies.Other features include a guaranteed ±1.5%tolerance on output voltage within specified input voltages and output load conditions,and ±10%on the oscillator frequency.Ex-ternal shutdown is included,featuring typically 50µA stand-by current.The output switch includes current limiting,as well as thermal shutdown for full protection under fault conditions.To simplify the LM2674buck regulator design procedure,there exists computer design software,LM267X Made Simple (version 6.0).Featuresn Efficiency up to 96%n Available in SO-8,8-pin DIP and LLP packages n Computer Design Software LM267X Made Simple (version 6.0)n Simple and easy to design withn Requires only 5external components n Uses readily available standard inductorsn 3.3V,5.0V,12V,and adjustable output versionsn Adjustable version output voltage range:1.21V to 37V n ±1.5%max output voltage tolerance over line and load conditionsn Guaranteed 500mA output load current n 0.25ΩDMOS Output Switchn Wide input voltage range:8V to 40Vn 260kHz fixed frequency internal oscillatorn TTL shutdown capability,low power standby mode n Thermal shutdown and current limit protectionTypical Applicationsn Simple High Efficiency (>90%)Step-Down (Buck)Regulatorn Efficient Pre-Regulator for Linear Regulators n Positive-to-Negative ConverterTypical Application10004101SIMPLE SWITCHER ®is a registered trademark of National Semiconductor Corporation.Windows ®is a registered trademark of Microsoft Corporation.May 2001LM2674SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage Regulator©2001National Semiconductor Corporation Connection Diagrams16-Lead LLP Surface Mount PackageTop View8-Lead PackageTop View10004138LLP PackageSee NSC Package Drawing Number LDA16A10004102SO-8/DIP PackageSee NSC Package Drawing Number MO8A/N08ETABLE 1.Package Marking and Ordering InformationOutput Voltage Order InformationPackage MarkingSupplied as:16Lead LLP12LM2674LD-12S0009B 1000Units on Tape and Reel 12LM2674LDX-12S0009B 4500Units on Tape and Reel 3.3LM2674LD-3.3S000AB 1000Units on Tape and Reel 3.3LM2674LDX-3.3S000AB 4500Units on Tape and Reel 5.0LM2674LD-5.0S000BB 1000Units on Tape and Reel 5.0LM2674LDX-5.0S000BB 4500Units on Tape and Reel ADJ LM2674LD-ADJ S000CB 1000Units on Tape and Reel ADJLM2674LDX-ADJS000CB4500Units on Tape and ReelSO-812LM2674M-122674M-12Shipped in Anti-Static Rails 12LM2674MX-122674M-122500Units on Tape and Reel 3.3LM2674M-3.32674M-3.3Shipped in Anti-Static Rails 3.3LM2674MX-3.32674M-3.32500Units on Tape and Reel 5.0LM2674M-5.02674M-5.0Shipped in Anti-Static Rails 5.0LM2674MX-5.02674M-5.02500Units on Tape and Reel ADJ LM2674M-ADJ 2674M-ADJ Shipped in Anti-Static Rails ADJLM2674MX-ADJ2674M-ADJ2500Units on Tape and ReelDIP12LM2674N-12LM2674N-12Shipped in Anti-Static Rails 3.3LM2674N-3.3LM2674N-3.3Shipped in Anti-Static Rails 5.0LM2674N-5.0LM2674N-5.0Shipped in Anti-Static Rails ADJLM2674N-ADJLM2674N-ADJShipped in Anti-Static RailsL M 2674 2Absolute Maximum Ratings(Note1)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.Supply Voltage45V ON/OFF Pin Voltage−0.1V≤V SH≤6V Switch Voltage to Ground−1V Boost Pin Voltage V SW+8V Feedback Pin Voltage−0.3V≤V FB≤14V ESD SusceptibilityHuman Body Model(Note2)2kV Power Dissipation Internally Limited Storage Temperature Range−65˚C to+150˚C Lead TemperatureM PackageVapor Phase(60s)+215˚C Infrared(15s)+220˚C N Package(Soldering,10s)+260˚C LLP Package(See AN-1187)Maximum Junction Temperature+150˚COperating RatingsSupply Voltage 6.5V to40VJunction Temperature Range−40˚C≤T J≤+125˚CElectrical CharacteristicsLM2674-3.3Specifications with standard type face are for TJ=25˚C,and those with bold type face apply over full Operating Temperature Range.Symbol Parameter Conditions Typical Min Max Units(Note4)(Note5)(Note5) SYSTEM PARAMETERS Test Circuit Figure2(Note3)V OUT Output Voltage V IN=8V to40V,I LOAD=20mA to500mA 3.3 3.251/3.201 3.350/3.399V V OUT Output Voltage V IN=6.5V to40V,I LOAD=20mA to250mA 3.3 3.251/3.201 3.350/3.399V ηEfficiency V IN=12V,I LOAD=500mA86% LM2674-5.0Symbol Parameter Conditions Typical Min Max Units(Note4)(Note5)(Note5) SYSTEM PARAMETERS Test Circuit Figure2(Note3)V OUT Output Voltage V IN=8V to40V,I LOAD=20mA to500mA 5.0 4.925/4.850 5.075/5.150V V OUT Output Voltage V IN=6.5V to40V,I LOAD=20mA to250mA 5.0 4.925/4.850 5.075/5.150V ηEfficiency V IN=12V,I LOAD=500mA90% LM2674-12Symbol Parameter Conditions Typical Min Max Units(Note4)(Note5)(Note5) SYSTEM PARAMETERS Test Circuit Figure2(Note3)V OUT Output Voltage V IN=15V to40V,I LOAD=20mA to500mA1211.82/11.6412.18/12.36V ηEfficiency V IN=24V,I LOAD=500mA94% LM2674-ADJSymbol Parameter Conditions Typ Min Max Units(Note4)(Note5)(Note5) SYSTEM PARAMETERS Test Circuit Figure3(Note3)V FB FeedbackVoltage V IN=8V to40V,I LOAD=20mA to500mAV OUT Programmed for5V(see Circuit of Figure3)1.210 1.192/1.174 1.228/1.246VLM26743LM2674-ADJ(Continued)Symbol Parameter ConditionsTyp Min Max Units(Note 4)(Note 5)(Note 5)V FBFeedback Voltage V IN =6.5V to 40V,I LOAD =20mA to 250mA V OUT Programmed for 5V (see Circuit of Figure 3) 1.210 1.192/1.1741.228/1.246V ηEfficiencyV IN =12V,I LOAD =500mA90%All Output Voltage VersionsSpecifications with standard type face are for T J =25˚C,and those with bold type face apply over full Operating Tempera-ture Range .Unless otherwise specified,V IN =12V for the 3.3V,5V,and Adjustable versions and V IN =24V for the 12V ver-sion,and I LOAD =100mA.Symbol ParametersConditionsTyp MinMax Units DEVICE PARAMETERSI QQuiescent CurrentV FEEDBACK =8V2.53.6mAFor 3.3V,5.0V,and ADJ Versions V FEEDBACK =15V 2.5mAFor 12V VersionsI STBY Standby Quiescent Current ON/OFF Pin =0V50100/150µA I CL Current Limit0.80.62/0.5751.2/1.25A I LOutput Leakage CurrentV IN =40V,ON/OFF Pin =0V V SWITCH =0V125µA V SWITCH =−1V,ON/OFF Pin =0V615mA R DS(ON)Switch On-Resistance I SWITCH =500mA 0.250.40/0.60Ωf O Oscillator Frequency Measured at Switch Pin 260225275kHz D Maximum Duty Cycle 95%Minimum Duty Cycle 0%I BIAS Feedback Bias CurrentV FEEDBACK =1.3V ADJ Version Only 85nA V S/D ON/OFF PinVoltage Thesholds 1.40.8 2.0V I S/D ON/OFF Pin Current ON/OFF Pin =0V20737µA θJAThermal ResistanceN Package,Junction to Ambient (Note 6)95˚C/WM Package,Junction to Ambient (Note 6)105Note 1:Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.Operating Ratings indicate conditions for which the device is intended to be functional,but device parameter specifications may not be guaranteed under these conditions.For guaranteed specifications and test conditions,see the Electrical Characteristics.Note 2:The human body model is a 100pF capacitor discharged through a 1.5k Ωresistor into each pin.Note 3:External components such as the catch diode,inductor,input and output capacitors,and voltage programming resistors can affect switching regulator performance.When the LM2674is used as shown in Figures 2,3test circuits,system performance will be as specified by the system parameters section of the Electrical Characteristics.Note 4:Typical numbers are at 25˚C and represent the most likely norm.Note 5:All limits guaranteed at room temperature (standard type face)and at temperature extremes (bold type face).All room temperature limits are 100%production tested.All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC)methods.All limits are used to calculate Average Outgoing Quality Level (AOQL).Note 6:Junction to ambient thermal resistance with approximately 1square inch of printed circuit board copper surrounding the leads.Additional copper area will lower thermal resistance further.See Application Information section in the application note accompanying this datasheet and the thermal model in LM267X Made Simple (version 6.0)software.The value θJ−A for the LLP (LD)package is specifically dependent on PCB trace area,trace material,and the number of layers and thermal vias.For improved thermal resistance and power dissipation for the LLP package,refer to Application Note AN-1187.L M 2674 4Typical PerformanceCharacteristicsNormalizedOutput Voltage Line Regulation Efficiency100041031000410410004105Drain-to-SourceResistance Switch Current LimitOperating Quiescent Current100041061000410710004108Standby Quiescent CurrentON/OFF ThresholdVoltageON/OFF PinCurrent(Sourcing)100041091000411010004111LM26745Typical Performance Characteristics(Continued)Switching FrequencyFeedback Pin Bias CurrentPeak Switch Current100041121000411310004114Dropout Voltage —3.3V Option Dropout Voltage —5.0V Option1000411510004116L M 2674 6LM2674 Block Diagram Array10004117*Active Inductor Patent Number5,514,947†Active Capacitor Patent Number5,382,918FIGURE1.7Typical PerformanceCharacteristics (Circuit of Figure 2)Continuous Mode Switching Waveforms V IN =20V,V OUT =5V,I LOAD =500mA L =100µH,C OUT =100µF,C OUT ESR =0.1ΩDiscontinuous Mode Switching Waveforms V IN =20V,V OUT =5V,I LOAD =300mAL =15µH,C OUT =68µF (2x),C OUT ESR =25m Ω10004118Horizontal Time Base:1µs/divA:V SW Pin Voltage,10V/div.B:Inductor Current,0.2A/divC:Output Ripple Voltage,50mV/div AC-Coupled10004119Horizontal Time Base:1µs/divA:V SW Pin Voltage,10V/div.B:Inductor Current,0.5A/divC:Output Ripple Voltage,20mV/div AC-CoupledLoad Transient Response for Continuous ModeV IN =20V,V OUT =5V,L =100µH,C OUT =100µF,C OUT ESR =0.1ΩLoad Transient Response for Discontinuous ModeV IN =20V,V OUT =5V,L =47µH,C OUT =68µF,C OUT ESR =50m Ω10004120Horizontal Time Base:50µs/divA:Output Voltage,100mV/div,AC-Coupled.B:Load Current:100mA to 500mA Load Pulse10004121Horizontal Time Base:200µs/divA:Output Voltage,100mV/div,AC-Coupled.B:Load Current:100mA to 400mA Load PulseL M 2674 8Test Circuit and Layout Guidelines10004122C IN -22µF,50V Tantalum,Sprague “199D Series”C OUT -47µF,25V Tantalum,Sprague “595D Series”D1-3.3A,50V Schottky Rectifier,IR 30WQ05F L1-68µH Sumida #RCR110D-680L C B -0.01µF,50V CeramicFIGURE 2.Standard Test Circuits and Layout GuidesFixed Output Voltage Versions10004123C IN -22µF,50V Tantalum,Sprague “199D Series”C OUT -47µF,25V Tantalum,Sprague “595D Series”D1-3.3A,50V Schottky Rectifier,IR 30WQ05F L1-68µH Sumida #RCR110D-680L R1-1.5k Ω,1%C B -0.01µF,50V CeramicFor a 5V output,select R2to be 4.75k Ω,1%where V REF =1.21VUse a 1%resistor for best stability.FIGURE 3.Standard Test Circuits and Layout GuidesAdjustable Output Voltage VersionsLM26749LM2674Series Buck Regulator Design Procedure (Fixed Output)PROCEDURE (Fixed Output Voltage Version)EXAMPLE (Fixed Output Voltage Version)To simplify the buck regulator design procedure,NationalSemiconductor is making available computer design software to be used with the SIMPLE SWITCHER line of switchingregulators.LM267X Made Simple (version 6.0)is available on Windows ®3.1,NT,or 95operating systems.Given:Given:V OUT =Regulated Output Voltage (3.3V,5V,or 12V)V OUT =5V V IN (max)=Maximum DC Input Voltage V IN (max)=12V I LOAD (max)=Maximum Load Current I LOAD (max)=500mA 1.Inductor Selection (L1)1.Inductor Selection (L1)A.Select the correct inductor value selection guide from Figure 4,Figure 5or Figure 6(output voltages of 3.3V,5V,or 12V respectively).For all other voltages,see the design procedure for the adjustable version.e the inductor selection guide for the 5V version shown in Figure 5.B.From the inductor value selection guide,identify theinductance region intersected by the Maximum Input Voltage line and the Maximum Load Current line.Each region isidentified by an inductance value and an inductor code (LXX). B.From the inductor value selection guide shown in Figure 5,the inductance region intersected by the 12V horizontal line and the 500mA vertical line is 47µH,and the inductor code is L13.C.Select an appropriate inductor from the four manufacturer’s part numbers listed in Figure 8.Each manufacturer makes a different style of inductor to allow flexibility in meeting various design requirements.Listed below are some of thedifferentiating characteristics of each manufacturer’s inductors:C.The inductance value required is 47µH.From the table in Figure 8,go to the L13line and choose an inductor part number from any of the four manufacturers shown.(In most instances,both through hole and surface mount inductors are available.)Schott:ferrite EP core inductors;these have very low leakage magnetic fields to reduce electro-magnetic interference (EMI)and are the lowest power loss inductorsRenco:ferrite stick core inductors;benefits are typically lowest cost inductors and can withstand E •T and transient peakcurrents above rated value.Be aware that these inductors have an external magnetic field which may generate more EMI than other types of inductors.Pulse:powered iron toroid core inductors;these can also be low cost and can withstand larger than normal E •T and transient peak currents.Toroid inductors have low EMI.Coilcraft:ferrite drum core inductors;these are the smallest physical size inductors,available only as SMT components.Be aware that these inductors also generate EMI —but less than stick inductors.Complete specifications for these inductors are available from the respective manufacturers.A table listing the manufacturers’phone numbers is located in Figure 9.2.Output Capacitor Selection (C OUT )2.Output Capacitor Selection (C OUT )A.Select an output capacitor from the output capacitor table in Figure ing the output voltage and the inductance value found in the inductor selection guide,step 1,locate the appropriate capacitor value and voltage rating.e the 5.0V section in the output capacitor table in Figure 10.Choose a capacitor value and voltage rating from the line that contains the inductance value of 47µH.The capacitance and voltage rating values corresponding to the 47µH inductor are the:L M 2674 10LM2674Series Buck Regulator Design Procedure(Fixed Output)(Continued) PROCEDURE(Fixed Output Voltage Version)EXAMPLE(Fixed Output Voltage Version)The capacitor list contains through-hole electrolytic capacitors from four different capacitor manufacturers and surface mount tantalum capacitors from two different capacitor manufacturers. It is recommended that both the manufacturers and the manufacturer’s series that are listed in the table be used.A table listing the manufacturers’phone numbers is located in Figure11.Surface Mount:68µF/10V Sprague594D Series.100µF/10V AVX TPS Series. Through Hole:68µF/10V Sanyo OS-CON SA Series. 150µF/35V Sanyo MV-GX Series. 150µF/35V Nichicon PL Series.150µF/35V Panasonic HFQ Series.3.Catch Diode Selection(D1)A.In normal operation,the average current of the catch diode is the load current times the catch diode duty cycle,1-D(D is the switch duty cycle,which is approximately the output voltage divided by the input voltage).The largest value of the catch diode average current occurs at the maximum load current and maximum input voltage(minimum D).For normal operation,the catch diode current rating must be at least1.3times greater than its maximum average current.However,if the power supply design must withstand a continuous output short,the diode should have a current rating equal to the maximum current limit of the LM2674.The most stressful condition for this diode is a shorted output condition.3.Catch Diode Selection(D1)A.Refer to the table shown in Figure12.In this example,a1A, 20V Schottky diode will provide the best performance.If the circuit must withstand a continuous shorted output,a higher current Schottky diode is recommended.B.The reverse voltage rating of the diode should be at least1.25times the maximum input voltage.C.Because of their fast switching speed and low forwardvoltage drop,Schottky diodes provide the best performance andefficiency.This Schottky diode must be located close to theLM2674using short leads and short printed circuit traces.4.Input Capacitor(C IN) 4.Input Capacitor(C IN)LM2674LM2674Series Buck Regulator Design Procedure (Fixed Output)(Continued)PROCEDURE (Fixed Output Voltage Version)EXAMPLE (Fixed Output Voltage Version)A low ESR aluminum or tantalum bypass capacitor is needed between the input pin and ground to prevent large voltagetransients from appearing at the input.This capacitor should be located close to the IC using short leads.In addition,the RMS current rating of the input capacitor should be selected to be at least 1⁄2the DC load current.The capacitor manufacturer data sheet must be checked to assure that this current rating is not exceeded.The curves shown in Figure 14show typical RMS current ratings for several different aluminum electrolytic capacitor values.A parallel connection of two or morecapacitors may be required to increase the total minimum RMS current rating to suit the application requirements.For an aluminum electrolytic capacitor,the voltage rating should be at least 1.25times the maximum input voltage.Caution must be exercised if solid tantalum capacitors are used.The tantalum capacitor voltage rating should be twice the maximum input voltage.The tables in Figure 15show the recommendedapplication voltage for AVX TPS and Sprague 594D tantalum capacitors.It is also recommended that they be surge current tested by the manufacturer.The TPS series available from AVX,and the 593D and 594D series from Sprague are all surgecurrent tested.Another approach to minimize the surge current stresses on the input capacitor is to add a small inductor in series with the input supply line.Use caution when using ceramic capacitors for input bypassing,because it may cause severe ringing at the V IN pin.The important parameters for the input capacitor are the input voltage rating and the RMS current rating.With a maximum input voltage of 12V,an aluminum electrolytic capacitor with a voltage rating greater than 15V (1.25x V IN )would be needed.The next higher capacitor voltage rating is 16V.The RMS current rating requirement for the input capacitor in a buck regulator is approximately 1⁄2the DC load current.In this example,with a 500mA load,a capacitor with an RMS current rating of at least 250mA is needed.The curves shown in Figure 14can be used to select an appropriate input capacitor.From the curves,locate the 16V line and note which capacitor values have RMS current ratings greater than 250mA.For a through hole design,a 100µF/16V electrolytic capacitor (Panasonic HFQ series,Nichicon PL,Sanyo MV-GX series or equivalent)would be adequate.Other types or othermanufacturers’capacitors can be used provided the RMS ripple current ratings are adequate.Additionally,for a completesurface mount design,electrolytic capacitors such as the Sanyo CV-C or CV-BS and the Nichicon WF or UR and the NIC Components NACZ series could be considered.For surface mount designs,solid tantalum capacitors can be used,but caution must be exercised with regard to the capacitor surge current rating and voltage rating.In this example,checking Figure 15,and the Sprague 594D series datasheet,a Sprague 594D 15µF,25V capacitor is adequate.5.Boost Capacitor (C B )5.Boost Capacitor (C B )This capacitor develops the necessary voltage to turn the switch gate on fully.All applications should use a 0.01µF,50V ceramic capacitor.For this application,and all applications,use a 0.01µF,50V ceramic capacitor.L M 2674INDUCTOR VALUE SELECTION GUIDES(For Continuous Mode Operation)10004126 FIGURE4.LM2674-3.310004127 FIGURE5.LM2674-5.010004128FIGURE6.LM2674-1210004129FIGURE7.LM2674-ADJLM2674INDUCTOR VALUE SELECTION GUIDES(For Continuous Mode Operation)(Continued)Ind.Ref.Desg.Inductance (µH)Current (A)SchottRencoPulse Engineering Coilcraft Through Surface ThroughSurface Through Surface Surface HoleMountHoleMountHoleMountMountL21500.216714392067144290RL-5470-4RL1500-150PE-53802PE-53802-S DO1608-154L31000.266714393067144300RL-5470-5RL1500-100PE-53803PE-53803-S DO1608-104L4680.326714394067144310RL-1284-68-43RL1500-68PE-53804PE-53804-S DO1608-683L5470.376714831067148420RL-1284-47-43RL1500-47PE-53805PE-53805-S DO1608-473L6330.446714832067148430RL-1284-33-43RL1500-33PE-53806PE-53806-S DO1608-333L7220.526714833067148440RL-1284-22-43RL1500-22PE-53807PE-53807-S DO1608-223L92200.326714396067144330RL-5470-3RL1500-220PE-53809PE-53809-S DO3308-224L101500.396714397067144340RL-5470-4RL1500-150PE-53810PE-53810-S DO3308-154L111000.486714398067144350RL-5470-5RL1500-100PE-53811PE-53811-S DO3308-104L12680.586714399067144360RL-5470-6RL1500-68PE-53812PE-53812-S DO3308-683L13470.706714400067144380RL-5470-7RL1500-47PE-53813PE-53813-S DO3308-473L14330.836714834067148450RL-1284-33-43RL1500-33PE-53814PE-53814-S DO3308-333L15220.996714835067148460RL-1284-22-43RL1500-22PE-53815PE-53815-S DO3308-223L182200.556714404067144420RL-5471-2RL1500-220PE-53818PE-53818-S DO3316-224L191500.666714405067144430RL-5471-3RL1500-150PE-53819PE-53819-S DO3316-154L201000.826714406067144440RL-5471-4RL1500-100PE-53820PE-53820-S DO3316-104L21680.996714407067144450RL-5471-5RL1500-68PE-53821PE-53821-S DO3316-683FIGURE 8.Inductor Manufacturers’Part Numbers Coilcraft Inc.Phone (800)322-2645FAX (708)639-1469Coilcraft Inc.,Europe Phone +441236730595FAX +441236730627Pulse Engineering Inc.Phone (619)674-8100FAX (619)674-8262Pulse Engineering Inc.,Phone +3539324107EuropeFAX +3539324459Renco Electronics Inc.Phone (800)645-5828FAX (516)586-5562Schott Corp.Phone (612)475-1173FAX(612)475-1786FIGURE 9.Inductor Manufacturers’Phone NumbersL M 2674INDUCTOR VALUE SELECTION GUIDES(For Continuous Mode Operation)(Continued)Output Voltage(V)Inductance(µH)Output CapacitorSurface Mount Through HoleSprague AVX TPS Sanyo OS-CON Sanyo MV-GX Nichicon Panasonic594D Series Series SA Series Series PL Series HFQ Series (µF/V)(µF/V)(µF/V)(µF/V)(µF/V)(µF/V)3.322120/6.3100/10100/10330/35330/35330/35 33120/6.3100/1068/10220/35220/35220/35 4768/10100/1068/10150/35150/35150/35 68120/6.3100/10100/10120/35120/35120/35 100120/6.3100/10100/10120/35120/35120/35 150120/6.3100/10100/10120/35120/35120/355.022100/16100/10100/10330/35330/35330/35 3368/101001068/10220/35220/35220/35 4768/10100/1068/10150/35150/35150/35 68100/16100/10100/10120/35120/35120/35 100100/16100/10100/10120/35120/35120/35 150100/16100/10100/10120/35120/35120/351222120/20(2x)68/2068/20330/35330/35330/353368/2568/2068/20220/35220/35220/354747/2068/2047/20150/35150/35150/356847/2068/2047/20120/35120/35120/3510047/2068/2047/20120/35120/35120/3515047/2068/2047/20120/35120/35120/3522047/2068/2047/20120/35120/35120/35FIGURE10.Output Capacitor TableNichicon Corp.Phone(847)843-7500FAX(847)843-2798Panasonic Phone(714)373-7857FAX(714)373-7102AVX Corp.Phone(845)448-9411FAX(845)448-1943Sprague/Vishay Phone(207)324-4140FAX(207)324-7223Sanyo Corp.Phone(619)661-6322FAX(619)661-1055FIGURE11.Capacitor Manufacturers’Phone NumbersLM2674INDUCTOR VALUE SELECTION GUIDES(For Continuous Mode Operation)(Continued)V R 500mA Diodes3A Diodes Surface Through Surface Through Mount Hole Mount Hole 20V SK121N5817SK321N5820B120SR102SR30230VSK131N5818SK331N5821B13011DQ0330WQ03F 31DQ03MBRS130SR10340VSK141N5819SK341N5822B14011DQ0430BQ040MBR340MBRS140SR10430WQ04F 31DQ0410BQ040MBRS340SR30410MQ040MBRD34015MQ04050VSK15MBR150SK35MBR350B15011DQ0530WQ05F31DQ0510BQ050SR105SR305FIGURE 12.Schottky Diode Selection Table International Rectifier Corp.Phone (310)322-3331FAX (310)322-3332Motorola,Inc.Phone (800)521-6274FAX (602)244-6609General Instruments Corp.Phone (516)847-3000FAX (516)847-3236Diodes,Inc.Phone (805)446-4800FAX(805)446-4850FIGURE 13.Diode Manufacturers’Phone Numbers10004130FIGURE 14.RMS Current Ratings for Low ESR Electrolytic Capacitors (Typical)L M 2674LM2674 INDUCTOR VALUE SELECTION GUIDES(For Continuous Mode Operation)(Continued)AVX TPSRecommended VoltageApplication Voltage Rating+85˚C Rating3.3 6.3510102012251535Sprague594DRecommended VoltageApplication Voltage Rating+85˚C Rating2.543.3 6.35108161220182524352950FIGURE15.Recommended Application Voltage for AVX TPS andSprague594D Tantalum Chip Capacitors Derated for85˚C.LM2674Series Buck Regulator Design Procedure (Adjustable Output)PROCEDURE (Adjustable Output Voltage Version)EXAMPLE (Adjustable Output Voltage Version)To simplify the buck regulator design procedure,NationalSemiconductor is making available computer design software to be used with the SIMPLE SWITCHER line of switchingregulators.LM267X Made Simple (version 6.0)is available for use on Windows 3.1,NT,or 95operating systems.Given:Given:V OUT =Regulated Output Voltage V OUT =20V V IN (max)=Maximum Input Voltage V IN (max)=28V I LOAD (max)=Maximum Load CurrentI LOAD (max)=500mAF =Switching Frequency (Fixed at a nominal 260kHz).F =Switching Frequency (Fixed at a nominal 260kHz).1.Programming Output Voltage (Selecting R 1and R 2,as shown in Figure 3)1.Programming Output Voltage (Selecting R 1and R 2,as shown in Figure 3)Use the following formula to select the appropriate resistor values.Select R 1to be 1k Ω,1%.Solve for R 2.where V REF =1.21VSelect a value for R 1between 240Ωand 1.5k Ω.The lower resistor values minimize noise pickup in the sensitive feedback pin.(For the lowest temperature coefficient and the best stability with time,use 1%metal film resistors.)R 2=1k (16.53−1)=15.53k Ω,closest 1%value is 15.4k Ω.R 2=15.4k Ω.2.Inductor Selection (L1) 2.Inductor Selection (L1)A.Calculate the inductor Volt •microsecond constant E •T (V •µs),from the following formula:A.Calculate the inductor Volt •microsecond constant (E •T),where V SAT =internal switch saturation voltage=0.25V and V D =diode forward voltage drop =0.5Ve the E •T value from the previous formula and match it with the E •T number on the vertical axis of the Inductor Value Selection Guide shown in Figure 7.B.E •T =21.6(V •µs)C.On the horizontal axis,select the maximum load current. C.I LOAD (max)=500mAD.Identify the inductance region intersected by the E •T value and the Maximum Load Current value.Each region is identified by an inductance value and an inductor code (LXX).D.From the inductor value selection guide shown in Figure 7,the inductance region intersected by the 21.6(V •µs)horizontal line and the 500mA vertical line is 100µH,and the inductor code is L20.E.Select an appropriate inductor from the four manufacturer’s part numbers listed in Figure 8.For information on the different types of inductors,see the inductor selection in the fixed output voltage design procedure.E.From the table in Figure 8,locate line L20,and select an inductor part number from the list of manufacturers part numbers.3.Output Capacitor Selection (C OUT )3.Output Capacitor SeIection (C OUT )A.Select an output capacitor from the capacitor code selection guide in Figure ing the inductance value found in theinductor selection guide,step 1,locate the appropriate capacitor code corresponding to the desired output voltage.e the appropriate row of the capacitor code selectionguide,in Figure 16.For this example,use the 15–20V row.The capacitor code corresponding to an inductance of 100µH is C20.L M 2674。

Data sheet acquired from Harris SemiconductorSCHS249BFeatures•Buffered Inputs•Typical Propagation Delay- 6.5ns at V CC = 5V , T A = 25o C, C L = 50pF•Exceeds 2kV ESD Protection MIL-STD-883, Method 3015•SCR-Latchup-Resistant CMOS Process and Circuit Design •Speed of Bipolar FAST™/AS/S with Significantly Reduced Power Consumption •Balanced Propagation Delays•AC Types Feature 1.5V to 5.5V Operation and Balanced Noise Immunity at 30% of the Supply •±24mA Output Drive Current -Fanout to 15 FAST™ ICs-Drives 50Ω Transmission LinesPinoutCD54AC273, CD54ACT273(CDIP)CD74AC273, CD74ACT273(PDIP , SOIC)TOP VIEWDescriptionThe ’AC273and ’ACT273devices are octal D-type flip-flops with reset that utilize advanced CMOS logic rmation at the D input is transferred to the Q output on the positive-going edge of the clock pulse.All eight flip-flops are controlled by a common clock (CP)and a common reset (MR).Resetting is accomplished by a low voltage level independent of the clock.1112131415161718201910987654321MR Q0D0D1Q1Q2D3D2Q3GND V CC D7D6Q6Q7Q5D5D4Q4CPOrdering InformationPART NUMBER TEMPERATURERANGE PACKAGE CD74AC273E0o C to 70o C -40o C to 85o C -55o C to 125o C 20 Ld PDIPCD54AC273F3A -55o C to 125o C 20 Ld CDIP CD74ACT273E0o C to 70o C -40o C to 85o C -55o C to 125o C 20 Ld PDIPCD54ACT273F3A -55o C to 125o C 20 Ld CDIP CD74AC273M0o C to 70o C -40o C to 85o C -55o C to 125o C 20 Ld SOICCD74ACT273M 0o C to 70o C -40o C to 85o C -55o C to 125o C20 Ld SOICNOTES:1.When ordering,use the entire part number.Add the suffix 96to obtain the variant in the tape and reel.2.Wafer and die for this part number is available which meets allelectrical specifications.Please contact your local sales office for ordering information.August 1998 - Revised July 2002CD54AC273, CD74AC273CD54ACT273, CD74ACT273Octal D Flip-Flop with ResetFunctional DiagramTRUTH TABLE INPUTSOUTPUTSRESET (MR)CLOCK CP DATA Dn Qn L X X L H ↑H H H ↑L L HLXQ0H =High level (steady state),L =Low level (steady state),X =Irrel-evant,↑=Transition from Low to High level,Q0=The level of Q before the indicated steady-state input conditions were estab-lished.Q0Q1Q2Q3Q4Q5Q6Q7RESET MRD0D1D2D3D4D5D6D7CLOCKCPDATA INPUTSDATAOUTPUTSAbsolute Maximum Ratings Thermal InformationDC Supply Voltage, V CC. . . . . . . . . . . . . . . . . . . . . . . .-0.5V to 6V DC Input Diode Current, I IKFor V I < -0.5V or V I > V CC + 0.5V. . . . . . . . . . . . . . . . . . . . . .±20mA DC Output Diode Current, I OKFor V O < -0.5V or V O > V CC + 0.5V . . . . . . . . . . . . . . . . . . . .±50mA DC Output Source or Sink Current per Output Pin, I OFor V O > -0.5V or V O < V CC + 0.5V . . . . . . . . . . . . . . . . . . . .±50mA DC V CC or Ground Current, I CC or I GND (Note 3) . . . . . . . . .±100mA Operating ConditionsTemperature Range, T A . . . . . . . . . . . . . . . . . . . . . .-55o C to 125o C Supply Voltage Range, V CC (Note 4)AC T ypes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5V to 5.5V ACT T ypes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V DC Input or Output Voltage, V I, V O . . . . . . . . . . . . . . . . .0V to V CC Input Rise and Fall Slew Rate, dt/dvAC T ypes, 1.5V to 3V . . . . . . . . . . . . . . . . . . . . . . . . .50ns (Max) AC T ypes, 3.6V to 5.5V. . . . . . . . . . . . . . . . . . . . . . . .20ns (Max) ACT T ypes, 4.5V to 5.5V. . . . . . . . . . . . . . . . . . . . . . .10ns (Max)Thermal Resistance,θJA(Typical, Note 5)E Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69o C/W M Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58o C/W Maximum Junction T emperature (Plastic Package) . . . . . . . . . .150o C Maximum Storage Temperature Range . . . . . . . . . .-65o C to 150o C Maximum Lead Temperature (Soldering 10s). . . . . . . . . . . . .300o CCAUTION:Stresses above those listed in“Absolute Maximum Ratings”may cause permanent damage to the device.This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.NOTES:3.For up to 4 outputs per device, add±25mA for each additional output.4.Unless otherwise specified, all voltages are referenced to ground.5.The package thermal impedance is calculated in accordance with JESD 51.DC Electrical SpecificationsPARAMETER SYMBOLTESTCONDITIONS VCC(V)25o C-40o C TO85o C-55o C TO125o CUNITS V I(V)I O(mA)MIN MAX MIN MAX MIN MAXAC TYPESHigh Level Input Voltage V IH-- 1.5 1.2- 1.2- 1.2-V3 2.1- 2.1- 2.1-V5.5 3.85- 3.85- 3.85-V Low Level Input Voltage V IL-- 1.5-0.3-0.3-0.3V3-0.9-0.9-0.9V5.5- 1.65- 1.65- 1.65V High Level Output Voltage V OH V IH or V IL-0.05 1.5 1.4- 1.4- 1.4-V-0.053 2.9- 2.9- 2.9-V-0.05 4.5 4.4- 4.4- 4.4-V-43 2.58- 2.48- 2.4-V-24 4.5 3.94- 3.8- 3.7-V-75(Note 6, 7)5.5-- 3.85---V-50(Note 6, 7)5.5---- 3.85-VLow Level Output VoltageV OLV IH or V IL0.05 1.5-0.1-0.1-0.1V 0.053-0.1-0.1-0.1V 0.05 4.5-0.1-0.1-0.1V 123-0.36-0.44-0.5V 24 4.5-0.36-0.44-0.5V 75(Note 6, 7) 5.5--- 1.65--V 50(Note 6, 7)5.5----- 1.65V Input Leakage Current I I V CC or GND - 5.5-±0.1-±1-±1µA Quiescent Supply Current MSI I CCV CC or GND5.5-8-80-160µAACT TYPESHigh Level Input Voltage V IH -- 4.5 to 5.52-2-2-V Low Level Input Voltage V IL -- 4.5 to 5.5-0.8-0.8-0.8V High Level Output VoltageV OHV IH or V IL-0.05 4.5 4.4- 4.4- 4.4-V -24 4.5 3.94- 3.8- 3.7-V -75(Note 6, 7) 5.5-- 3.85---V -50(Note 6, 7)5.5---- 3.85-V Low Level Output VoltageV OLV IH or V IL0.05 4.5-0.1-0.1-0.1V 24 4.5-0.36-0.44-0.5V 75(Note 6, 7) 5.5--- 1.65--V 50(Note 6, 7)5.5----- 1.65V Input Leakage Current I I V CC or GND - 5.5-±0.1-±1-±1µA Quiescent Supply Current MSII CC V CC or GND 0 5.5-8-80-160µA Additional Supply Current per Input Pin TTL Inputs High 1 Unit Load ∆I CCV CC -2.1- 4.5 to 5.5- 2.4- 2.8-3mANOTES:6.Test one output at a time for a 1-second maximum duration.Measurement is made by forcing current and measuring voltage to minimize power dissipation.7.Test verifies a minimum 50Ω transmission-line-drive capability at 85o C, 75Ω at 125o C.ACT Input Load TableINPUT UNIT LOADDn 0.5MR 0.57CP1NOTE:Unit load is ∆I CC limit specified in DC Electrical Specifications T able, e.g., 2.4mA max at 25o C.DC Electrical Specifications(Continued)PARAMETERSYMBOL TEST CONDITIONSV CC (V)25o C -40o C TO 85o C -55o C TO 125o C UNITS V I (V)I O (mA)MIN MAX MIN MAX MIN MAXPrerequisite For Switching FunctionPARAMETER SYMBOL V CC (V)-40o C TO 85o C-55o C TO 125o CUNITS MIN MAX MIN MAXAC TYPESData to CP Set-Up Time t SU 1.52-2-ns3.3(Note 9)2-2-ns5(Note 10)2-2-ns Hold Time t H 1.52-2-ns3.32-2-ns52-2-ns Removal Time,MR to CP t REM 1.52-2-ns3.32-2-ns52-2-ns MR Pulse Width t W 1.555-63-ns3.3 6.1-7-ns5 4.4-5-ns CP Pulse Width t W 1.555-63-ns3.3 6.1-7-ns5 4.4-5-ns CP Frequency f MAX 1.59-8-MHz3.381-71-MHz5114-100-MHz ACT TYPESData to CP Set-Up Time t SU5(Note 10)2-2-ns Hold Time t H52-2-ns Removal Time MR to CP t REM52-2-ns MR Pulse Width t W5 4.4-5-ns CP Pulse Width t W5 5.3-6-ns CP Frequency f MAX597-85-MHz Switching Specifications Input t r, t f = 3ns, C L= 50pF (Worst Case)PARAMETER SYMBOL V CC (V)-40o C TO 85o C-55o C TO 125o CUNITS MIN TYP MAX MIN TYP MAXAC TYPESPropagation Delay, CP to Qn t PLH, t PHL 1.5--154--169ns3.3(Note 9)4.9-17.2 4.7-18.9ns5(Note 10)3.5-12.3 3.4-13.5nsPropagation Delay,MR to Qnt PLH , t PHL1.5--154--169ns 3.3 4.9-17.2 4.7-18.9ns 53.5-12.3 3.4-13.5ns Input CapacitanceC I ---10--10pF Power Dissipation Capacitance C PD (Note 11)--45--45-pFACT TYPES Propagation Delay,CP to Qnt PLH , t PHL 5(Note 10)3.5-12.3 3.4-13.5ns Propagation Delay,MR to Qn t PLH , t PHL5 3.5-12.3 3.4-13.5ns Input CapacitanceC I ---10--10pF Power Dissipation Capacitance C PD (Note 11)--45--45-pFNOTES:8.Limits tested 100%.9.3.3V Min is at 3.6V, Max is at 3V.10.5V Min is at 5.5V, Max is at 4.5V.11.C PD is used to determine the dynamic power consumption per flip-flop.AC: P D = C PD V CC 2 f i =∑ (C L V CC 2 f o )ACT:P D =C PD V CC 2f i +∑(C L V CC 2f o )+V CC ∆I CC where f i =input frequency,f o =output frequency,C L =output load capacitance,V CC = supply voltage.FIGURE 1.PROPAGATION DELAY TIMES AND CLOCKPULSE WIDTH FIGURE 2.PREREQUISITE AND PROPAGATION DELAYTIMES FOR MASTER RESETSwitching Specifications Input t r , t f = 3ns, C L = 50pF (Worst Case)(Continued)PARAMETERSYMBOL V CC (V)-40o C TO 85o C-55o C TO 125o CUNITS MIN TYP MAX MIN TYP MAX 90%t f t r V SV S V SV SV St PLHt PHLt W 10%10%CP INPUT LEVEL QMR CPINPUT LEVELV SQV St REMV SV St PLHt WGNDINPUT(Q)FIGURE 3.PREREQUISITE FOR CLOCKDV S V S V SV S V S V St H (H)t SU (L)t H (L)t SU (H)CPOUTPUT LEVELDUT OUTPUTR L (NOTE)OUTPUT LOAD500ΩC L 50pFNOTE:For AC Series Only: When V CC = 1.5V , R L = 1k Ω.FIGURE 4.PROPAGATION DELAY TIMESACACT Input LevelV CC 3V Input Switching Voltage, V S 0.5 V CC 1.5V Output Switching Voltage, V S0.5 V CC0.5 V CCPACKAGING INFORMATIONOrderable Device Status(1)PackageType PackageDrawingPins PackageQtyEco Plan(2)Lead/Ball Finish MSL Peak Temp(3)CD54AC273F3A ACTIVE CDIP J201TBD A42N/A for Pkg Type CD54ACT273F3A ACTIVE CDIP J201TBD A42N/A for Pkg Type CD74AC273E ACTIVE PDIP N2020Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeCD74AC273EE4ACTIVE PDIP N2020Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeCD74AC273M ACTIVE SOIC DW2025Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74AC273M96ACTIVE SOIC DW202000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74AC273M96E4ACTIVE SOIC DW202000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74AC273M96G4ACTIVE SOIC DW202000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74AC273ME4ACTIVE SOIC DW2025Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74AC273MG4ACTIVE SOIC DW2025Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74ACT273E ACTIVE PDIP N2020Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeCD74ACT273EE4ACTIVE PDIP N2020Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeCD74ACT273M ACTIVE SOIC DW2025Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74ACT273M96ACTIVE SOIC DW202000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74ACT273M96E4ACTIVE SOIC DW202000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74ACT273M96G4ACTIVE SOIC DW202000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74ACT273ME4ACTIVE SOIC DW2025Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74ACT273MG4ACTIVE SOIC DW2025Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74ACT273PW ACTIVE TSSOP PW2070Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74ACT273PWE4ACTIVE TSSOP PW2070Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74ACT273PWG4ACTIVE TSSOP PW2070Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74ACT273PWR ACTIVE TSSOP PW202000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74ACT273PWRE4ACTIVE TSSOP PW202000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74ACT273PWRG4ACTIVE TSSOP PW202000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74ACT273SM96ACTIVE SSOP DB202000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMCD74ACT273SM96E4ACTIVE SSOP DB202000Green(RoHS&CU NIPDAU Level-1-260C-UNLIMOrderable Device Status(1)PackageType PackageDrawingPins PackageQtyEco Plan(2)Lead/Ball Finish MSL Peak Temp(3)no Sb/Br)CD74ACT273SM96G4ACTIVE SSOP DB202000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIM(1)The marketing status values are defined as follows:ACTIVE:Product device recommended for new designs.LIFEBUY:TI has announced that the device will be discontinued,and a lifetime-buy period is in effect.NRND:Not recommended for new designs.Device is in production to support existing customers,but TI does not recommend using this part in a new design.PREVIEW:Device has been announced but is not in production.Samples may or may not be available.OBSOLETE:TI has discontinued the production of the device.(2)Eco Plan-The planned eco-friendly classification:Pb-Free(RoHS),Pb-Free(RoHS Exempt),or Green(RoHS&no Sb/Br)-please check /productcontent for the latest availability information and additional product content details.TBD:The Pb-Free/Green conversion plan has not been defined.Pb-Free(RoHS):TI's terms"Lead-Free"or"Pb-Free"mean semiconductor products that are compatible with the current RoHS requirements for all6substances,including the requirement that lead not exceed0.1%by weight in homogeneous materials.Where designed to be soldered at high temperatures,TI Pb-Free products are suitable for use in specified lead-free processes.Pb-Free(RoHS Exempt):This component has a RoHS exemption for either1)lead-based flip-chip solder bumps used between the die and package,or2)lead-based die adhesive used between the die and leadframe.The component is otherwise considered Pb-Free(RoHS compatible)as defined above.Green(RoHS&no Sb/Br):TI defines"Green"to mean Pb-Free(RoHS compatible),and free of Bromine(Br)and Antimony(Sb)based flame retardants(Br or Sb do not exceed0.1%by weight in homogeneous material)(3)MSL,Peak Temp.--The Moisture Sensitivity Level rating according to the JEDEC industry 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 incoming materials and chemicals.TI and TI suppliers consider certain information to be proprietary,and thus CAS numbers and other limited information may not be available for release.In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s)at issue in this document sold by TI to Customer on an annual basis.TAPE AND REELINFORMATION*All dimensionsare nominalDevicePackage Type Package Drawing Pins SPQReel Diameter (mm)Reel Width W1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W (mm)Pin1Quadrant CD74AC273M96SOIC DW 202000330.024.410.813.0 2.712.024.0Q1CD74ACT273M96SOIC DW 202000330.024.410.813.0 2.712.024.0Q1CD74ACT273PWR TSSOP PW 202000330.016.4 6.957.1 1.68.016.0Q1CD74ACT273SM96SSOPDB202000330.016.48.27.52.512.016.0Q1PACKAGE MATERIALS INFORMATION11-Mar-2008*Alldimensions are nominal DevicePackage Type Package Drawing Pins SPQ Length (mm)Width (mm)Height (mm)CD74AC273M96SOIC DW 202000346.0346.041.0CD74ACT273M96SOIC DW 202000346.0346.041.0CD74ACT273PWRTSSOP PW 202000346.0346.033.0CD74ACT273SM96SSOP DB 202000346.0346.033.0PACKAGE MATERIALS INFORMATION 11-Mar-2008Pack Materials-Page 2IMPORTANT NOTICETexas Instruments Incorporated and its subsidiaries(TI)reserve the right to make corrections,modifications,enhancements,improvements, and other changes to its products and services at any time and to discontinue any product or service without notice.Customers should obtain the latest 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