sn74lvc4245a具有三态输出的八路总线收发器和3.3V至5V移位器

1、featuresdescription/orderinginformationdb, dw, or pw package(top view)123456789101112242322212019181716151413(5 v) vccadira1a2a3a4a5a6a7a8gndgndvccb (3.3 v)vccb (3.3 v)oeb1b2b3b4b5b6b7b8gndsn74lvc4245aoctal bustransceiverand 3.3-vto5-vshifterwith 3-state outputsscas375h march1994revisedmarch2005?bid

2、irectionalvoltagetranslator?5.5 v on a port and 2.7 v to 3.6 v on b port?controlinputsvih/villevels are referencedto vccavoltage?latch-upperformanceexceeds250 ma perjesd 17?esd protectionexceeds jesd 222000-v human-bodymodel (a114-a)200-v machinemodel (a115-a)1000-v charged-devicemodel (c101)this8-b

3、it(octal)noninvertingbustransceivercontains two separate supply rails; b port has vccb,which is set at 3.3 v, and a port has vcca, which isset at 5 v. this allows for translation from a 3.3-v toa 5-v environment, and vice versa.the sn74lvc4245ais designed for asynchronouscommunicationbetween data bu

4、ses. the device transmitsdata from the a bus to the b bus or from the b bus to the a bus, dependingon the logic levelat thedirection-control(dir) input. the output-enable(oe) input can be used to disable the device so the buses areeffectively isolated. the control circuitry (dir, oe) is powered by v

5、cca.the sn74lvc4245apinout allows the designerto switch to a normal all-3.3-vor all-5-v 20-pin 245 devicewithout board re-layout. the designer uses the data paths for pins 211and 1423 of the sn74lvc4245atoalign with the conventional 245 pinout.ordering informationtapackage(1)orderablepart numbertop-

6、side markingtube of 25sn74lvc4245adwsoic dwlvc4245areel of 2000sn74lvc4245adwrssop dbreel of 2000sn74lvc4245adbrlj245a40 c to 85 ctube of 60sn74lvc4245apwtssop pwreel of 2000sn74lvc4245apwrlj245areel of 250sn74lvc4245apwt(1)package drawings, standard packing quantities, thermal data, symbolization,

7、and pcb design guidelines are available tableinputsoperationoedirllb data to a buslha data to b bushxisolationplease be aware that an important notice concerning availability, standard warranty, and use in critical applications of texasinstruments semiconductor products and disclaimers thereto appea

8、rs at the end of this data sheet.productiondata information is current as of publication date.copyright? 19942005, texas instrumentsincorporatedproductsconformto specificationsper the termsof the texasinstrumentsstandardwarranty.productionprocessingdoesnotnecessarily include testing of all diroea1b1

9、to seven other channels232221absolutemaximumratings(1)sn74lvc4245aoctal bustransceiverand3.3-v to5-vshifterwith 3-state outputsscas375h march1994revisedmarch2005logic diagram (positive logic)over operating free-air temperaturerange for vcca= 4.5 v to 5.5 v (unless otherwise noted)minmaxunitvccasuppl

10、y voltage range0.56.5va port(2)0.5vcca+ 0.5viinput voltage rangevcontrol inputs0.56vooutput voltage rangea port(2)0.5vcca+ 0.5viikinput clamp currentvi 050maiokoutput clamp currentvo 050maiocontinuous output current 50macontinuous current through each vccaor gnd 100madb package63japackage thermal im

11、pedance(3)dw package46 c/wpw package88tstgstorage temperature range65150 c(1)stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratingsonly, and functional operation of the device at these or any other conditions beyond those indica

12、ted under recommendedoperatingconditions is not implied. exposure to absolute-maximum-ratedconditions for extended periods may affect device reliability.(2)this value is limited to 6 v maximum.(3)the package thermal impedance is calculated in accordance with jesd 51-absolutemaximumratings(1)recommen

13、dedoperatingconditions(1)recommendedoperatingconditions(1)sn74lvc4245aoctal bustransceiverand 3.3-vto5-vshifterwith 3-state outputsscas375h march1994revisedmarch2005over operating free-air temperaturerange for vccb= 2.7 v to 3.6 v (unless otherwise noted)minmaxunitvccbsupply voltage range0.54.6vviin

14、put voltage rangeb port(2)0.5vccb+ 0.5vvooutput voltage rangeb port(2)0.5vccb+ 0.5viikinput clamp currentvi 050maiokoutput clamp currentvo 050maiocontinuous output current 50macontinuous current through vccbor gnd 100madb package63japackage thermal impedance(3)dw package46 c/wpw package88tstgstorage

15、 temperature range65150 c(1)stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratingsonly, and functional operation of the device at these or any other conditions beyond those indicated under recommendedoperatingconditions is not i

16、mplied. exposure to absolute-maximum-ratedconditions for extended periods may affect device reliability.(2)this value is limited to 4.6 v maximum.(3)the package thermal impedance is calculated in accordance with jesd 51-7.for vcca= 4.5 v to 5.5 vminmaxunitvccasupply voltage4.55.5vvihhigh-level input

17、 voltage2vvillow-level input voltage0.8vviainput voltage0vccavvoaoutput voltage0vccaviohhigh-level output current24maiollow-level output current24mataoperating free-air temperature4085 c(1)all unused inputs of the device must be held at the associated vccor gnd to ensure proper device operation. ref

18、er to the tiapplication report, implications of slow or floating cmos inputs, literature number scba004.for vccb= 2.7 v to 3.6 vminmaxunitvccbsupply voltage2.73.6vvihhigh-level input voltagevccb= 2.7 v to 3.6 v2vvillow-level input voltagevccb= 2.7 v to 3.6 v0.8vvibinput voltage0vccbvvoboutput voltag

19、e0vccbvvccb= 2.7 v12iohhigh-level output currentmavccb= 3 v24vccb= 2.7 v12iollow-level output currentmavccb= 3 v24taoperating free-air temperature4085 c(1)all unused inputs of the device must be held at the associated vccor gnd to ensure proper device operation. refer to the tiapplication report, im

20、plications of slow or floating cmos inputs, literature number scbaelectricalcharacteristics(1)electricalcharacteristics(1)sn74lvc4245aoctal bustransceiverand3.3-v to5-vshifterwith 3-state outputsscas375h march1994revisedmarch2005over recommendedoperatingfree-air temperaturerange for vcca= 4.5 v to 5

21、.5 v (unless otherwise noted)parametertest conditionsvccamintyp(2)maxunit4.5 v4.3ioh= 100 a5.5 v5.3vohv4.5 v3.7ioh= 24ma5.5 v4.74.5 v0.2iol= 100 a5.5 v0.2volv4.5 v0.55iol= 24 ma5.5 v0.55iicontrol inputsvi= vccaor gnd5.5 v 1 aioz(3)a portvo= vccaor gnd5.5 v 5 aiccavi= vccaor gnd,io= 05.5 v80 a?icca(4

22、)one input at 3.4 v,other inputs at vccaor gnd5.5 v1.5macicontrol inputsvi= vccaor gndopen5pfcioa portvo= vccaor gnd5 v11pf(1)vccb= 2.7 v to 3.6 v(2)all typical values are measured at vcc= 5 v, ta= 25 c.(3)for i/o ports, the parameter iozincludes the input leakage current.(4)this is the increase in

23、supply current for each input that is at one of the specified ttl voltage levels, rather than 0 v or the associatedvcc.over recommendedoperatingfree-air temperaturerange for vccb= 2.7 v to 3.6 v (unless otherwise noted)parametertest conditionsvccbmintyp(2)maxunitioh= 100 a2.7 v to 3.6 vvcc0.22.7 v2.

24、2vohioh= 12mav3 v2.4ioh= 24ma3 v2iol= 100 a2.7 v to 3.6 v0.2voliol= 12 ma2.7 v0.4viol= 24 ma3 v0.55ioz(3)b portvo= vccbor gnd3.6 v 5 aiccbvi= vccbor gnd,io= 03.6 v50 a?iccb(4)one input at vccb0.6 v,other inputs at vccbor gnd2.7 v to 3.6 v0.5maciob portvo= vccbor gnd3.3 v11pf(1)vcca= 5 v 0.5 v(2)all

25、typical values are measured at vcc= 3.3 v, ta= 25 c.(3)for i/o ports, the parameter iozincludes the input leakage current.(4)this is the increase in supply current for each input that is at one of the specified ttl voltage levels, rather than 0 v or the associatedvccswitchingcharacteristicsoperating

26、characteristicspower-upconsiderations(1)sn74lvc4245aoctal bustransceiverand 3.3-vto5-vshifterwith 3-state outputsscas375h march1994revisedmarch2005over recommendedoperatingfree-air temperaturerange, cl= 50 pf (unless otherwisenoted) (see figure 1 and figure 2)vcca= 5 v 0.5 v,fromtovccb= 2.7 v to 3.6

27、 vparameterunit(input)(output)minmaxtphl16.3abnstplh16.7tphl16.1banstplh15tpzl19oeanstpzh18.1tpzl18.8oebnstpzh19.8tplz17oeanstphz15.8tplz17.7oebnstphz17.8vcca= 4.5 v to 5.5 v, vccb= 2.7 v to 3.6 v, ta= 25 cparametertest conditionstypunitoutputs enabled39.5cpdpower dissipation capacitance per transce

28、ivercl= 0,f = 10 mhzpfoutputs disabled5ti level-translationdevices offer an opportunityfor successful mixed-voltagesignal design. a proper power-upsequence always should be followed to avoid excessivesupply current, bus contention,oscillations,or otheranomalies caused by improperly biased device pin

29、s. take these precautionsto guard against such power-upproblems:1. connect ground before any supply voltage is applied.2. power up the control side of the device (vccafor all four of these devices).3. tie oe to vccawith a pullup resistor so that it ramps with vcca.4. depending on the direction of th

30、e data path, dir can be high or low. if dir high is needed (a data to b bus),ramp it with vcca. otherwise, keep dir low.(1)refer to the ti application report, texas instruments voltage-level-translationdevices, literature number sceaparametermeasurementinformationfrom outputunder testcl= 50 pf(see n

31、ote a)load circuits12 vccopengnd500 ?500 ?voltage waveformspropagation delay timesnoninverting outputstplhtphlvohvoloutputcontroloutputwaveform 1s1 at 2 vcc(see note b)outputwaveform 2s1 at gnd(see note b)volvohtpzltpzhtplztphz1.5 v1.5 vvcc0 vvol + 0.3 vvoh - 0.3 v 0 v3 vvoltage waveformsenable and

32、disable timeslow- and high-level enablingoutputtplh/tphltplz/tpzltphz/tpzhopen2 vccgndtests1notes:a.cl includes probe and jig capacitance.b.waveform 1 is for an output with internal conditions such that the output is low, except when disabled by the output control.waveform2 is for an output with int

33、ernal conditions such that the output is high, except when disabled by the output control.c.all input pulses are supplied by generators having the following characteristics: prr 10 mhz, zo = 50 ?, tr 2.5 ns, tf 2.5 ns.d.the outputs are measured one at a time, with one transition per measurement.e.al

34、l parameters and waveforms are not applicable to all devices.vcc0 v1.5 vinput50% vcc50% vcc50% vcc1.5 v50% vccvcc0 v1.5 v1.5 vtwinputvoltage waveformspulse durationsn74lvc4245aoctal bustransceiverand3.3-v to5-vshifterwith 3-state outputsscas375h march1994revisedmarch2005a portfigure1. load circuitan

35、d voltagewparametermeasurementinformationfrom outputunder testcl= 50 pf(see note a)load circuits17 vopengnd500 ?500 ?voltage waveformspropagation delay timesnoninverting outputstplhtphlvohvoloutputcontroloutputwaveform 1s1 at 7 v(see note b)outputwaveform 2s1 at gnd(see note b)volvohtpzltpzhtplztphz

36、1.5 v1.5 v3.5 v0 vvol + 0.3 vvoh - 0.3 v 0 v3 vvoltage waveformsenable and disable timeslow- and high-level enablingoutputtplh/tphltplz/tpzltphz/tpzhopen7 vgndtests1notes:a.cl includes probe and jig capacitance.b.waveform 1 is for an output with internal conditions such that the output is low, excep

37、t when disabled by the output control.waveform2 is for an output with internal conditions such that the output is high, except when disabled by the output control.c.all input pulses are supplied by generators having the following characteristics: prr 10 mhz, zo = 50 ?, tr 2.5 ns, tf 2.5 ns.d.the out

38、puts are measured one at a time, with one transition per measurement.e.all parameters and waveforms are not applicable to all devices.3 v0 v1.5 vinput1.5 v1.5 v1.5 v1.5 v1.5 v3 v0 v1.5 v1.5 vtwinputvoltage waveformspulse durationsn74lvc4245aoctal bustransceiverand 3.3-vto5-vshifterwith 3-state outpu

39、tsscas375h march1994revisedmarch2005b portfigure2. load circuitand voltagewaveforms7packaginginformationorderabledevicestatus(1)packagetypepackagedrawingpinspackageqtyeco plan(2)lead/ballfinishmsl peak temp(3)sn74lvc4245adbractivessopdb242000green (rohs &no sb/br)cu nipdaulevel-1-260c-unlimsn74l

40、vc4245adbre4activessopdb242000green (rohs &no sb/br)cu nipdaulevel-1-260c-unlimsn74lvc4245adbrg4activessopdb242000green (rohs &no sb/br)cu nipdaulevel-1-260c-unlimsn74lvc4245adwactivesoicdw2425green (rohs &no sb/br)cu nipdaulevel-1-260c-unlimsn74lvc4245adwe4activesoicdw2425green (rohs &a

41、mp;no sb/br)cu nipdaulevel-1-260c-unlimsn74lvc4245adwg4activesoicdw2425green (rohs &no sb/br)cu nipdaulevel-1-260c-unlimsn74lvc4245adwractivesoicdw242000green (rohs &no sb/br)cu nipdaulevel-1-260c-unlimsn74lvc4245adwre4activesoicdw242000green (rohs &no sb/br)cu nipdaulevel-1-260c-unlimsn

42、74lvc4245adwrg4activesoicdw242000green (rohs &no sb/br)cu nipdaulevel-1-260c-unlimsn74lvc4245apwactivetssoppw2460green (rohs &no sb/br)cu nipdaulevel-1-260c-unlimsn74lvc4245apwe4activetssoppw2460green (rohs &no sb/br)cu nipdaulevel-1-260c-unlimsn74lvc4245apwg4activetssoppw2460green (rohs

43、 &no sb/br)cu nipdaulevel-1-260c-unlimsn74lvc4245apwractivetssoppw242000green (rohs &no sb/br)cu nipdaulevel-1-260c-unlimsn74lvc4245apwre4activetssoppw242000green (rohs &no sb/br)cu nipdaulevel-1-260c-unlimsn74lvc4245apwrg4activetssoppw242000green (rohs &no sb/br)cu nipdaulevel-1-260

44、c-unlimsn74lvc4245apwtactivetssoppw24250green (rohs &no sb/br)cu nipdaulevel-1-260c-unlimsn74lvc4245apwte4activetssoppw24250green (rohs &no sb/br)cu nipdaulevel-1-260c-unlimsn74lvc4245apwtg4activetssoppw24250green (rohs &no sb/br)cu nipdaulevel-1-260c-unlim(1)the marketing status values

45、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 usin

46、g this part ina 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-friendlyclassification: pb-free (rohs), pb-free (rohs exempt), or green (rohs & no s

47、b/br) - please checkhttp:/ the latest availability information and additional product content details.tbd: the pb-free/green conversion plan has not been defined.pb-free(rohs): tis terms lead-free or pb-free mean semiconductorproducts that are compatiblewith the current rohs requirementsfor all 6 su

48、bstances, including the requirement that lead not exceed 0.1% by weight in homogeneousmaterials. where designed to be solderedat high temperatures,ti pb-free products are suitable for use in specified lead-free processes.pb-free(rohs exempt):this componenthas a rohs exemption for either 1) lead-base

49、dflip-chip solder bumps used between the die andpackageoption addendum18-sep-2008addendum-page1package,or 2) lead-baseddie adhesiveused betweenthe die and leadframe.the componentis otherwiseconsideredpb-free (rohscompatible) as defined above.green (rohs & no sb/br):ti defines green to mean pb-fr

50、ee (rohs compatible),and free of bromine (br) and antimony (sb) based flameretardants (br or sb do not exceed 0.1% by weight in homogeneous material)(3)msl, peak temp. - the moisturesensitivitylevel rating accordingto the jedec industry standardclassifications,and peak soldertemperature.importantinf

51、ormationand disclaimer:the informationprovided on this page represents tis knowledgeand belief as of the date that it isprovided.ti bases its knowledgeand belief on informationprovided by third parties, and makes no representationor warranty as to theaccuracyof such information.efforts are underwayt

52、o better integrateinformationfrom third parties. ti has taken and continuesto takereasonablesteps to provide representativeand accurate informationbut may not have conducted destructive testing or chemical analysis onincoming materials and chemicals. ti and ti suppliers consider certain information

53、to be proprietary, and thus cas numbers and other limitedinformation may not be available for release.in no event shall tis liability arising out of such information exceed the total purchase price of the ti part(s) at issue in this document sold by tito customer on an annual basis.other qualified v

54、ersions of sn74lvc4245a:?enhanced product: sn74lvc4245a-epnote: qualified version definitions:?enhanced product - supports defense, aerospace and medical applicationspackageoption addendum18-sep-2008addendum-page2tape and reel information*all dimensions are nominaldevicepackagetypepackagedrawingpins

55、spqreeldiameter(mm)reelwidthw1 (mm)a0 (mm)b0 (mm)k0 (mm)p1(mm)w(mm)pin1quadrantsn74lvc4245adbrssopdb242000330.02.512.016.0q1sn74lvc4245adwrsoicdw242000330.024.410.7515.72.712.024.0q1sn74lvc4245apwrtssoppw242000330.016.46.916.0q1packagematerialsinformation11-mar-2008pack materials

56、-page1*all dimensions are nominaldevicepackage typepackage drawingpinsspqlength (mm)width (mm)height (mm)sn74lvc4245adbrssopdb242000346.0346.033.0sn74lvc4245adwrsoicdw242000346.0346.041.0sn74lvc4245apwrtssoppw242000346.0346.033.0packagematerialsinformation11-mar-2008pack materials-page2mechanical da

57、tamsso002e january 1995 revised december 2001post office box 655303 ? dallas, texas 75265db (r-pdso-g*) plastic small-outline4040065 /e 12/0128 pins showngage plane8,207,400,550,950,253812,9012,302810,50248,50seating plane9,907,903010,509,900,385,605,00150,2214a28120166,506,50140,05 min5,905,90dima

58、maxa minpins *2,00 max6,907,500,65m0,150 80,100,090,25notes:a.all linear dimensions are in millimeters.b.this drawing is subject to change without notice.c.body dimensions do not include mold flash or protrusion not to exceed 0,15.d.falls within jedec mo-150 mechanical data mtss001c january 1995 rev

59、ised february 1999post office box 655303 ? dallas, texas 75265pw (r-pdso-g*) plastic small-outline package14 pins shown0,65m0,100,100,250,500,750,15 nomgage plane289,809,60247,907,7020166,606,404040064/f 01/970,306,606,2080,194,304,5070,1514a11,20 max145,104,9083,102,90a maxa mindimpins *0,054,905,1

60、0seating plane0 8notes:a.all linear dimensions are in millimeters.b.this drawing is subject to change without notice.c.body dimensions do not include mold flash or protrusion not to exceed 0,15.d.falls within jedec mo-153important noticetexas instruments incorporated and its subsidiaries (ti) reserve the right to make corrections, modifications,enhancements,improvements