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74HC595:8ChannelShiftRegisterwith3StateOutputforHighSpeedDigitalLogic
TableofContents
1.Overview
2.Features
3.Applications
4.PinConfiguration
5.FunctionalDescription
6.TruthTable
7.TimingDiagrams
8.AbsoluteMaximumRatings
9.ElectricalCharacteristics
10.PackageInformation
1.Overview
2.Features
8bitserialinputandoutput
3stateoutputsforbusorientedapplications
Cascadableforlongershiftregisters
Highspeedoperation
Lowpowerconsumption
Availableinawiderangeofpackages
3.Applications
Serialtoparalleldataconversion
Shiftregisteroperations
Storageregisterfunctions
LEDandLCDdisplaydrivers
Generalpurposelogicapplications
Microprocessorperipheralcontrol
4.PinConfiguration
The74HC595hasa16pinDIP/SOPpackagewiththefollowingpinconfiguration:
1.Q0OutputBit0
2.Q1OutputBit1
3.Q2OutputBit2
4.Q3OutputBit3
5.Q4OutputBit4
6.Q5OutputBit5
7.Q6OutputBit6
8.Q7OutputBit7
9.MRMasterReset(ActiveLow)
10.SH_CPShiftRegisterClockInput
11.ST_CPStorageRegisterClockInput
12.OEOutputEnable(ActiveLow)
13.DSSerialDataInput
14.Q7'CascadingOutput(SerialOutput)
15.VCCPositiveSupplyVoltage
16.GNDGround
5.FunctionalDescription
The74HC595operatesshiftingdataintotheshiftregisterandthentransferringittothestorageregister.The3stateoutputscanbeenabledordisabledasneeded.Thedevicecanbecascadedtocreatelongershiftregisters.Here'sabriefdescriptionofitsoperation:
DataisshiftedintotheshiftregisterontherisingedgeoftheSH_CPclockinput.
ThedataintheshiftregisteristransferredtothestorageregisterontherisingedgeoftheST_CPclockinput.
TheoutputsareenabledwhenOEislowanddisabledwhenOEishigh.
TheMRinputresetstheshiftregisterandstorageregistertoallzeroswhenlow.
TheDSinputistheserialdatainputfortheshiftregister.
TheQ7'outputallowscascadingofmultiple74HC595devicesforlongershiftregisters.
6.TruthTable
Tobetterunderstandthebehaviorofthe74HC595,thefollowingtruthtableoutlinestheoperationofthedevicebasedontheinputconditions:
|MR|OE|SH_CP|ST_CP|DS|Q0|Q1|Q2|Q3|Q4|Q5|Q6|Q7|Q7'|
|||||||||||||||
|H|H|X|X|X|H|H|H|H|H|H|H|H|H|
|H|L|X|X|X|Q0|Q1|Q2|Q3|Q4|Q5|Q6|Q7|Q7|
|L|X|X|X|X|L|L|L|L|L|L|L|L|L|
|H|L|↑|X|L|Q0|Q1|Q2|Q3|Q4|Q5|Q6|Q7|L|
|H|L|X|↑|X|Q0'|Q1'|Q2'|Q3'|Q4'|Q5'|Q6'|Q7'|Q7'|
Note:'H'representsahighlogiclevel,'L'representsalowlogiclevel,'X'indicatestheinputisirrelevant,'↑'indicatesapositiveedge,and'Qx'and'Qx''representthepreviousandnewstatesoftheoutputs,respectively.
7.TimingDiagrams
Thetimingdiagramsforthe74HC595illustratetherelationshipbetweentheclockinputsandthedataflowthroughthedevice.Propertimingiscrucialforthedevicetofunctioncorrectly.
ShiftRegisterClock(SH_CP):ThedataatDSisloadedintotheshiftregisterontherisingedgeofSH_CP.
StorageRegisterClock(ST_CP):ThedatafromtheshiftregisteristransferredtothestorageregisterontherisingedgeofST_CP.
OutputEnable(OE):TheoutputsareenabledwhenOEislowanddisabledwhenOEishigh,regardlessoftheclocksignals.
8.AbsoluteMaximumRatings
Exceedingthesemaximumratingscancausepermanentdamagetothedevice.Theseratingsarestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthisspecificationisnotimplied.
SupplyVoltage(VCC):0.5Vto+7V
InputVoltage(VIN):0.5VtoVCC+0.5V
OutputVoltage(VOUT):0.5VtoVCC+0.5V
OperatingTemperature:40°Cto+125°C
StorageTemperature:65°Cto+150°C
OutputCurrent(IOUT):±35mA
PowerDissipation(PD):500mW
9.ElectricalCharacteristics
Thefollowingelectricalcharacteristicsareguaranteedunderthespecifiedoperatingconditions:
SupplyVoltage(VCC):2Vto6V
InputHighVoltage(VIH):VCC0.3V
InputLowVoltage(VIL):0.3V
OutputHighVoltage(VOH):VCC0.3V(IOH=6mA)
OutputLowVoltage(VOL):0.3V(IOL=6mA)
InputLeakageCurrent(IIN):±1μA
OutputLeakageCurrent(IOUT):±1μA
propagationDelay(tpd):50ns(VCC=5V)
10.PackageInformation
The74HC595isavailableinvariouspackages,includingthepopular16pinDualInlinePackage(DIP)andSmallOutlinePackage(SOP).Thepackagedimensionsandpinoutareasfollows:
DIPPackage:600milwidth,300milpitch
SOPPackage:150milwidth,300milpitch
Ensurethatthepackagechosenissuitablefortheapplicationandthatproperthermalmanagementisconsideredforhighpowerorhightemperatureenvironments.
11.OrderingInformation
74HC595N:DIPpackage
74HC595D:SOPpackage
74HC595PW:TSSOPpackage
74HC595M:SOICpackage
Makesuretocheckwithyoursupplierforavailabilityandanyadditionalpackageoptionsthatmaybeoffered.
12.HandlingPrecautions
Toensurethereliabilityandperformanceofthe74HC595,pleaseadheretothefollowinghandlingprecautions:
Avoidstaticdischargeusingantistaticwriststrapsandworkingonstaticsafesurfaces.
Donotexposethedevicetomoistureorcorrosivegases.
Handlethedeviceitsedgestopreventdamagetothepins.
Donotbendthepinsexcessivelywheninsertingorremovingthedevicefromasocket.
Useappropriatesolderingtechniquesandtemperaturestopreventheatdamage.
13.MountingConsiderations
Propermountingiscrucialforthe74HC595tofunctionoptimally.Herearesomeconsiderationsformountingthedevice:
EnsurethatthePCBtracesaredesignedtohandletheexpectedcurrentandthattheydonotexceedthemaximumoutputcurrentratings.
KeeptheVCCandGNDtracesasshortaspossibletominimizenoiseandinductance.
UsedecouplingcapacitorsclosetotheVCCandGNDpinstostabilizethepowersupplyandreduceelectricalnoise.
Ifusingasocket,ensureitisthecorrecttypeforthepackageandthatitissecurelymountedtothePCB.
14.TypicalApplications
The74HC595findsitswayintoamultitudeofapplicationsduetoitsversatility.Herearesometypicalusecases:
LEDMatrixControl:Drivean8x8LEDmatrixoraseriesofLEDdisplaysusingmultiple74HC595stocontroltherowsandcolumns.
LCDSegmentDrivers:DrivethesegmentlinesofLCDdisplayswiththe74HC595,allowingfordynamicdisplayupdates.
ShiftRegisterExpansion:ExpandtheI/Ocapabilitiesofmicrocontrollerscascadingmultiple74HC595stocontrolalargenumberofoutputswithjustafewmicrocontrollerpins.
DigitalClock:Buildadigitalclockusingthe74HC595todrivethedigitsofasevensegmentdisplay.
15.Troubleshooting
Ifyouencounterissueswiththe74HC595,con
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