Rev. 1.80 1 January 16, 2014 Rev. 1.82 PB January 16, 2014

HT24LC08CMOS 8K 2-Wire Serial EEPROM

Features• Operatingvoltage:1.8V~5.5Vfortemperature-40°Cto+85°C

• Lowpowerconsumption– Operation:5mAmax.– Standby:3μAmax.

• Internalorganization:1024×8• 2-wireserialinterface• Writecycletime:5msmax.• Automaticerase-before-writeoperation• Partialpagewriteallowed• 16-bytePageWriteMode• Writeoperationwithbuilt-intimer• Hardwarecontrolledwriteprotection• 40-yeardataretention• 106rewritecyclesperword• 8-pinDIP/SOP/TSSOPpackage

General DescriptionTheHT24LC08 is a8K-bit serial read/writenon-volatilememorydeviceusingtheCMOSfloatinggateprocess.Its8192bitsofmemoryareorganizedinto1024wordsandeachword is8bits.Thedevice isoptimizedforuseinmanyindustrialandcommercialapplicationswhere low power and low voltageoperationareessential.UptotwoHT24LC08devicesmaybeconnected to the same two-wirebus.TheHT24LC08isguaranteedfor1Merase/writecyclesand40-yeardataretention.

Block Diagram

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Pin Assignment

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Pin DescriptionPin Name I/O DescriptionA0~A2 I Address inputs. A0, A1 not connected.SDA I/O Serial dataSCL I Serial clock inputWP I Write protectVSS — Negative power supply, groundVCC — Positive power supply

Rev. 1.80 2 January 16, 2014

HT24LC08

Absolute Maximum RatingsSupplyVoltage.........................VSS−0.3VtoVSS+6.0VInputVoltage............................ VSS−0.3VtoVCC+0.3V

StorageTemperature...........................−50°Cto125°COperatingTemperature.........................−40°Cto85°C

Note:Thesearestressratingsonly.Stressesexceedingtherangespecifiedunder″AbsoluteMaximumRatings″maycausesubstantialdamagetothedevice.Functionaloperationofthisdeviceatotherconditionsbeyondthoselistedin thespecificationisnot impliedandprolongedexposuretoextremeconditionsmayaffectdevicereliability.

D.C. CharacteristicsTa=-40°C~+85°C

Symbol ParameterTest Conditions

Min. Typ. Max. UnitVCC Conditions

VCC Operating Voltage — -40°C to +85°C 1.8 — 5.5 VICC1 Operating Current 5V Read at 400kHz — — 2 mAICC2 Operating Current 5V Write at 400kHz — — 5 mAVIL Input Low Voltage — — -0.45 — 0.3VCC VVIH Input High Voltage — — 0.7VCC — VCC+0.5 V

VOL Output Low Voltage2.4V IOL=2.1mA — — 0.4 V1.8V IOL=0.7mA — — 0.2 V

ILI Input Leakage Current 5V VIN=0 or VCC — — 1 μAILO Output Leakage Current 5V VOUT=0 or VCC — — 1 μA

ISTB Standby Current

5VVIN=0 or VCC — — 3 μASDA, SCL=VCCA2, WP=VSS — — 1 μA

1.8VVIN=0 or VCC — — 2 μASDA, SCL=VCCA2, WP=VSS — — 1 μA

CIN Input Capacitance (See Note) — f=1MHz, 25°C — — 6 pFCOUT Output Capacitance (See Note) — f=1MHz, 25°C — — 8 pF

Note:Theseparametersareperiodicallysampledbutnot100%tested.

Rev. 1.80 3 January 16, 2014

HT24LC08

A.C. CharacteristicsTa=-40°C~+85°C

Symbol Parameter RemarkVCC=1.8V~5.0V VCC=2.5V~5.0V

UnitMin. Max. Min. Max.

fSK Clock Frequency — — 400 — 1000 kHztHIGH Clock High Time — 600 — 400 — nstLOW Clock Low Time — 1200 — 600 — nstr SDA and SCL Rise Time Note — 300 — 300 nstf SDA and SCL Fall Time Note — 300 — 300 ns

tHD:STA START Condition Hold Time After this period the first clock pulse is generated 600 — 250 — ns

tSU:STA START Condition Setup Time Only relevant for repeated START condition 600 — 250 — ns

tHD:DAT Data Input Hold Time — 0 — 0 — nstSU:DAT Data Input Setup Time — 150 — 100 — nstSU:STO STOP Condition Setup Time — 600 — 250 — nstAA Output Valid from Clock — — 900 — 600 ns

tBUF Bus Free Time Time in which the bus must be free before a new transmission can start 1200 — 500 — ns

tSPInput Filter Time Constant(SDA and SCL Pins) Noise suppression time — 50 — 50 ns

tWR Write Cycle Time — — 5 — 5 ms

Endurance 25°C, Page Mode 5.0V 1,000,000 Write Cycles

Note:Theseparametersareperiodicallysampledbutnot100%tested.Forrelativetiming,refertotimingdiagrams.

Rev. 1.80 4 January 16, 2014

HT24LC08

Functional Description• Serialclock–SCLTheSCL input isused forpositive edgeclockdataintoeachEEPROMdeviceandnegativeedgeclockdataoutofeachdevice.

• Serialdata–SDAThe SDA pin is bidirectional for serial datatransfer.Thepinisopen-draindrivenandmaybewired-ORwithanynumberofotheropen-drainoropencollectordevices.

• AddressInputs–A0,A1,A2TheHT24LC08uses theA2 input forhardwireaddressingandatotalof two8Kdevicesmaybeaddressedonasinglebussystem.TheA0andA1pinshavenointernalconnection.ThecodefortheselecteddeviceissetupbyconnectingtheA2inputtoeitherVSSorVCC.IfA2isleftunconnectedinafloatingstatetheA2inputwillbeinternallyreadashavingalowinput,VSS,value.

• Writeprotect–WPTheHT24LC08 has awrite protect pin thatprovides hardware data protection.Thewriteprotectpinallowsnormal read/writeoperationswhenconnectedtoVSSorleftfloating.Whenthewriteprotectpin isconnected toVCC, thewriteprotectionfeatureisenabledandoperatesasshowninthefollowingtable.

WP Pin Status Protect ArrayVCC Full Array (8K)VSS or floating Normal Read/Write Operations

Memory OrganizationInternallyorganizedwith10248-bitwords, the8Krequiresa10-bitdatawordaddressforrandomwordaddressing.

Device Operations• ClockanddatatransitionDatatransfermaybeinitiatedonlywhenthebusisnotbusy.Duringdatatransfer, thedatalinemustremain stablewhenever theclock line ishigh.Changes indata linewhile theclockline ishighwillbeinterpretedasaSTARTorSTOPcondition.

• StartconditionAhigh-to-lowtransitionofSDAwithSCLhighisastartconditionwhichmustprecedeanyothercommand (refer to Start andStopDefinitionTimingdiagram).

• StopconditionAlow-to-hightransitionofSDAwithSCLhighisastopcondition.Afterareadsequence, thestopcommandwillplace theEEPROMinastandbypowermode (refer toStartandStopDefinitionTimingDiagram).

• AcknowledgeAll addresses and data words are seriallytransmitted to and from theEEPROM in8-bitwords.TheEEPROMsendsazerotoacknowledgethatithasreceivedeachword.Thishappensduringtheninthclockcycle.

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Device AddressingThe8KEEPROMdevice requiresan8-bitdeviceaddresswordfollowingastartconditiontoenablethechipforareadorwriteoperation.Thedeviceaddresswordconsistofamandatoryone,zerosequenceforthefirstfourmostsignificantbits(refertothediagramshowingtheDeviceAddress).ThisiscommontoalltheEEPROMdevice.

The8KEEPROMusestheA2deviceaddressbitwiththenexttwobitsformemorypageaddressing.TheA2bitmustcompareitscorrespondinghardwiredinputpin.TheA1andA0pinshavenoconnection.

Thesepageaddressingbitsonthe8Kdeviceshouldbeconsidered themost significantbitsof thedatawordaddresswhich follows.TheA0andA1pinshavenoconnection.

The8thbitdeviceaddressistheread/writeoperationselectbit.Areadoperation is initiated if thisbit ishighandawriteoperationisinitiatedifthisbitislow.

If thecomparisonof thedeviceaddresssucceedtheEEPROMwilloutputazeroatACKbit. Ifnot, thechipwillreturntoastandbystate.

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Rev. 1.80 5 January 16, 2014

HT24LC08

Write Operations• BytewriteAwrite operation requires an8-bit datawordaddress following thedeviceaddresswordandacknowledgment.Upon receiptof thisaddress,theEEPROMwill again respondwith a zeroand thenclock in thefirst8-bitdataword.Afterreceivingthe8-bitdataword, theEEPROMwilloutputazeroandtheaddressingdevice,suchasamicrocontroller,mustterminatethewritesequencewithastopcondition.At this timetheEEPROMentersaninternally-timedwritecycle tothenon-volatilememory.AllinputsaredisabledduringthiswritecycleandEEPROMwillnot responduntilthewriteiscompleted(refertoBytewritetiming).

• PagewriteThe8KEEPROMiscapableofa16-bytepagewrite.Apagewriteisinitiatedinthesamewayasabytewrite,butthemicrocontrollerdoesnotsendastopconditionafterthefirstdatawordisclockedin.Instead,after theEEPROMacknowledgesthereceiptof thefirstdataword, themicrocontrollercan transmit up to 15more datawords.TheEEPROMwillrespondwithazeroaftereachdatawordreceived.Themicrocontrollermustterminatethepagewritesequencewithastopcondition(refertoPagewritetiming).Thedatawordaddresslowerfourbitsareinternallyincremented following the receiptof eachdataword.Thehigherdatawordaddressbitsarenotincremented, retaining thememory page rowlocation.

• AcknowledgepollingTomaximisebusthroughput,onetechniqueis toallowthemastertopollforanacknowledgesignalafter thestartconditionand thecontrolbyte forawritecommandhavebeensent.If thedeviceisstillbusy implementing itswritecycle, thennoACKwillbe returned.Themastercansend thenext read/writecommandwhen theACKsignalhasfinallybeenreceived.

• WriteprotectTheHT24LC08hasawrite-protect functionandprogrammingwill thenbeinhibitedwhentheWPpin isconnected toVCC.Under thismode, theHT24LC08isusedasaserialROM.

• ReadoperationsTheHT24LC08supports three readoperations,namely, current address read, randomaddressreadandsequential read.Duringreadoperationexecution,theread/writeselectbitshouldbesetto"1".

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Acknowledge Polling Flow

• CurrentaddressreadTheinternaldatawordaddresscountermaintainsthe lastaddressaccessedduring the last readorwriteoperation,incrementedbyone.Thisaddressstaysvalidbetweenoperationsaslongasthechippowerismaintained.Theaddressrolloverduringreadfromthelastbyteofthelastmemorypagetothefirstbyteofthefirstpage.Theaddressrolloverduringwritefromthelastbyteofthecurrentpagetothefirstbyteofthesamepage.Oncethedeviceaddresswiththeread/writeselectbitsettooneisclocked inandacknowledgedby theEEPROM,thecurrentaddressdataword isseriallyclockedout.Themicrocontrollershouldrespondwitha"noACK"signal(high)followedbyastopcondition(refertoCurrentreadtiming).

• RandomreadA random read requires a dummybytewritesequenceto loadin thedatawordaddresswhichis then clocked in and acknowledged by theEEPROM.Themicrocontrollermustthengenerateanother start condition.Themicrocontrollernow initiatesacurrentaddress readbysendingadeviceaddresswith the read/write selectbithigh.TheEEPROMacknowledges thedeviceaddressandseriallyclocksoutthedataword.Themicrocontrollershouldrespondwitha"noACK"signal(high)followedbyastopcondition.(refertoRandomreadtiming).

Rev. 1.80 6 January 16, 2014

HT24LC08

• SequentialreadSequential readsare initiatedbyeitheracurrentaddressreadorarandomaddressread.After themicrocontrollerreceivesadataword, it respondswithanacknowledgment.AslongastheEEPROMreceivesanacknowledgment, itwillcontinue toincrementthedatawordaddressandseriallyclock

out sequential datawords.When thememoryaddresslimitisreached,thedatawordaddresswillrolloverand thesequential readcontinues.Thesequential readoperation is terminatedwhenthemicrocontrollerrespondswitha"noACK"signal(high)followedbyastopcondition.

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Byte Write Timing

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Page Write Timing

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Current Read Timing

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Random Read Timing

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Sequential Read Timing

Rev. 1.80 7 January 16, 2014

HT24LC08

Timing Diagrams

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Note:ThewritecycletimetWRisthetimefromavalidstopconditionofawritesequencetotheendofthevalidstartconditionofsequentialcommand.

Rev. 1.80 8 January 16, 2014

HT24LC08

Package InformationNotethat thepackageinformationprovidedhereisforconsultationpurposesonly.Asthis informationmaybeupdatedatregularintervalsusersareremindedtoconsulttheHoltekwebsiteforthelatestversionofthepackageinformation.

Additionalsupplementaryinformationwithregardtopackagingislistedbelow.Clickontherelevantsectiontobetransferredtotherelevantwebsitepage.

• FurtherPackageInformation(includeOutlineDimensions,ProductTapeandReelSpecifications)

• PackingMeterialsInformation

• Cartoninformation

Rev. 1.80 9 January 16, 2014

HT24LC08

8-pin DIP (300mil) Outline Dimensions

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SymbolDimensions in inch

Min. Nom. Max.A 0.355 0.365 0.400B 0.240 0.250 0.280C 0.115 0.130 0.195 D 0.115 0.130 0.150 E 0.014 0.018 0.022 F 0.045 0.060 0.070G — 0.100 BSC —H 0.300 0.310 0.325 I — — 0.430

SymbolDimensions in mm

Min. Nom. Max.A 9.02 9.27 10.16 B 6.10 6.35 7.11 C 2.92 3.30 4.95 D 2.92 3.30 3.81 E 0.36 0.46 0.56 F 1.14 1.52 1.78G — 2.54 BSC —H 7.26 7.87 8.26I — — 10.92

Rev. 1.80 10 January 16, 2014

HT24LC08

8-pin SOP (150mil) Outline Dimensions

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SymbolDimensions in inch

Min. Nom. Max.A — 0.236 BSC —B — 0.154 BSC —C 0.012 — 0.020C′ — 0.193 BSC —D — — 0.069E — 0.050 BSC —F 0.004 — 0.010G 0.016 — 0.050H 0.004 — 0.010α 0° — 8°

SymbolDimensions in mm

Min. Nom. Max.A —F 6.00 BSC —B — 3.90 BSC —C 0.31 — 0.51C′ — 4.90 BSC —D — — 1.75E — 1.27 BSC —F 0.10 — 0.25G 0.40 — 1.27H 0.10 — 0.25α 0° — 8°

Rev. 1.80 11 January 16, 2014

HT24LC08

8-pin TSSOP Outline Dimensions

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SymbolDimensions in inch

Min. Nom. Max.A — — 0.047

A1 0.002 — 0.006 A2 0.031 0.039 0.041 B 0.007 — 0.012 C 0.004 — 0.006 D 0.114 0.118 0.122 E — 0.252 BSC —

E1 0.169 0.173 0.177 e — 0.026 BSC —L 0.018 0.024 0.030

L1 — 0.039 BSC —y — 0.004 —θ 0° — 8°

SymbolDimensions in mm

Min. Nom. Max.A — — 1.20

A1 0.05 — 0.15 A2 0.80 1 1.05 B 0.19 — 0.30 C 0.09 — 0.16 D 2.90 3.00 3.10E — 6.40 BSC —

E1 4.30 4.40 4.50 e — 0.65 BSC —L 0.45 0.60 0.75

L1 — 1.0 BSC —y — 0.10 —θ 0° — 8°

Rev. 1.80 12 January 16, 2014

HT24LC08

Copyright© 2014 by HOLTEK SEMICONDUCTOR INC.

The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holtek's products are not authorized for use as critical components in life support devices or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.