8ĆBit Addressable Latch
The MC74AC259/74ACT259 is a high-speed 8-bit addressable latch designed for general purpose storage applications in digital systems. It is a multifunctional device capable of storing single line data in eight addressable latches, and also a 1-of-8 decoder and demultiplexer with active HIGH outputs. The device also incorporates an active LOW Common Clear for resetting all latches, as well as an active LOW Enable. It is functionally identical to the ALS259 8-bit addressable latch.••••••
Serial-to-Parallel Conversion
Eight Bits of Storage with Output of Each Bit AvailableRandom (Addressable) Data Entry
Active High Demultiplexing or Decoding CapabilityEasily ExpandableCommon Clear
FUNCTIONAL DESCRIPTION
The MC74AC259/74ACT259 has four modes of operation as shown in the Mode Selection Table. In the addressable latch mode, data on the Data line (D) is written into the addressed latch. The addressed latch will follow the data input with all non-addressed latches remaining in their previous states in the memory mode. All latches remain in their previous state and are unaffected by the Data or Address inputs.In the one-of-eight decoding or demultiplexing mode, the addressed output will follow the state of the D input with all other outputs in the LOW state. In the clear mode all outputs are LOW and unaffected by the address and data inputs. When operating the MC74AC/ACT259 as an addressable latch, changing more than one bit of the address could impose a transient wrong address. Therefore, this should only be done while in the memory mode. The Mode Select Function Tablesummarizes the operations of the MC74AC/ACT259.
FACT DATA
5-1
元器件交易网www.cecb2b.comMC74AC259 MC74ACT259MODE SELECT TABLEELHLHMRHHLLModeAddressable LatchMemoryActive HIGH 8-Channel DemultiplexerClearH = HIGH Voltage LevelL = LOW Voltage LevelMODE SELECT-FUNCTION TABLEOperatingModeMaster ResetInputsMRLLLL•••LHHHH•••HEHLLL•••LHLLL•••LDXddd•••dXddd•••dA0XLHL•••HXLHL•••HA1XLLH•••HXLLH•••HA2XLLL•••HXLLL•••HQ0LQ = dLL•••Lq0Q = dq0q0•••q0Q1LLQ = dL•••Lq1q1Q = dq1•••q1Q2LLLQ = d•••Lq2q2q2Q = d•••q2OutputsQ3LLLL•••Lq3q3q3q3•••q3Q4LLLL•••Lq4q4q4q4•••q4Q5LLLL•••Lq5q5q5q5•••q5Q6LLLL•••Lq6q6q6q6•••q6Q7LLLL•••Q = dq7q7q7q7•••Q = dDemultiplex(Active HIGHDecoder whenD = H)Store(Do Nothing)AddressableLatchH = HIGH Voltage LevelL = LOW Voltage LevelX = Immateriald = HIGH or LOW Data one setup time prior to the LOW-to-HIGH Enable transitionq = Lower case letters indicate the state of the referenced output established during the last cycle in which it was addressed or cleared.FACT DATA5-2元器件交易网www.cecb2b.comMC74AC259 MC74ACT259Q7Q6Q5MRQ4A2A1Q3A0Q2Q1DEQ0Please note that this diagram is provided only for the understanding of logicoperations and should not be used to estimate propagation delays.FACT DATA5-3元器件交易网www.cecb2b.comMC74AC259 MC74ACT259MAXIMUM RATINGS*SymbolVCCVinVoutIinIoutICCTstgParameterDC Supply Voltage (Referenced to GND)DC Input Voltage (Referenced to GND)DC Output Voltage (Referenced to GND)DC Input Current, per PinDC Output Sink/Source Current, per PinDC VCC or GND Current per Output PinStorage TemperatureValue–0.5 to +7.0–0.5 to VCC +0.5–0.5 to VCC +0.5±20±50±50–65 to +150UnitVVVmAmAmA°C*Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the RecommendedOperating Conditions.RECOMMENDED OPERATING CONDITIONS SymbolVCCVin, VoutSupply VoltageDC Input Voltage, Output Voltage (Ref. to GND)Input Rise and Fall Time (Note 1)′AC Devices except Schmitt InputsInput Rise and Fall Time (Note 2)′ACT Devices except Schmitt InputsJunction Temperature (PDIP)Operating Ambient Temperature RangeOutput Current — HighOutput Current — Low–4025VCC @ 3.0 VVCC @ 4.5 VVCC @ 5.5 Vtr, tfTJTAIOHIOLVCC @ 4.5 VVCC @ 5.5 VParameter′AC′ACTMin2.04.501504025108.014085–2424ns/V°C°CmAmAns/VTyp5.05.0Max6.05.5VCCUnitVVtr, tf1. Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times.2. Vin from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.FACT DATA5-4元器件交易网www.cecb2b.comMC74AC259 MC74ACT259DC CHARACTERISTICS 74ACSymbol ParameterVCC(V) TA = +25°CTypVIHMinimum High LevelInput VoltageMaximum Low LevelInput VoltageMinimum High LevelOutput Voltage3.04.55.53.04.55.53.04.55.53.04.55.5VOLMaximum Low LevelOutput Voltage3.04.55.53.04.55.5IINIOLDIOHDICCMaximum InputLeakage Current†Minimum DynamicOutput CurrentMaximum QuiescentSupply Current5.55.55.55.58.00.0020.0010.0011.52.252.751.52.252.752.994.495.4974ACTA =–40°C to +85°CUnitConditionsGuaranteed Limits2.13.153.850.91.351.652.94.45.42.563.864.860.10.10.10.360.360.36±0.12.13.153.850.91.351.652.94.45.42.463.764.760.10.10.10.440.440.44±1.075–7580VVOUT = 0.1 Vor VCC – 0.1 VVOUT = 0.1 Vor VCC – 0.1 VIOUT = –50 µAV*VIN = VIL or VIH–12 mAIOH–24 mA–24 mAIOUT = 50 µAV*VIN = VIL or VIH12 mAIOL24 mA24 mAVI = VCC, GNDVOLD = 1.65 V MaxVOHD = 3.85 V MinVIN = VCC or GNDVILVVOHVVµAmAmAµA*All outputs loaded; thresholds on input associated with output under test.†Maximum test duration 2.0 ms, one output loaded at a time.Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC.FACT DATA5-5元器件交易网www.cecb2b.comMC74AC259 MC74ACT259AC CHARACTERISTICS (For Figures and Waveforms — See Section 3) 74ACSymbolParameterVCC*(V)MintPLHtPHLtPLHtPHLtPLHtPHLtPHLPropagation DelayDn to QnPropagation DelayDn to QnPropagation DelayE to QnPropagation DelayE to QnPropagation DelayAddress to QnPropagation DelayAddress to QnPropagation DelayMR to Q3.35.03.35.03.35.03.35.03.35.03.35.03.35.02.02.02.02.02.02.02.02.02.02.02.02.02.02.0TA = +25°CCL = 50 pFTyp9.06.59.06.010.57.08.07.512.08.010.07.08.06.0Max14.510.013.59.515.010.512.59.019.013.016.011.012.09.074ACTA = –40°Cto +85°CCL = 50 pFMin1.51.51.51.51.51.51.51.51.51.51.51.51.51.5Max17.011.516.011.017.512.515.011.022.515.519.013.013.510.0nsnsnsnsnsnsns3-53-53-63-63-63-63-7UnitFig.No.*Voltage Range 3.3 V is 3.3 V ±0.3 V.Voltage Range 5.0 V is 5.0 V ±0.5 V.AC OPERATING REQUIREMENTS 74ACSymbolParameterVCC*(V)TyptsthtsthtwtwSetup Time, HIGH or LOWDn to EHold Time, HIGH or LOWDn to ESetup TimeAddress to EHold TimeAddress to EMinimum PulseWidth MRMinimum PulseWidth E3.35.03.35.03.35.03.35.03.35.03.35.0TA = +25°CCL = 50 pF74ACTA = –40°Cto +85°CCL = 50 pFUnitFig.No.Guaranteed Minimum3.52.52.52.07.04.02.02.06.05.56.55.54.53.52.52.09.06.02.02.06.56.07.06.0nsnsnsnsnsns3-93-93-63-63-63-6*Voltage Range 3.3 V is 3.3 V ±0.3 V.Voltage Range 5.0 V is 5.0 V ±0.5 V.FACT DATA5-6元器件交易网www.cecb2b.comMC74AC259 MC74ACT259DC CHARACTERISTICS 74ACTSymbol ParameterVCC(V) TA = +25°CTypVIHVILVOHMinimum High LevelInput VoltageMaximum Low LevelInput VoltageMinimum High LevelOutput Voltage4.55.54.55.54.55.54.55.5VOLMaximum Low LevelOutput Voltage4.55.54.55.5IIN∆ICCTIOLDIOHDICCMaximum InputLeakage CurrentAdditional Max. ICC/Input†Minimum DynamicOutput CurrentMaximum QuiescentSupply Current5.55.55.55.55.58.00.60.0010.0011.51.51.51.54.495.4974ACTTA =–40°C to +85°CUnitConditionsGuaranteed Limits2.02.00.80.84.45.43.864.860.10.10.360.36±0.12.02.00.80.84.45.43.764.760.10.10.440.44±1.01.575–7580VVVVOUT = 0.1 Vor VCC – 0.1 VVOUT = 0.1 Vor VCC – 0.1 VIOUT = –50 µA*VIN = VIL or VIH–24 mAIOH–24 mAIOUT = 50 µA*VIN = VIL or VIH24 mAIOL24 mAVI = VCC, GNDVI = VCC –2.1 VVOLD = 1.65 V MaxVOHD = 3.85 V MinVIN = VCC or GNDVVVµAmAmAmAµA*All outputs loaded; thresholds on input associated with output under test.†Maximum test duration 2.0 ms, one output loaded at a time.FACT DATA5-7元器件交易网www.cecb2b.comMC74AC259 MC74ACT259AC CHARACTERISTICS (For Figures and Waveforms — See Section 3) 74ACTSymbolParameterVCC*(V)MintPLHtPHLtPLHtPHLtPLHtPHLtPHLPropagation DelayDn to QnPropagation DelayDn or QnPropagation DelayE to QnPropagation DelayE or QnPropagation DelayAddress to QnPropagation DelayAddress to QnPropagation DelayMR to Q5.05.05.05.05.05.05.02.02.02.02.02.02.02.0TA = +25°CCL = 50 pFTyp6.57.010.59.08.06.0Max11.010.514.012.011.510.010.074ACTTA = –40°Cto +85°CCL = 50 pFMin1.51.51.51.51.51.51.5Max12.512.016.514.013.512.011.0nsnsnsnsnsnsns3-53-53-63-63-63-63-7UnitFig.No.*Voltage Range 5.0 V is 5.0 V ±0.5 V.AC OPERATING REQUIREMENTS 74ACTSymbolParameterVCC*(V)TyptsthtsthtwtwSetup Time, HIGH or LOWDn to EHold Time, HIGH or LOWDn to ESetup TimeAddress to EHold TimeAddress to EMinimum PulseWidth MRMinimum PulseWidth E5.05.05.05.05.05.0TA = +25°CCL = 50 pF74ACTTA = –40°Cto +85°CCL = 50 pFUnitFig.No.Guaranteed Minimum3.02.54.52.57.07.04.02.56.52.57.57.5nsnsnsnsnsns3-93-93-63-63-63-6*Voltage Range 5.0 V is 5.0 V ±0.5 V.CAPACITANCESymbolCINCPDInput CapacitancePower Dissipation CapacitanceParameterValueTyp4.550.0UnitpFpFTest Conditions VCC = 5.0 V VCC = 5.0 VFACT DATA5-8元器件交易网www.cecb2b.comMC74AC259 MC74ACT259OUTLINE DIMENSIONSN SUFFIXPLASTIC DIP PACKAGECASE 648–08ISSUE R9–A–16B18NOTES:1.DIMENSIONING AND TOLERANCING PER ANSIY14.5M, 1982.2.CONTROLLING DIMENSION: INCH.3.DIMENSION L TO CENTER OF LEADS WHENFORMED PARALLEL.4.DIMENSION B DOES NOT INCLUDE MOLD FLASH.5.ROUNDED CORNERS OPTIONAL.DIMABCDFGHJKLMSINCHESMINMAX0.7400.7700.2500.2700.1450.1750.0150.0210.0400.700.100 BSC0.050 BSC0.0080.0150.1100.1300.2950.3050 _10 _0.0200.040MILLIMETERSMINMAX18.8019.556.356.853.694.440.390.531.021.772.54 BSC1.27 BSC0.210.382.803.307.507.740 _10 _0.511.01FSCL–T–HKGD16 PLSEATINGPLANEJTAMM0.25 (0.010)M–A–D SUFFIXPLASTIC SOIC PACKAGECASE 751B–05ISSUE J916–B–18P8 PL0.25 (0.010)MBSGFNOTES:1.DIMENSIONING AND TOLERANCING PERANSI Y14.5M, 1982.2.CONTROLLING DIMENSION: MILLIMETER.3.DIMENSIONS A AND B DO NOT INCLUDEMOLD PROTRUSION.4.MAXIMUM MOLD PROTRUSION 0.15 (0.006)PER SIDE.5.DIMENSION D DOES NOT INCLUDE DAMBARPROTRUSION. ALLOWABLE DAMBARPROTRUSION SHALL BE 0.127 (0.005) TOTALIN EXCESS OF THE D DIMENSION ATMAXIMUM MATERIAL CONDITION.MILLIMETERSMINMAX9.8010.003.804.001.351.750.350.490.401.251.27 BSC0.190.250.100.250 7 __5.806.200.250.50INCHESMINMAX0.3860.3930.1500.1570.0540.0680.0140.0190.0160.0490.050 BSC0.0080.0090.0040.0090 7 __0.2290.2440.0100.019KC–T–SEATINGPLANERX 45_MD16 PLMJ0.25 (0.010)TBSASDIMABCDFGJKMPRMotorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regardingthe suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, andspecifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in differentapplications. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. Motorola doesnot convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components insystems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure ofthe Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any suchunintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmlessagainst all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or deathassociated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part.Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.How to reach us:USA/EUROPE: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447MFAX: RMFAX0@email.sps.mot.com –TOUCHTONE (602) 244–6609INTERNET: http://Design–NET.comJAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, Toshikatsu Otsuki, 6F Seibu–Butsuryu–Center, 3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–3521–8315HONG KONG: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298◊FACT DATA5-9*MC74AC259/D*MC74AC259/D
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