SN74LVC4245AOCTAL BUS TRANSCEIVER AND 3.3-V TO 5-V SHIFTERWITH 3-STATE OUTPUTSSCAS375D – MARCH 1994 – REVISED JUNE 1998DEPIC™ (Enhanced-Performance ImplantedDDDCMOS) Submicron Process3.3-V to 5-V Bidirectional Level ShifterLatch-Up Performance Exceeds 250 mA PerJESD 17Package Options Include PlasticSmall-Outline (DW), Shrink Small-Outline(DB), and Thin Shrink Small-Outline (PW)PackagesDB, DW, OR PW PACKAGE(TOP VIEW)descriptionThis 8-bit (octal) noninverting bus transceivercontains two separate supply rails; B port hasVCCB, which is set at 3.3 V, and A port has VCCA,which is set at 5 V. This allows for translation froma 3.3-V to a 5-V environment, and vice versa.反过来也一样(5 V) VCCADIRA1A2A3A4A5A6A7A8GNDGND123456789101112242322212019181716151413VCCB (3.3 V)VCCB (3.3 V)OEB1B2B3B4B5B6B7 B8GNDThe SN74LVC4245A is designed for asynchronous communication between data buses. The device transmitsdata from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at thedirection-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses areeffectively isolated.The SN74LVC4245A pinout allows the designer to switch to a normal all-3.3-V or all-5-V 20-pin ’245 devicewithout board re-layout. The designer uses the data paths for pins 2–11 and 14–23 of the SN74LVC4245A toalign with the conventional ’245 pinout.The SN74LVC4245A is characterized for operation from –40°C to 85°C.FUNCTION TABLEINPUTSOELLHDIRLHXOPERATIONB data to A busA data to B busIsolationPlease be aware that an important notice concerning availability, standard warranty, and use in critical applications ofTexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.EPIC is a trademark of Texas Instruments Incorporated.PRODUCTION DATA information is current as of publication date.Products conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarily includetesting of all parameters.Copyright © 1998, Texas Instruments IncorporatedPOST OFFICE BOX 655303 DALLAS, TEXAS 75265•1SCAS375D – MARCH 1994 – REVISED JUNE 1998SN74LVC4245AOCTAL BUS TRANSCEIVER AND 3.3-V TO 5-V SHIFTERWITH 3-STATE OUTPUTSlogic diagram (positive logic)DIR2 22OEA1321B1To Seven Other Channelsabsolute maximum ratings over operating free-air temperature range for VCCA = 5 V (unlessotherwise noted)†Supply voltage range, VCCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 6.5 VInput voltage range, VI: A port (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to VCCA + 0.5 VControl inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 6 VOutput voltage range, VO: A port (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to VCCA + 0.5 VInput clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mAOutput clamp current, IOK (VO < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mAContinuous output current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mAContinuous current through each VCCA or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±100 mAPackage thermal impedance, θJA (see Note 2):DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104°C/WDW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81°C/WPW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120°C/WStorage temperature range, Tstg –65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . °C to 150°C†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, andfunctional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is notimplied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.NOTES:1. This value is limited to 6 V maximum.2.The package thermal impedance is calculated in accordance with JESD 51.2POST OFFICE BOX 655303 DALLAS, TEXAS 75265• SN74LVC4245AOCTAL BUS TRANSCEIVER AND 3.3-V TO 5-V SHIFTERWITH 3-STATE OUTPUTSSCAS375D – MARCH 1994 – REVISED JUNE 1998absolute maximum ratings over operating free-air temperature range for VCCB = 3.3 V (unlessotherwise noted)†Supply voltage range, VCCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 4.6 VInput voltage range, VI: B port (see Note 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to VCCB + 0.5 VOutput voltage range, VO: B port (see Note 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to VCCB + 0.5 VInput clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mAOutput clamp current, IOK (VO < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mAContinuous output current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mAContinuous current through VCCB or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±100 mAPackage thermal impedance, θJA (see Note 2):DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104°C/WDW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81°C/WPW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120°C/WStorage temperature range, Tstg –65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . °C to 150°C†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, andfunctional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is notimplied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.NOTES:2.The package thermal impedance is calculated in accordance with JESD 51.3.This value is limited to 4.6 V maximum.recommended operating conditions for VCCA = 5 V (see Note 4)MINVCCAVIHVILVIVOIOHIOLTASupply voltageHigh-level input voltageLow-level input voltageInput voltageOutput voltageHigh-level output currentLow-level output currentOperating free-air temperature–40004.520.8VCCAVCCA–242485MAX5.5UNITVVVVVmAmA°CNOTE 4: All unused inputs of the device must be held at the associated VCC or GND to ensure proper device operation. Refer to the TI applicationreport, Implications of Slow or Floating CMOS Inputs, literature number SCBA004.recommended operating conditions for VCCB = 3.3 V (see Note 4)MINVCCBVIHVILVIVOIOHIOLSupply voltageHigh-level input voltageLow-level input voltageInput voltageOutput voltageHighleveloutputcurrentHigh-level output currentLowleveloutputcurrentLow-level output currentVCCB = 2.7 VVCCB = 3 VVCCB = 2.7 VVCCB = 3 VVCCB = 2.7 V to 3.6 VVCCB = 2.7 V to 3.6 V2.720.800VCCBVCCB–12–241224MAX3.6UNITVVVVVmAmATAOperating free-air temperature–4085°CNOTE 4: All unused inputs of the device must be held at the associated VCC or GND to ensure proper device operation. Refer to the TI applicationreport, Implications of Slow or Floating CMOS Inputs, literature number SCBA004.POST OFFICE BOX 655303 DALLAS, TEXAS 75265•3SCAS375D – MARCH 1994 – REVISED JUNE 1998SN74LVC4245AOCTAL BUS TRANSCEIVER AND 3.3-V TO 5-V SHIFTERWITH 3-STATE OUTPUTS electrical characteristics over recommended operating free-air temperature range for VCCA = 5 V(unless otherwise noted) (see Note 5)PARAMETERIOH = –100 =100µAVOHIOH = –24 mA=24mAIOL = 100 =100µAVOLIOL = 24 mA=24mAIIIOZ‡ICCA∆ICCA§CiCioControl inputsA portControl inputsA portVI = VCCA or GNDVO = VCCA or GNDVI = VCCA or GND,One input at 3.4 V,VI = VCCA or GNDVO = VCCA or GNDIO = 0Other inputs at VCCA or GNDTEST CONDITIONSVCCA4.5 V5.5 V4.5 V5.5 V4.5 V5.5 V4.5 V5.5 V5.5 V5.5 V5.5 V5.5 VOpen5 V511MIN4.35.33.74.70.20.20.550.55±1±5801.5µAµAµAmApFpFVVTYP†MAXUNIT†All typical values are measured at VCC = 5 V, TA = 25°C.‡For I/O ports, the parameter IOZ includes the input leakage current.§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 associated VCC.NOTE 5: VCCB = 2.7 V to 3.6 Velectrical characteristics over recommended operating free-air temperature range for VCCB = 3.3 V(unless otherwise noted) (see Note 6)PARAMETERIOH = –100 µAVOHIOH = –12 mA=12mAIOH = –24 mAIOL = 100 µAVOLIOZ‡ICCB∆ICCB§CioB portB portIOL = 12 mAIOL = 24 mAVO = VCCB or GNDVI = VCCB or GND,One input at VCCB – 0.6 V,IO = 0Other inputs at VCCB or GNDTEST CONDITIONSVCCB2.7 V to 3.6 V2.7 V3 V3 V2.7 V to 3.6 V2.7 V3 V3.6 V3.6 V2.7 V to 3.6 VMINVCC–0.22.22.420.20.40.55±5500.5µAµAmAVTYP¶MAXUNITVVO = VCCB or GND3.3 V11pF‡For I/O ports, the parameter IOZ includes the input leakage current.§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 associated VCC.¶All typical values are measured at VCC = 3.3 V, TA = 25°C.NOTE 6: VCCA = 5 V ±0.5 V4POST OFFICE BOX 655303 DALLAS, TEXAS 75265• SN74LVC4245AOCTAL BUS TRANSCEIVER AND 3.3-V TO 5-V SHIFTERWITH 3-STATE OUTPUTSSCAS375D – MARCH 1994 – REVISED JUNE 1998switching characteristics over recommended operating free-air temperature range, CL = 50 pF(unless otherwise noted) (see Figures 1 and 2)PARAMETERtPHLtPLHtPHLtPLHtPZLtPZHtPZLtPZHtPLZtPHZtPLZtPHZFROM(INPUT)ABOEOEOEOETO(OUTPUT)BAABABVCCA = 5 V ± 0.5 V,VCCB = 2.7 V TO 3.6 VMIN111111111111MAX6.36.76.1598.18.89.875.87.77.8nsnsnsnsnsnsUNIToperating characteristics, VCCA = 5 V, VCCB = 3.3 V, TA = 25°CPARAMETERCpddPowerdissipationcapacitancepertransceiverPower dissipation capacitance per transceiverOutputs enabledOutputs disabledTEST CONDITIONSCL = 0,=0f=10MHzf = 10 MHzTYP39.55UNITpFPOST OFFICE BOX 655303 DALLAS, TEXAS 75265•5SCAS375D – MARCH 1994 – REVISED JUNE 1998SN74LVC4245AOCTAL BUS TRANSCEIVER AND 3.3-V TO 5-V SHIFTERWITH 3-STATE OUTPUTSPARAMETER MEASUREMENT INFORMATION (A PORT)2 × VCCFrom OutputUnder TestCL = 50 pF(see Note A)500 ΩS1OpenGND500 ΩTESTtPLH/tPHLtPLZ/tPZLtPHZ/tPZHS1Open2 × VCCGND LOAD CIRCUITtwVCCInput1.5 V1.5 V0 VVOLTAGE WAVEFORMSPULSE DURATIONVCCInputtPLHOutput50% VCC50% VCC1.5 V1.5 V0 VtPHLVOHVOLVOLTAGE WAVEFORMSPROPAGATION DELAY TIMESNONINVERTING OUTPUTSOutputControltPZLOutputWaveform 1S1 at 2 × VCC(see Note B)OutputWaveform 2S1 at GND(see Note B)tPLZ50% VCCtPZH50% VCCtPHZVOH – 0.3 VVOH≈ 0 VVOLTAGE WAVEFORMSENABLE AND DISABLE TIMESLOW- AND HIGH-LEVEL ENABLINGVCCVOL + 0.3 VVOL3 V1.5 V1.5 V0 VNOTES: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 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 Ω, tr ≤ 2.5 ns, tf≤ 2.5 ns.D.The outputs are measured one at a time with one transition per measurement.Figure 1. Load Circuit and Voltage Waveforms6POST OFFICE BOX 655303 DALLAS, TEXAS 75265• SN74LVC4245AOCTAL BUS TRANSCEIVER AND 3.3-V TO 5-V SHIFTERWITH 3-STATE OUTPUTSSCAS375D – MARCH 1994 – REVISED JUNE 1998PARAMETER MEASUREMENT INFORMATION (B PORT)7 VFrom OutputUnder TestCL = 50 pF(see Note A)500 ΩS1OpenGND500 ΩTESTtPLH/tPHLtPLZ/tPZLtPHZ/tPZHS1Open7 VGNDLOAD CIRCUITtw3 VInput1.5 V1.5 V0 VVOLTAGE WAVEFORMSPULSE DURATIONOutputControltPZL3 VInputtPLHOutput1.5 V1.5 V1.5 V0 VtPHLVOH1.5 VVOLVOLTAGE WAVEFORMSPROPAGATION DELAY TIMESNONINVERTING OUTPUTSOutputWaveform 2S1 at GND(see Note B)OutputWaveform 1S1 at 7 V(see Note B)tPZHtPLZ1.5 VtPHZVOH – 0.3 VVOH≈ 0 VVOLTAGE WAVEFORMSENABLE AND DISABLE TIMESLOW- AND HIGH-LEVEL ENABLING3.5 VVOL + 0.3 VVOL3 V1.5 V1.5 V0 V1.5 VNOTES: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 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 Ω, tr ≤ 2.5 ns, tf≤ 2.5 ns.D.The outputs are measured one at a time with one transition per measurement.Figure 2. Load Circuit and Voltage WaveformsPOST OFFICE BOX 655303 DALLAS, TEXAS 75265•7IMPORTANT NOTICE
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