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基于
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基于两个单片机串行通信的电子密码锁资料,基于,两个,单片机,串行,通信,通讯,电子,密码锁,资料
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General DescriptionThe MAX220MAX249 family of line drivers/receivers isintended for all EIA/TIA-232E and V.28/V.24 communica-tions interfaces, particularly applications where 12V isnot available. These parts are especially useful in battery-powered sys-tems, since their low-power shutdown mode reducespower dissipation to less than 5W. The MAX225,MAX233, MAX235, and MAX245/MAX246/MAX247 useno external components and are recommended for appli-cations where printed circuit board space is critical. _ApplicationsPortable ComputersLow-Power ModemsInterface TranslationBattery-Powered RS-232 SystemsMultidrop RS-232 Networks_FeaturesSuperior to Bipolara111 Operate from Single +5V Power Supply(+5V and +12VMAX231/MAX239)a111 Low-Power Receive Mode in Shutdown(MAX223/MAX242)a111 Meet All EIA/TIA-232E and V.28 Specificationsa111 Multiple Drivers and Receiversa111 3-State Driver and Receiver Outputsa111 Open-Line Detection (MAX243)Ordering InformationOrdering Information continued at end of data sheet.*Contact factory for dice specifications.MAX220MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers_ Maxim Integrated Products 1Selection Table19-4323; Rev 10; 8/01PARTMAX220CPEMAX220CSEMAX220CWE 0C to +70C0C to +70C0C to +70CTEMP. RANGE PIN-PACKAGE16 Plastic DIP16 Narrow SO16 Wide SOMAX220C/D 0C to +70C Dice*MAX220EPEMAX220ESEMAX220EWE -40C to +85C-40C to +85C-40C to +85C 16 Plastic DIP16 Narrow SO16 Wide SOMAX220EJE -40C to +85C 16 CERDIPMAX220MJE -55C to +125C 16 CERDIPPower No. of Nominal SHDN RxPart Supply RS-232 No. of Cap. Value & Three- Active in Data RateNumber (V) Drivers/Rx Ext. Caps (F) State SHDN (kbps) FeaturesMAX220 +5 2/2 4 0.1 No 120 Ultra-low-power, industry-standard pinoutMAX222 +5 2/2 4 0.1 Yes 200 Low-power shutdownMAX223 (MAX213) +5 4/5 4 1.0 (0.1) Yes 120 MAX241 and receivers active in shutdownMAX225 +5 5/5 0 Yes 120 Available in SOMAX230 (MAX200) +5 5/0 4 1.0 (0.1) Yes 120 5 drivers with shutdownMAX231 (MAX201) +5 and 2/2 2 1.0 (0.1) No 120 Standard +5/+12V or battery supplies; +7.5 to +13.2 same functions as MAX232MAX232 (MAX202) +5 2/2 4 1.0 (0.1) No 120 (64) Industry standardMAX232A +5 2/2 4 0.1 No 200 Higher slew rate, small capsMAX233 (MAX203) +5 2/2 0 No 120 No external capsMAX233A +5 2/2 0 No 200 No external caps, high slew rateMAX234 (MAX204) +5 4/0 4 1.0 (0.1) No 120 Replaces 1488MAX235 (MAX205) +5 5/5 0 Yes 120 No external capsMAX236 (MAX206) +5 4/3 4 1.0 (0.1) Yes 120 Shutdown, three stateMAX237 (MAX207) +5 5/3 4 1.0 (0.1) No 120 Complements IBM PC serial portMAX238 (MAX208) +5 4/4 4 1.0 (0.1) No 120 Replaces 1488 and 1489MAX239 (MAX209) +5 and 3/5 2 1.0 (0.1) No 120 Standard +5/+12V or battery supplies; +7.5 to +13.2 single-package solution for IBM PC serial portMAX240 +5 5/5 4 1.0 Yes 120 DIP or flatpack packageMAX241 (MAX211) +5 4/5 4 1.0 (0.1) Yes 120 Complete IBM PC serial portMAX242 +5 2/2 4 0.1 Yes 200 Separate shutdown and enableMAX243 +5 2/2 4 0.1 No 200 Open-line detection simplifies cablingMAX244 +5 8/10 4 1.0 No 120 High slew rateMAX245 +5 8/10 0 Yes 120 High slew rate, int. caps, two shutdown modesMAX246 +5 8/10 0 Yes 120 High slew rate, int. caps, three shutdown modesMAX247 +5 8/9 0 Yes 120 High slew rate, int. caps, nine operating modesMAX248 +5 8/8 4 1.0 Yes 120 High slew rate, selective half-chip enablesMAX249 +5 6/10 4 1.0 Yes 120 Available in quad flatpack packageFor pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxims website at .MAX220MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers2 _ABSOLUTE MAXIMUM RATINGSMAX220/222/232A/233A/242/243ELECTRICAL CHARACTERISTICSMAX220/222/232A/233A/242/243(VCC= +5V 10%, C1C4 = 0.1F MAX220, C1 = 0.047F, C2C4 = 0.33F, TA= TMINto TMAX unless otherwise noted.)Note 1: Input voltage measured with TOUTin high-impedance state, SHDN or VCC= 0V.Note 2: For the MAX220, V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.Supply Voltage (VCC) .-0.3V to +6VInput VoltagesTIN.-0.3V to (VCC- 0.3V)RIN (Except MAX220) .30VRIN (MAX220).25VTOUT(Except MAX220) (Note 1) .15VTOUT (MAX220).13.2VOutput VoltagesTOUT.15VROUT.-0.3V to (VCC+ 0.3V)Driver/Receiver Output Short Circuited to GND.ContinuousContinuous Power Dissipation (TA= +70C)16-Pin Plastic DIP (derate 10.53mW/C above +70C).842mW18-Pin Plastic DIP (derate 11.11mW/C above +70C).889mW20-Pin Plastic DIP (derate 8.00mW/C above +70C) .440mW16-Pin Narrow SO (derate 8.70mW/C above +70C) .696mW16-Pin Wide SO (derate 9.52mW/C above +70C).762mW18-Pin Wide SO (derate 9.52mW/C above +70C).762mW20-Pin Wide SO (derate 10.00mW/C above +70C).800mW20-Pin SSOP (derate 8.00mW/C above +70C) .640mW16-Pin CERDIP (derate 10.00mW/C above +70C).800mW18-Pin CERDIP (derate 10.53mW/C above +70C).842mWOperating Temperature RangesMAX2_ _AC_ _, MAX2_ _C_ _.0C to +70CMAX2_ _AE_ _, MAX2_ _E_ _ .-40C to +85CMAX2_ _AM_ _, MAX2_ _M_ _.-55C to +125CStorage Temperature Range .-65C to +160CLead Temperature (soldering, 10sec) .+300CV1.4 0.8Input Logic Threshold LowUNITSMIN TYP MAXPARAMETER CONDITIONSInput Logic Threshold HighAll devices except MAX220 2 1.4VAll except MAX220, normal operation 540Logic Pull-Up/lnput CurrentSHDN = 0V, MAX222/242, shutdown, MAX220 0.01 1AVCC= 5.5V, SHDN = 0V, VOUT = 15V, MAX222/242 0.01 10Output Leakage CurrentVCC= SHDN = 0V, VOUT= 15V 0.01 10A200 116Data Rate kb/sTransmitter Output Resistance VCC= V+ = V- = 0V, VOUT= 2V 300 10M Output Short-Circuit Current VOUT= 0V 7 22 mARS-232 Input Voltage Operating Range 30 VAll except MAX243 R2IN0.8 1.3RS-232 Input Threshold Low VCC= 5VMAX243 R2IN(Note 2) -3VAll except MAX243 R2IN1.8 2.4RS-232 Input Threshold High VCC= 5VMAX243 R2IN(Note 2) -0.5 -0.1VAll except MAX243, VCC = 5V, no hysteresis in shdn. 0.2 0.5 1RS-232 Input HysteresisMAX243 1VRS-232 Input Resistance 357kTTL/CMOS Output Voltage Low IOUT= 3.2mA 0.2 0.4 VTTL/CMOS Output Voltage High IOUT= -1.0mA 3.5 VCC- 0.2 VSourcing VOUT= GND -2 -10mATTL/CMOS Output Short-Circuit CurrentShrinking VOUT= VCC10 30V5 8Output Voltage Swing All transmitter outputs loaded with 3k to GNDRS-232 TRANSMITTERSRS-232 RECEIVERS2.4MAX220: VCC= 5.0VMAX220MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers_ 3Note 3: MAX243 R2OUTis guaranteed to be low when R2INis 0V or is floating.ELECTRICAL CHARACTERISTICSMAX220/222/232A/233A/242/243 (continued)(VCC= +5V 10%, C1C4 = 0.1F MAX220, C1 = 0.047F, C2C4 = 0.33F, TA= TMINto TMAX unless otherwise noted.)Operating Supply VoltageSHDN Threshold High4.5 5.5 VMAX222/242Transmitter-Output Enable Time (SHDN goes high), Figure 42.0 1.4 VMAX220 0.5 2tETNo loadMAX222/232A/233A/242/243 410MAX222/232A/233A/242/243 61230MAX220 12VCCSupply Current (SHDN = VCC),Figures 5, 6, 11, 193k load both inputsMAX222/232A/233A/242/243 15mATransition Slew RateTA= +25C 0.1 10CL= 50pF to 2500pF, RL= 3k to 7k, VCC= 5V, TA= +25C,measured from +3V to -3V or -3V to +3VTA= 0C to +70CCONDITIONS250MAX220 1.5 3 30V/sTA= -40C to +85C 250MAX222/242, 0.1F caps(includes charge-pump start-up)Shutdown Supply Current MAX222/242TA= -55C to +125C 35 100ASHDN Input Leakage Current MAX222/242 1 ASHDN Threshold Low MAX222/242 1.4 0.8 V250MAX222/232A/233A/242/243 1.3 3.5stPHLTMAX220 410Transmitter-Output Disable Time (SHDN goes low), Figure 4tDTMAX222/232A/233A/242/243 1.5 3.5Transmitter Propagation DelayTLL to RS-232 (normal operation), Figure 1tPLHTMAX220 510sV2.0 1.4MAX222/242, 0.1F capsA0.05 10600TTL/CMOS Output Leakage CurrentEN Input Threshold HighMAX222/232A/233A/242/243 0.5 1nstPHLRMAX220 0.6 3tPLHRMAX222/232A/233A/242/243 0.6 1Receiver Propagation DelayRS-232 to TLL (normal operation),Figure 2tPHLT- tPLHTMAX220 0.8 3sMAX222/232A/233A/242/243tPHLSMAX242 0.5 10Receiver Propagation Delay RS-232 to TLL (shutdown), Figure 2tPLHSMAX242 2.5 10sReceiver-Output Enable Time, Figure 3 tERMAX242UNITSMIN TYP MAX125 500PARAMETERMAX242nsSHDN = VCCor EN = VCC (SHDN = 0V for MAX222),0V VOUT VCCReceiver-Output Disable Time, Figure 3 tDRMAX242 160 500 ns300nsTransmitter + to - Propagation Delay Difference (normal operation)MAX220 2000tPHLR- tPLHRMAX222/232A/233A/242/243 100nsReceiver + to - Propagation Delay Difference (normal operation)MAX220 225V1.4 0.8EN Input Threshold Low MAX242MAX220MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers4 _Typical Operating CharacteristicsMAX220/MAX222/MAX232A/MAX233A/MAX242/MAX243108-100 5 15 25OUTPUT VOLTAGE vs. LOAD CURRENT-4-6-8-2642MAX220-01LOAD CURRENT (mA)OUTPUT VOLTAGE (V)100200.1FEITHER V+ OR V- LOADEDVCC = 5VNO LOAD ONTRANSMITTER OUTPUTS(EXCEPT MAX220, MAX233A)V- LOADED, NO LOAD ON V+V+ LOADED, NO LOAD ON V-1F1F0.1F11104010 40 60AVAILABLE OUTPUT CURRENTvs. DATA RATE65798MAX220-02DATA RATE (kbits/sec)OUTPUT CURRENT (mA)20 30 50OUTPUT LOAD CURRENTFLOWS FROM V+ TO V-VCC= +5.25VALL CAPS1FALL CAPS0.1FVCC= +4.75V+10V-10VMAX222/MAX242ON-TIME EXITING SHUTDOWN+5V+5V0V0VMAX220-03500s/divV+, V- VOLTAGE (V)1F CAPSV+V+V-V-SHDN0.1F CAPS1F CAPS0.1F CAPSMAX220MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers_ 5VCC.-0.3V to +6VV+.(VCC- 0.3V) to +14VV- .+0.3V to -14VInput VoltagesTIN.-0.3V to (VCC+ 0.3V)RIN.30VOutput VoltagesTOUT.(V+ + 0.3V) to (V- - 0.3V)ROUT.-0.3V to (VCC+ 0.3V)Short-Circuit Duration, TOUT.ContinuousContinuous Power Dissipation (TA= +70C)14-Pin Plastic DIP (derate 10.00mW/C above +70C).800mW16-Pin Plastic DIP (derate 10.53mW/C above +70C).842mW20-Pin Plastic DIP (derate 11.11mW/C above +70C).889mW24-Pin Narrow Plastic DIP(derate 13.33mW/C above +70C) .1.07W24-Pin Plastic DIP (derate 9.09mW/C above +70C).500mW16-Pin Wide SO (derate 9.52mW/C above +70C).762mW20-Pin Wide SO (derate 10 00mW/C above +70C).800mW24-Pin Wide SO (derate 11.76mW/C above +70C).941mW28-Pin Wide SO (derate 12.50mW/C above +70C) .1W44-Pin Plastic FP (derate 11.11mW/C above +70C) .889mW14-Pin CERDIP (derate 9.09mW/C above +70C) .727mW16-Pin CERDIP (derate 10.00mW/C above +70C) .800mW20-Pin CERDIP (derate 11.11mW/C above +70C) .889mW24-Pin Narrow CERDIP(derate 12.50mW/C above +70C) .1W24-Pin Sidebraze (derate 20.0mW/C above +70C).1.6W28-Pin SSOP (derate 9.52mW/C above +70C).762mWOperating Temperature RangesMAX2 _ _ C _ _.0C to +70CMAX2 _ _ E _ _.-40C to +85CMAX2 _ _ M _ _ .-55C to +125CStorage Temperature Range .-65C to +160CLead Temperature (soldering, 10sec) .+300CABSOLUTE MAXIMUM RATINGSMAX223/MAX230MAX241ELECTRICAL CHARACTERISTICSMAX223/MAX230MAX241(MAX223/230/232/234/236/237/238/240/241, VCC= +5V 10; MAX233/MAX235, VCC= 5V 5% C1C4 = 1.0F; MAX231/MAX239,VCC= 5V 10%; V+ = 7.5V to 13.2V; TA= TMINto TMAX; unless otherwise noted.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.CONDITIONS MIN TYP MAX UNITSOutput Voltage Swing All transmitter outputs loaded with 3k to ground 5.0 7.3 VVCCPower-Supply CurrentNo load,TA= +25C510mA7150.4 1V+ Power-Supply Current1.8 5mA515Shutdown Supply Current TA= +25C15 50VInput Logic Threshold HighTIN2.0EN, SHDN (MAX223);EN, SHDN (MAX230/235/236/240/241)2.4Logic Pull-Up Current TIN =0V 1.5 200Receiver Input VoltageOperating Range-30 30 VAA110VInput Logic Threshold Low TIN; EN, SHDN (MAX233); EN, SHDN (MAX230/235241) 0.8MAX231/239MAX223/230/234238/240/241MAX232/233PARAMETERMAX239MAX230/235/236/240/241MAX231MAX223mAMAX220MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers6 _V0.8 1.2PARAMETER MIN TYP MAX UNITSCONDITIONSNormal operationSHDN = 5V (MAX223)SHDN = 0V (MAX235/236/240/241)1.7 2.4RS-232 Input Threshold LowTA= +25C, VCC= 5V0.6 1.5VRS-232 Input Threshold HighTA= +25C,VCC= 5VShutdown (MAX223)SHDN = 0V,EN = 5V (R4IN R5IN)1.5 2.4ELECTRICAL CHARACTERISTICSMAX223/MAX230MAX241 (continued)(MAX223/230/232/234/236/237/238/240/241, VCC= +5V 10; MAX233/MAX235, VCC= 5V 5% C1C4 = 1.0F; MAX231/MAX239,VCC= 5V 10%; V+ = 7.5V to 13.2V; TA= TMINto TMAX; unless otherwise noted.)Shutdown (MAX223)SHDN = 0V,EN = 5V (R4IN, R5IN)Normal operationSHDN = 5V (MAX223)SHDN = 0V (MAX235/236/240/241)RS-232 Input Hysteresis VCC= 5V, no hysteresis in shutdown 0.2 0.5 1.0 VRS-232 Input Resistance TA= +25C, VCC= 5V 357kTTL/CMOS Output Voltage Low IOUT= 1.6mA (MAX231/232/233, IOUT= 3.2mA) 0.4 VTTL/CMOS Output Voltage High IOUT = -1mA 3.5 VCC- 0.4 VTTL/CMOS Output Leakage Current0V ROUT VCC; EN = 0V (MAX223); EN = VCC(MAX235241 )0.05 10 AMAX223 600nsReceiver Output Enable TimeNormal operationMAX235/236/239/240/241 400MAX223 900nsReceiver Output Disable TimeNormal operationMAX235/236/239/240/241 250Normal operation 0.5 10sSHDN = 0V(MAX223)440Propagation DelayRS-232 IN toTTL/CMOS OUT,CL= 150pF6403 5.1 30V/sMAX231/MAX232/MAX233, TA= +25C, VCC= 5V, RL= 3k to 7k, CL= 50pF to 2500pF, measured from+3V to -3V or -3V to +3V430Transmitter Output Resistance VCC= V+ = V- = 0V, VOUT= 2V 300 Transmitter Output Short-CircuitCurrent10 mAtPHLStPLHSTransition Region Slew RateMAX223/MAX230/MAX234241, TA= +25C, VCC= 5V, RL= 3k to 7k CL= 50pF to 2500pF, measured from+3V to -3V or -3V to +3VMAX220MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers_ 5.5TRANSMITTER OUTPUTVOLTAGE (VOH) vs. VCC7.08.0MAX220-04VCC(V)VOH(V)5.07.51 TRANSMITTERLOADED3 TRANS-MITTERSLOADED4 TRANSMITTERSLOADED2 TRANSMITTERSLOADEDTA= +25CC1C4 = 1FTRANSMITTERLOADS =3k | 2500pF7.46.00 2500TRANSMITTER OUTPUT VOLTAGE (VOH)vs. LOAD CAPACITANCE ATDIFFERENT DATA RATES7.0MAX220-05LOAD CAPACITANCE (pF)VOH(V)15001000500 20006.86.6160kbits/sec80kbits/sec20kbits/secTA= +25CVCC= +5V3 TRANSMITTERS LOADEDRL= 3kC1C4 = 1F12.04.00 2500TRANSMITTER SLEW RATEvs. LOAD CAPACITANCE6.05.011.09.010.0MAX220-06LOAD CAPACITANCE (pF)SLEW RATE (V/s)15001000500 20008.07.0TA= +25CVCC= +5VLOADED, RL= 3kC1C4 = 1F1 TRANSMITTER LOADED2 TRANSMITTERSLOADED3 TRANSMITTERSLOADED4 TRANSMITTERSLOADED-6.0-9.04.5 5.5TRANSMITTER OUTPUTVOLTAGE (VOL) vs. VCC-8.0-8.5-6.5-7.0MAX220-07VCC(V)VOL(V)5.0-7.54 TRANS-MITTERSLOADEDTA= +25CC1C4 = 1FTRANSMITTERLOADS =3k | 2500pF1 TRANS-MITTERLOADED2 TRANS-MITTERSLOADED3 TRANS-MITTERSLOADED-6.0-7.60 2500TRANSMITTER OUTPUT VOLTAGE (VOL)vs. LOAD CAPACITANCE ATDIFFERENT DATA RATES-7.0-7.2-7.4-6.2-6.4MAX220-08LOAD CAPACITANCE (pF)VOL(V)15001000500 2000-6.6-6.8160kbits/sec80kbits/sec20Kkbits/secTA= +25CVCC= +5V3 TRANSMITTERS LOADEDRL= 3kC1C4 = 1F10-100 5 10 15 20 25 30 35 40 45 50TRANSMITTER OUTPUT VOLTAGE (V+, V-)vs. LOAD CURRENT-2-6-4-886MAX220-09CURRENT (mA)V+, V- (V)420V+ AND V-EQUALLYLOADEDV- LOADED,NO LOADON V+TA= +25CVCC= +5VC1C4 = 1FALL TRANSMITTERS UNLOADEDV+ LOADED,NO LOADON V-_Typical Operating CharacteristicsMAX223/MAX230M
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