Benefits and Features - Maxim Integrated

1 General DescriptionThe MAX3221/MAX3223/MAX3243 achieve 1 A supply current with Maxim s revolutionary AutoShutdown feature . When the MAX3221/MAX3223/MAX3243 do not sense a valid signal level on their receiver inputs, the on-board power supply and drivers shut down. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected peripheral are turned off. The system turns on again when a valid level is applied to any RS-232 receiver MAX3221/MAX3223/MAX3243 require only F capacitors in operation, and can operate from input voltages ranging from + to + proprietary, high-efficiency, dual charge-pump power supply and a low-dropout transmitter combine to deliver true RS-232 performance from a single + to + MAX3221 is a 1-driver/1-receiver 16-pin SSOP version of the 20-pin 2-driver/2-receiver MAX3243 is a 3-driver/5-receiver with a complementary always-active receiver for external monitoring in a variety of 28 pin packages.

2 See Order Information table for package Battery-Powered Equipment Hand-Held Equipment Peripherals Portable Diagnostics EquipmentBenefits and Features Integrated Charge Pump Circuitry Simplifies Power Requirements Eliminates the Need for a 12 Supply Operation From a Single + or +5V Supply 1 A Supply Current in Shutdown Mode Saves Power AutoShutdown feature is Enabled After No Activity on Receiver Inputs for 30 s Software Control Option for Shutdown19-0306; Rev 10; 5/19 Future product contact factory for RANGEPIN-PACKAGEMAX3221 CAE0 C to +70 C16 SSOPMAX3221 CUE 0 C to +70 C16 TSSOPMAX3221 EAE-40 C to +85 C16 SSOPMAX3221 EUE -40 C to +85 C16 TSSOPMAX3223 CPP0 C to +70 C20 Plastic DIPMAX3223 CAP0 C to +70 C20 SSOPMAX3223 CUP0 C to +70 C20 TSSOPMAX3223 EPP-40 C to +85 C20 Plastic DIPMAX3223 EAP-40 C to +85 C20 SSOPMAX3223 EUP-40 C to +85 C20 TSSOPMAX3243 CWI0 C to +70 C28 Wide SOMAX3243 CAI0 C to +70 C28 SSOPMAX3243 CUI0 C to +70 C28 TSSOPMAX3243 EWI-40 C to +85 C28 Wide SOMAX3243 EAI-40 C to +85 C28 SSOPMAX3243 EUI-40 C to +85 C28 TSSOPPARTTxRxVCC RANGE (V)

3 To to to sPin Configurations appear at end of data Operating Circuits appear at end of data and UCSP are trademarks of Maxim Integrated Products, InformationSelector GuideMAX3221/MAX3223/MAX3243+3V to + RS-232 Transceivers with AutoShutdownClick here for production status of specific part .. to +6VV+ (Note 1) .. to +7VV- (Note 1) ..+ to -7VV+ + |V-| (Note 1) ..+13 VInput Voltages T_IN, FORCEOFF, FORCEON, EN (MAX3223) .. to +6V 25 VOutput Voltages T_OUT .. R_OUT, INVALID .. to (VCC + )Short-Circuit Duration T_OUT ..ContinuousContinuous Power Dissipation (TA = +70 C) 16-Pin SSOP (derate C above +70 C) ..571mW 16-Pin TSSOP (derate C above +70 C) ..533mW 20-Pin Plastic DIP (derate C above +70 C) ..889mW 20-Pin SSOP (derate C above +70 C) ..640mW 20-Pin TSSOP DIP (derate C above +70 C) ..559mW 28-Pin Wide SO (derate C above +70 C).

4 1W 28-Pin SSOP (derate C above +70 C) ..762mW 28-Pin TSSOP (derate C above +70 C) ..696mWOperating Temperature Ranges MAX32_ _C_ _ ..0 C to +70 C MAX32_ _E_ _ ..-40 C to +85 CStorage Temperature Range ..-65 C to +150 CLead Temperature (soldering, 10s) ..+300 C(VCC = + to + , C1 C4 = F (Note 2), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25 C.)Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed CHARACTERISTICSS upply Current, AutoShutdownVCC = or , TA = +25 CAll R_IN open, FORCEON = GND, FORCEOFF = ASupply Current, ShutdownFORCEOFF = ASupply Current, AutoShutdown DisabledFORCEON = FORCEOFF = VCC, no INPUTS AND RECEIVER OUTPUTSI nput Logic Threshold LowT_IN, FORCEON, FORCEOFF, EN (MAX3223) Logic Threshold HighT_IN, EN, FORCEON, FORCEOFFVCC = = Leakage CurrentT_IN, EN, FORCEON, FORCEOFF AOutput Leakage CurrentReceivers disabled 10 AOutput Voltage LowIOUT = Voltage HighIOUT = - - (FORCEON = GND, FORCEOFF = VCC)Receiver Input Thresholds to Transmitters EnabledFigure 5 Positive Input Thresholds to Transmitters Disabled1 A supply current, Figure + Output Voltage LowIOUT = Output Voltage HighIOUT = - Threshold to Transmitters Enabled (tWU)

5 Figure 5250 sAbsolute maximum RatingsStresses beyond those listed under Absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device CharacteristicsMAX3221/MAX3223/MAX3243+3 V to + RS-232 Transceivers with Integrated 2(VCC = + to + , C1 C4 = F (Note 2), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25 C.)Note 2: C1 C4 = F, tested at 10%. C1 = F, C2 C4 = F, tested at 10%.PARAMETERCONDITIONSMINTYPMAXUNITSR eceiver Positive or Negative Threshold to INVALID High (tINVH)Figure 51 sReceiver Positive or Negative Threshold to INVALID Low (tINVL)Figure 530 sRECEIVER INPUTSI nput Voltage Range-25+25 VInput Threshold LowTA = +25 CVCC = = Threshold HighTA = +25 CVCC = = ResistanceTA = +25 C357k TRANSMITTER OUTPUTSO utput Voltage SwingAll transmitter outputs loaded with 3k to ground ResistanceVCC = V+ = V- = 0V, transmitter output = 2V30010M Output Short-Circuit Current 35 60mAOutput Leakage CurrentVOUT = 12V, VCC = 0V or to , transmitters disabled 25 AMOUSE DRIVEABILITY (MAX3243)

6 Transmitter Output VoltageT1IN = T2IN = GND, T3IN = VCC, T3 OUT loaded with 3k to GND, T1 OUT and T2 OUT loaded with each 5 VTIMING CHARACTERISTICSM aximum Data RateRL = 3k , CL = 1000pF, one transmitter switching120235kbpsReceiver Propagation DelayReceiver input to receiver output, CL = Output Enable TimeNormal operation200nsReceiver Output Disable TimeNormal operation200nsTransmitter Skew tPHL tPLH MAX3221/MAX3223200nsMAX32432001000 Receiver Skew tPHL tPLH MAX3221/MAX3223100nsMAX3243100500 Transition-Region Slew RateVCC = , RL = 3k to 7k , TA = +25 C, measured from +3V to -3V or -3V to +3 VCL = 200pF to sCL = 200pF to 1000pF630 Electrical Characteristics (continued)MAX3221/MAX3223/MAX3243+3V to + RS-232 Transceivers with Integrated 3(VCC = + , 235kbps data rate, F capacitors, all transmitters loaded with 3k , TA = +25 C, unless otherwise noted.)Typical Operating Characteristics-6-5-4-3-2-101234560 MAX3221/MAX3223 TRANSMITTER OUTPUT VOLTAGEvs.

7 LOAD CAPACITANCEMAX3221/3223-01 LOAD CAPACITANCE (pF)TRANSMITTER OUTPUT VOLTAGE (V)20003000100040005000 VOUT+ OUTPUT VOLTAGEvs. LOAD CAPACITANCEMAX3221/3223-04 LOAD CAPACITANCE (pF)TRANSMITTER OUTPUT VOLTAGE (V)20003000100040005000 VOUT+1 TRANSMITTER AT 235kbps2 TRANSMITTERS AT 30kbpsVOUT-0246810121416182022150500 MAX3221/MAX3223 SLEW RATE vs. LOAD CAPACITANCEMAX3221/3223-02 LOAD CAPACITANCE (pF)SLEW RATE (V/ s)20003000100040005000 FOR DATA RATES UP TO 235kbps+SLEW-SLEWALL OUTPUTS LOADED WITH 3kW +CL CHARGE-PUMP CAPACITORSFOR ALL DATA RATES UP TO 235kbps46810121416182022240 MAX3243 SLEW RATE vs. LOAD CAPACITANCEMAX3221/3223-05 LOAD CAPACITANCE (pF)SLEW RATE (V/ s)20003000100040005000+SLEW-SLEW51015202 5303540051015202530350 MAX3221/MAX3223 SUPPLY CURRENT vs. LOAD CAPACITANCEWHEN TRANSMITTING DATAMAX3221/3223-03 LOAD CAPACITANCE (pF)MAX3223 SUPPLY CURRENT (mA)MAX3221 SUPPLY CURRENT (mA)20003000100040005000235kbps120kbps20 kbps0510152025303545400 MAX3243 SUPPLY CURRENT vs.

8 LOAD CAPACITANCE WHEN TRANSMITTING DATA MAX3221/3223-06 LOAD CAPACITANCE (pF)SUPPLY CURRENT (mA)20003000100040005000235kbps120kbps20 kbpsMAX3221/MAX3223/MAX3243+3V to + RS-232 Transceivers with AutoShutdownMaxim Integrated DescriptionDual Charge-Pump Voltage ConverterThe MAX3221/MAX3223/MAX3243 s internal power supply consists of a regulated dual charge pump that provides output voltages of + (doubling charge pump) and (inverting charge pump), regardless of the input voltage (VCC) over the + to + range. The charge pumps operate in a discontinuous mode: if the output voltages are less than , the charge pumps are enabled; if the output voltages exceed , the charge pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- TransmittersThe transmitters are inverting level translators that convert CMOS-logic levels to EIA/TIA-232 levels.

9 They guarantee a 120kbps data rate with worst-case loads of 3k in parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as Laplink ). Typically, the MAX3221/MAX3223/MAX3243 can operate at data rates of 235kbps. Transmitters can be paralleled to drive multiple receivers or mice (MAX3243). Figure 1 shows a complete system FORCEOFF is driven to ground, or the auto-shut-down circuitry senses invalid voltage levels at all receiver inputs, the transmitters are disabled and the outputs are forced into a high-impedance is a trademark of Traveling ENReceiver Enable Control. Drive low for normal operation. Drive high to force the receiver outputs into a high-Z +Positive terminal of inverting charge-pump capacitor662C2-Negative terminal of inverting charge-pump generated by the charge pump89, 164 8R_INRS-232 Receiver Inputs138, 179, 10, 11T_OUTRS-232 Transmitter Outputs1112, 1312, 13, 14T_INTTL/CMOS Transmitter Inputs910, 1515 19R_OUTTTL/CMOS Receiver Outputs 20R2 OUTBN oninverting Receiver Output active in shutdown101121 INVALIDO utput of the valid signal detector.

10 Indicates if a valid RS-232 level is present on receiver inputs logic 1 .162022 FORCEOFFD rive low to shut down transmitters and on-board power supply. This overrides all automatic circuitry and FORCEON (Table 1).121423 FORCEOND rive high to override automatic circuitry keeping transmitters on (FORCEOFF must be high) (Table 1).4424C1-Negative terminal of the voltage doubler charge-pump capacitor141825 GNDG round151926 VCC+ to + Supply Voltage3327V++ generated by the charge pump2228C1+Positive terminal of the voltage doubler charge-pump capacitorPin DescriptionMAX3221/MAX3223/MAX3243+3V to + RS-232 Transceivers with Integrated 5RS-232 ReceiversThe MAX3221/MAX3223/MAX3243 s receivers convert RS-232 signals to CMOS-logic output levels. All receiv-ers have one inverting three-state output. In shutdown (FORCEOFF = low) or in AutoShutdown, the MAX3221/MAX3223 s receivers are active (Table 1).