±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 ...

1 _____General DescriptionThe MAX3233E/MAX3235E are EIA/TIA-232 and interfaces with automatic shutdown/wake-up features, high data-rate capabilities, andenhanced electrostatic discharge (ESD) protection. Alltransmitter outputs and receiver inputs are protected to 15kv using IEC 1000-4-2 Air-Gap Discharge, to 8kVusing IEC 1000-4-2 Contact Discharge, and to 15kVusing the Human Body Model. The MAX3233E operatesfrom a + supply; the MAX3235E operates from + devices achieve a 1 A supply current using Maxim srevolutionary AutoShutdown Plus feature.

2 Thesedevices automatically enter a low-power shutdownmode when the following two conditions occur: eitherthe RS-232 cable is disconnected or the transmitters ofthe connected peripherals are inactive, and the UART driving the transmitter inputs is inactive for more than30 seconds. They turn on again when they sense avalid transition at any transmitter or receiver Plus saves power without changes tothe existing BIOS or operating MAX3233E/MAX3235E have internal dual chargepumps requiring no external capacitors.

3 Both trans-ceivers have a proprietary low-dropout transmitter out-put stage that enables true RS-232 performance from a+ to + supply for the MAX3233E or a + to+ supply for the MAX3235E. These devices areguaranteed to operate up to 250kbps. Both are avail-able in space-saving 20-pin wide SO or plastic and Palmtop ComputersCellular PhonesBattery-Powered EquipmentHandheld EquipmentPeripheralsEmbedded Systems_____Features ESD Protection for RS-232 I/O Pins 15kv Human Body Model 8kV IEC 1000-4-2, Contact Discharge 15kv IEC 1000-4-2, Air-Gap Discharge Latchup Free 1 A Supply Current AutoShutdown Plus 1997 EDN MagazineInnovation of the Year Single-Supply Operation + to + (MAX3233E)+ to + (MAX3235E)

4 250kbps Guaranteed Data Rate 6V/ s Guaranteed Slew Rate Meets EIA/TIA-232 Specifications Down to (MAX3233E) Internal Charge-Pump CapacitorsMAX3233E/MAX3235E 15kv ESD- protected , 1 A, 250kbps, , Dual RS-232 Transceivers with Internal Capacitors_____Maxim Integrated Products119-1473; Rev 2; 8/04 PARTMAX3233 ECWP0 C to +70 CTEMP RANGEPIN-PACKAGE20 SOAutoShutdown Plus is a trademark of Maxim Integrated Products, InformationOrdering Information continued at end of data +C1-C1+V+V+INVALIDT2 INT1 INFORCEONR1 OUTT1 OUTR1 INVCCFORCEOFF291056783192011 CHARGEPUMPSO/DIPPin Configuration/ Functional DiagramTypical Operating Circuit appears at end of data C to +70 C20 Plastic DIPMAX3233 EEPP-40 C to +85 C20 Plastic DIPMAX3233 EEWP-40 C to +85 C20 SO Co7.

5 4, pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim s website at MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(VCC= + to + for MAX3233E, VCC= + to + for MAX3235E; TA= TMINto TMAX, unless otherwise noted. Typical val-ues are at TA= +25 C.)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.

6 Exposure toabsolute maximum rating conditions for extended periods may affect device GND (MAX3233E).. to +4 VVCCto GND (MAX3235E).. to +6VV+ to GND (Note 1) .. to +7VV- to GND (Note 1) ..+ to -7VV+ + |V-|(Note 1)..+13 VInput VoltagesT_IN, FORCEON, FORCEOFFto to +6VR_IN to GND .. 25 VOutput VoltagesT_OUT to , INVALIDto GND .. to (VCC+ )Short-Circuit DurationT_OUT to GND ..ContinuousContinuous Power Dissipation (TA= +70 C)Wide SO (derate 10mW/ C above +70 C)..800mWPlastic DIP (derate C above +70 C) ..889mWOperating Temperature RangesMAX323_EC_P.

7 0 C to +70 CMAX323_EE_P ..-40 C to +85 CStorage Temperature Range ..-65 C to +150 CLead Temperature (soldering, 10s) (Note 2) ..+300 CNote 1:V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 2:Maximum reflow temperature is +220 = GND, FORCEOFF= VCC,all R_IN idle, all T_IN idleTA= +25 CCONDITIONSk 357 Input Threshold Threshold LowV-25+25 Input Voltage RangeVVCC- VCC- Voltage Voltage Low A110 Supply Current, Shutdown A110 Supply Current,AutoShutdown Plus A 1 Transmitter Input Hysteresis Logic Threshold Current, AutoShutdown Plus Logic Threshold Low2 UNITSMINTYPMAXSYMBOLPARAMETERFORCEOFF= GNDTA= +25 CT_IN, FORCEON, FORCEOFFFORCEON = FORCEOFF= VCC, no loadT_IN, FORCEON.

8 FORCEOFFIOUT= Leakage CurrentDC CHARACTERISTICS(VCC= for MAX3233E, VCC= for MAX3235E, TA= +25 C.)LOGIC INPUTS AND RECEIVER OUTPUTSRECEIVER INPUTSTA= +25 CVCC= , MAX3235 EVCC= , MAX3233 EVCC= , MAX3235 EVCC= , MAX3233E 15kv ESD- protected , 1 A, 250kbps, , Dual RS-232 Transceivers with Internal CapacitorsT_IN, FORCEON,FORCEOFFVCC= , MAX3235 EVCC= , MAX3233 EMAX3233E/MAX3235E_____ 3 ELECTRICAL CHARACTERISTICS (continued)(VCC= + to + for MAX3233E, VCC= + to + for MAX3235E; TA= TMINto TMAX, unless otherwise noted. Typical val-ues are at TA= +25 C.)

9 CONDITIONS 30010 MOutput ResistanceV 5 Voltage SwingUNITSMINTYPMAXSYMBOLPARAMETERF igure 3as153060tAUTOSHDNR eceiver or Transmitter Edge toTransmitters Shut Down s100tWUReceiver or Transmitter Edge toTransmitters Enabled s1tINVHR eceiver Positive or NegativeThreshold to INVALIDHighVVCC - , Output Voltage Voltage Input Threshold toINVALIDO utput Input Threshold toINVALIDO utput High 15 8R_IN, T_OUTkV 15 A 25 Output Leakage Current 60mAOutput Short-Circuit CurrentVCC= V+ = V- = 0, transmitter outputs = 2 VAll transmitter outputs loaded with 3k togroundFigure 3b (Note 3)Figure 3b (Note 3)Figure 3bIOUT= 3aHuman Body ModelVOUT= 12V transmitters disabledIEC1000-4-2 Contact DischargeIEC1000-4-2 Air DischargeVCC= 0 or + (MAX3235E)VCC= 0 or + (MAX3233E)

10 15kv ESD- protected , 1 A, 250kbps, , Dual RS-232 Transceivers with Internal Capacitors 25 MAX3233 EMAX3235E50 s70tINVLR eceiver Positive or NegativeThreshold to INVALIDLowFigure 3bTRANSMITTER OUTPUTSESD PROTECTIONAutoShutdown PLUS(FORCEON = GND, FORCEOFF= VCC)Positive thresholdNegative thresholdNote 3:A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic CHARACTERISTICS (VCC= + to + for MAX3233E, VCC= + to + for MAX3235E; TA= TMINto TMAX, unless otherwise noted. Typical val-ues are at TA= +25 C.)