________________General DescriptionThe MAX3233E/MAX3235E are EIA/TIA-232 and V.28/V.24communications 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 +3.3V supply; the MAX3235E operates from +5.0V.All devices achieve a 1µA supply current using Maxim’srevolutionary AutoShutdown Plus™ feature. 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 UARTdriving the transmitter inputs is inactive for more than30 seconds. They turn on again when they sense avalid transition at any transmitter or receiver input.AutoShutdown Plus saves power without changes tothe existing BIOS or operating system.The MAX3233E/MAX3235E have internal dual chargepumps requiring no external capacitors. Both trans-ceivers have a proprietary low-dropout transmitter out-put stage that enables true RS-232 performance from a+3.0V to +3.6V supply for the MAX3233E or a +4.5V to+5.5V 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 DIPpackages.________________________ApplicationsSubnotebook and Palmtop ComputersCellular PhonesBattery-Powered EquipmentHand-Held 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♦ 1µA Supply Current♦ AutoShutdown Plus—1997 EDN MagazineInnovation of the Year♦ Single-Supply Operation +3.0V to +3.6V (MAX3233E)+4.5V to +5.5V (MAX3235E)♦ 250kbps Guaranteed Data Rate♦ 6V/µs Guaranteed Slew Rate♦ Meets EIA/TIA-232 Specifications Down to 3.0V(MAX3233E)♦ Internal Charge-Pump CapacitorsMAX3233E†/MAX3235E†±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors________________________________________________________________ Maxim Integrated Products 119-1473; Rev 1; 5/00PARTMAX3233ECWP0°C to +70°CTEMP. RANGE PIN-PACKAGE20 SOAutoShutdown Plus is a trademark of Maxim Integrated Products._______________Ordering InformationOrdering Information continued at end of data sheet.MAX3233EMAX3235E1213141516171841R2OUT R2INT2OUTGNDV-C2-C2+C1-C1+V+V+INVALIDT2INT1INFORCEONR1OUTT1OUTR1INVCCFORCEOFF291056783192011CHARGEPUMPSO/DIPPin Configuration/ Functional DiagramTypical Operating Circuit appears at end of data sheet.MAX3233ECPP 0°C to +70°C 20 Plastic DIPMAX3233EEPP -40°C to +85°C 20 Plastic DIPMAX3233EEWP -40°C to +85°C 20 SO†Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577;4,797,899; 4,809,152; 4,897,774; 4,999,761; 5,649,210; and otherpatents pending.For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,or visit Maxim’s website at www.maxim-ic.com.MAX3233E/MAX3235E2 _______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(VCC= +3.0V to +3.6V for MAX3233E, VCC= +4.5V to +5.5V 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. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.VCCto GND (MAX3233E).........................................-0.3V to +4VVCCto GND (MAX3235E).........................................-0.3V to +6VV+ to GND (Note 1) ..................................................-0.3V to +7VV- to GND (Note 1) ...................................................+0.3V to -7VV+ + |V-| (Note 1).................................................................+13VInput VoltagesT_IN, FORCEON, FORCEOFF to GND....................-0.3V to +6VR_IN to GND ...................................................................±25VOutput VoltagesT_OUT to GND.............................................................±13.2VR_OUT, INVALID to GND ......................-0.3V to (VCC+ 0.3V)Short-Circuit DurationT_OUT to GND ......................................................ContinuousContinuous Power Dissipation (TA= +70°C)Wide SO (derate 10mW/°C above +70°C)..................800mWPlastic DIP (derate 11.11mW/°C above +70°C) .........889mWOperating Temperature RangesMAX323_EC_P...................................................0°C to +70°CMAX323_EE_P ................................................-40°C to +85°CStorage Temperature Range .............................-65°C to +150°CLead Temperature (soldering, 10s) .................................+300°CNote 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.FORCEON = GND, FORCEOFF = VCC,all R_IN idle, all T_IN idleTA= +25°CCONDITIONSkΩ357Input ResistanceV0.5Input Hysteresis1.8 2.4V1.5 2.4Input Threshold High0.8 1.3V0.6 1.0Input Threshold LowV-25 +25Input Voltage RangeVVCC- 0.6 VCC- 0.1Output Voltage HighV0.4Output Voltage LowµA110Supply Current, ShutdownµA110Supply Current,AutoShutdown PlusµA±0.01 ±1Transmitter Input Hysteresis V0.5V2.4Input Logic Threshold HighmA0.3 1Supply Current, AutoShutdown Plus DisabledV0.8Input Logic Threshold Low2UNITSMIN TYP MAXSYMBOLPARAMETERFORCEOFF = GNDTA= +25°CT_IN, FORCEON, FORCEOFFFORCEON = FORCEOFF = VCC, no loadT_IN, FORCEON, FORCEOFFIOUT= -1.0mAIOUT= 1.6mAInput Leakage CurrentDC CHARACTERISTICS (VCC= 3.3V for MAX3233E, VCC= 5.0V for MAX3235E, TA= +25°C.)LOGIC INPUTS AND RECEIVER OUTPUTSRECEIVER INPUTSTA= +25°CVCC= 5.0V, MAX3235EVCC= 3.3V, MAX3233EVCC= 5.0V, MAX3235EVCC= 3.3V, MAX3233E±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal CapacitorsT_IN, FORCEON,FORCEOFFVCC= 5.0V, MAX3235EVCC= 3.3V, MAX3233EMAX3233E/MAX3235E_______________________________________________________________________________________ 3ELECTRICAL
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