_______________General DescriptionThe MAX3221/MAX3223/MAX3243 achieve 1µA supplycurrent with Maxim’s revolutionary AutoShutdown™ fea-ture. When the MAX3221/MAX3223/MAX3243 do notsense a valid signal level on their receiver inputs, theon-board power supply and drivers shut down. Thisoccurs if the RS-232 cable is disconnected or if thetransmitters of the connected peripheral are turned off.The system turns on again when a valid level is appliedto any RS-232 receiver input. As a result, the systemsaves power without changes to the existing BIOS oroperating system.The MAX3221/MAX3223/MAX3243 transceivers are 3V-powered EIA/TIA-232 and V.28/V.24 communicationsinterfaces intended for notebook computer applica-tions. A proprietary, high-efficiency, dual charge-pumppower supply and a low-dropout transmitter combine todeliver true RS-232 performance from a single +3.0V to+5.5V supply. A guaranteed data rate of 120kbps pro-vides compatibility with popular software for communi-cating with personal computers.The MAX3221/MAX3223/MAX3243 require only 0.1µFcapacitors in 3.3V operation, and can operate from inputvoltages ranging from +3.0V to +5.5V. They are ideal for3.3V-only systems, mixed 3.3V and 5.0V systems, or5.0V-only systems that require true RS-232 performance.The MAX3221 is a 1-driver/1-receiver 16-pin SSOP ver-sion of the 20-pin MAX3223 (2-driver/2-receiver). TheMAX3243 3-driver/5-receiver, complete serial port isideal for notebook or subnotebook computers. TheMAX3243 includes one complementary always-activereceiver. This receiver can monitor an external device(such as a modem) in shutdown, without forward bias-ing the protection diodes in a UART that may have VCCcompletely removed.Next Generation Device Features♦ For Space-Constrained Applications:MAX3228/MAX3229: +2.5V to +5.5V RS-232Transceivers in UCSP™♦ For Integrated ESD Protection:MAX3222E/MAX3232E/MAX3237E/MAX3241E*/MAX3246E: ±15kV ESD-Protected, Down to 10nA,3.0V to 5.5V, Up to 1Mbps, True RS-232Transceivers (MAX3246E Available in UCSPPackage)♦ For Low-Voltage or Data Cable Applications:MAX3380E/MAX3381E: +2.5V to +5.5V, 1µA, 2 Tx/2 Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins________________________ApplicationsNotebook, Subnotebook, and Palmtop ComputersBattery-Powered EquipmentHand-Held EquipmentPeripheralsPrintersMAX3221/MAX3223/MAX3243*1µA Supply-Current, True +3V to +5.5VRS-232 Transceivers with AutoShutdown________________________________________________________________ Maxim Integrated Products 119-0306; Rev 8; 10/03PARTMAX3221CAEMAX3221EUE†-40°C to +85°C0°C to +70°CTEMP RANGE PIN-PACKAGE16 SSOP16 TSSOP* 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; and other patents pending.†Future product—contact factory for availability.AutoShutdown and UCSP are trademarks of Maxim IntegratedProducts, Inc.Pin Configurations appear at end of data sheet.Typical Operating Circuits appear at end of data sheet.MAX3223EPP -40°C to +85°C 20 Plastic DIPMAX3223EAP -40°C to +85°C 20 SSOPMAX3243CWI0°C to +70°C 28 Wide SOMAX3243CAI 0°C to +70°C 28 SSOPMAX3243EWI -40°C to +85°C 28 Wide SOMAX3243EAI -40°C to +85°C 28 SSOPMAX3223CPPMAX3223CAP 0°C to +70°C0°C to +70°C 20 Plastic DIP20 SSOP______________Ordering Information_____________________Selector GuideMAX3221MAX3223MAX3243123123.0 to 5.53.0 to 5.53.0 to 5.55YesYesYesPART Tx Rx VCCRANGE (V) AutoShutdownMAX3221CUE†0°C to +70°C 16 TSSOPMAX3221EAE -40°C to +85°C 16 SSOPMAX3223CUP 0°C to +70°C 20 TSSOPMAX3223EUP -40°C to +85°C 20 TSSOPMAX3243CUI 0°C to +70°C 28 TSSOPMAX3243EUI -40°C to +85°C 28 TSSOPFor pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.MAX3221/MAX3223/MAX32431µA Supply-Current, True +3V to +5.5VRS-232 Transceivers with AutoShutdown2 _______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), TA= TMINto TMAX, unless otherwise noted. Typical values 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.VCC...........................................................................-0.3V to +6VV+ (Note 1)...............................................................-0.3V to +7VV- (Note 1) ...............................................................+0.3V to -7VV+ + |V-| (Note 1).................................................................+13VInput VoltagesT_IN, FORCEOFF, FORCEON, EN (MAX3223) ......-0.3V to +6VR_IN ...................................................................................±25VOutput VoltagesT_OUT.............................................................................±13.2VR_OUT, INVALID ......................................-0.3V to (VCC+ 0.3V)Short-Circuit DurationT_OUT ......................................................................ContinuousContinuous Power Dissipation (TA= +70°C)16-Pin SSOP (derate 7.14mW/°C above +70°C) ...........571mW16-Pin TSSOP (derate 6.70mW/°C above +70°C) .........533mW20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW20-Pin SSOP (derate 8.00mW/°C above +70°C) ...........640mW20-Pin TSSOP DIP (derate 7.00mW/°C above +70°C).....559mW28-Pin Wide SO (derate 12.50mW/°C above +70°C) ............1W28-Pin SSOP (derate 9.52mW/°C above +70°C) ...........762mW28-Pin TSSOP (derate 8.70mW/°C above +70°C) .........696mWOperating Temperature RangesMAX32_ _C_ _.......................................................0°C to +70°CMAX32_ _E_ _....................................................-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.IOUT= 1.6mAReceivers disabledT_IN, EN, FORCEON, FORCEOFFT_IN, EN, FORCEON, FORCEOFFT_IN, FORCEON, FORCEOFF, EN (MAX3223)IOUT=