MAX3221EUE+中文资料

19-0306; Rev 8; 10/03

RS-232 Transceivers with AutoShutdown

1µA Supply-Current, True +3V to +5.5V_______________General Description

The MAX3221/MAX3223/MAX3243 achieve 1µA supplycurrent with Maxim’s revolutionary AutoShutdown fea- For Space-Constrained Applications:

ture. When the MAX3221/MAX3223/MAX3243 do notMAX3228/MAX3229: +2.5V to +5.5V RS-232sense a valid signal level on their receiver inputs, theTransceivers in UCSP on-board power supply and drivers shut down. This For Integrated ESD Protection:

occurs if the RS-232 cable is disconnected or if theMAX3222E/MAX3232E/MAX3237E/MAX3241E*/transmitters of the connected peripheral are turned off.The system turns on again when a valid level is appliedMAX3246E: ±15kV ESD-Protected, Down to 10nA,to any RS-232 receiver input. As a result, the system3.0V to 5.5V, Up to 1Mbps, True RS-232

saves power without changes to the existing BIOS orTransceivers (MAX3246E Available in UCSPoperating system.

Package)The MAX3221/MAX3223/MAX3243 transceivers are 3V- For Low-Voltage or Data Cable Applications:powered EIA/TIA-232 and V.28/V.24 communicationsMAX3380E/MAX3381E: +2.5V to +5.5V, 1µA, interfaces intended for notebook computer applica-2 Tx/2 Rx RS-232 Transceivers with ±15kV ESD-tions. A proprietary, high-efficiency, dual charge-pumpProtected I/O and Logic Pins

power 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.

________________________Applications

The MAX3221/MAX3223/MAX3243 require only 0.1µFcapacitors in 3.3V operation, and can operate from inputNotebook, Subnotebook, and Palmtop Computersvoltages ranging from +3.0V to +5.5V. They are ideal forBattery-Powered Equipment3.3V-only systems, mixed 3.3V and 5.0V systems, or5.0V-only systems that require true RS-232 performance.Hand-Held EquipmentThe MAX3221 is a 1-driver/1-receiver 16-pin SSOP ver-Peripheralssion of the 20-pin MAX3223 (2-driver/2-receiver). ThePrinters

MAX3243 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 Vcompletely removed.

CC_____________________Selector Guide

Pin Configurations appear at end of data sheet.Typical Operating Circuits appear at end of data sheet. Future product—contact factory for availability.

AutoShutdown and UCSP are trademarks of Maxim IntegratedProducts, Inc.

* 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.

________________________________________________________________Maxim Integrated Products

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For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at http://www.77cn.com.cn.

MAX3221/MAX3223/MAX3243*

1µA Supply-Current, True +3V to +5.5VRS-232 Transceivers with AutoShutdownMAX3221/MAX3223/MAX3243

ABSOLUTE MAXIMUM RATINGS

VCC...........................................................................-0.3V to +6VV+ (Note 1)...............................................................-0.3V to +7VV- (Note 1)...............................................................+0.3V to -7VV+ + |V-|(Note 1).................................................................+13VInput Voltages

T_IN, FORCEOFF, FORCEON, EN(MAX3223)......-0.3V to +6VR_IN...................................................................................±25VOutput Voltages

T_OUT.............................................................................±13.2VR_OUT, INVALID......................................-0.3V to (VCC+ 0.3V)Short-Circuit Duration

T_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 Ranges

MAX32_ _C_ _.......................................................0°C to +70°CMAX32_ _E_ _....................................................-40°C to +85°CStorage Temperature Range.............................-65°C to +150°CLead Temperature (soldering, 10s).................................+300°C

Note 1:V+ and V- can have maximum magnitudes 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.

ELECTRICAL 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.)

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