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MAXIM MAX3221 MAX3223 MAX3243 说明书

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_______________General Description

The MAX3221/MAX3223/MAX3243 achieve 1µA supply

current with Maxim’s revolutionary AutoShutdown™ fea-

ture. 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 input. As a result, the system

saves power without changes to the existing BIOS or

operating system.

The MAX3221/MAX3223/MAX3243 transceivers are 3V-

powered EIA/TIA-232 and V.28/V.24 communications

interfaces intended for notebook computer applica-

tions. A proprietary, high-efficiency, dual charge-pump

power supply and a low-dropout transmitter combine to

deliver 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 0.1µF

capacitors in 3.3V operation, and can operate from input

voltages ranging from +3.0V to +5.5V. They are ideal for

3.3V-only systems, mixed 3.3V and 5.0V systems, or

5.0V-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). The

MAX3243 3-driver/5-receiver, complete serial port is

ideal for notebook or subnotebook computers. The

MAX3243 includes one complementary always-active

receiver. 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 V

CC

completely removed.Next Generation Device Features

♦For Space-Constrained Applications:

MAX3228/MAX3229: +2.5V to +5.5V RS-232

Transceivers 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-232

Transceivers (MAX3246E Available in UCSP

Package)

♦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

________________________Applications

Notebook, Subnotebook, and Palmtop Computers

Battery-Powered Equipment

Hand-Held Equipment

Peripherals

Printers

MAX3221/MAX3223/MAX3243*1µA Supply-Current, True +3V to +5.5V

RS-232 Transceivers with AutoShutdown

________________________________________________________________Maxim Integrated Products

119-0306; Rev 8; 10/03

PART

MAX3221CAE

MAX3221EUE†-40°C to +85°C0°C to +70°CTEMP RANGEPIN-PACKAGE

16 SSOP

16 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 Integrated

Products, Inc.Pin Configurations appear at end of data sheet.

Typical Operating Circuits appear at end of data sheet.MAX3223EPP-40°C to +85°C20 Plastic DIP

MAX3223EAP-40°C to +85°C20 SSOP

MAX3243CWI0°C to +70°C28 Wide SO

MAX3243CAI0°C to +70°C28 SSOP

MAX3243EWI-40°C to +85°C28 Wide SO

MAX3243EAI-40°C to +85°C28 SSOPMAX3223CPP

MAX3223CAP0°C to +70°C0°C to +70°C20 Plastic DIP

20 SSOP______________Ordering Information

_____________________Selector Guide

MAX3221

MAX3223

MAX32431

2

31

23.0 to 5.5

3.0 to 5.5

3.0 to 5.55Yes

Yes

YesPARTTxRxV

CCRANGE (V)AutoShutdownMAX3221CUE†0°C to +70°C16 TSSOP

MAX3221EAE-40°C to +85°C16 SSOP

MAX3223CUP0°C to +70°C20 TSSOP

MAX3223EUP-40°C to +85°C20 TSSOP

MAX3243CUI0°C to +70°C28 TSSOP

MAX3243EUI-40°C to +85°C28 TSSOP

For 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 +5.5V

RS-232 Transceivers with AutoShutdown

2

_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

CC= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T

A= T

MINto T

MAX, unless otherwise noted. Typical values are at T

A= +25°C.)Stresses 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 reliability.V

CC...........................................................................-0.3V to +6V

V+ (Note 1)...............................................................-0.3V to +7V

V- (Note 1)...............................................................+0.3V to -7V

V+ + |

V-|

(Note 1).................................................................+13V

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MAX213ECWI中文资料

MAX213ECWI中文资料

________________________________________________________________Maxim Integrated Products

1General Description

The MAX202E–MAX213E, MAX232E/MAX241E linedrivers/receivers are designed for RS-232 and V.28communications in harsh environments. Each transmitteroutput and receiver input is protected against ±15kVelectrostatic discharge (ESD) shocks, without latchup.The various combinations of features are outlined in theSelector Guide.The drivers and receivers for all tendevices meet all EIA/TIA-232E and CCITT V.28specifications at data rates up to 120kbps, when loadedin accordance with the EIA/TIA-232E specification.

The MAX211E/MAX213E/MAX241E are available in 28-pin SO packages, as well as a 28-pin SSOP that uses60% less board space. The MAX202E/MAX232E comein 16-pin TSSOP, narrow SO, wide SO, and DIPpackages. The MAX203E comes in a 20-pin DIP/SOpackage, and needs no external charge-pumpcapacitors. The MAX205E comes in a 24-pin wide DIPpackage, and also eliminates external charge-pumpcapacitors. The MAX206E/MAX207E/MAX208E come in24-pin SO, SSOP, and narrow DIP packages. TheMAX232E/MAX241E operate with four 1µF capacitors,while the MAX202E/MAX206E/MAX207E/MAX208E/MAX211E/MAX213E operate with four 0.1µF capacitors,further reducing cost and board space.________________________Applications

MAX3232ECUE+中文资料

MAX3232ECUE+中文资料

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim's website at .General Description

The MAX3222E/MAX3232E/MAX3237E/MAX3241E/

MAX3246E +3.0V-powered EIA/TIA-232 and V.28/V.24

communications interface devices feature low power con-

sumption, high data-rate capabilities, and enhanced

electrostatic-discharge (ESD) protection. The enhanced

ESD structure protects all transmitter outputs and

receiver inputs to ±15kV using IEC 1000-4-2 Air-Gap

Discharge, ±8kV using IEC 1000-4-2 Contact Discharge

(±9kV for MAX3246E), and ±15kV using the Human Body

Model. The logic and receiver I/O pins of the MAX3237E

are protected to the above standards, while the transmit-

ter output pins are protected to ±15kV using the Human

Body Model.

A proprietary low-dropout transmitter output stage delivers

MAX3222EEUP资料

MAX3222EEUP资料

General Description

The MAX3222E/MAX3232E/MAX3237E/MAX3241E/

MAX3246E +3.0V-powered EIA/TIA-232 and V.28/V.24

communications interface devices feature low power con-

sumption, high data-rate capabilities, and enhanced

electrostatic-discharge (ESD) protection. The enhanced

ESD structure protects all transmitter outputs and

receiver inputs to ±15kV using IEC 1000-4-2 Air-Gap

Discharge, ±8kV using IEC 1000-4-2 Contact Discharge

(±9kV for MAX3246E), and ±15kV using the Human Body

Model. The logic and receiver I/O pins of the MAX3237E

are protected to the above standards, while the transmit-

ter output pins are protected to ±15kV using the Human

Body Model.

A proprietary low-dropout transmitter output stage delivers

true RS-232 performance from a +3.0V to +5.5V power

supply, using an internal dual charge pump. The charge

MAX3232EEUE中文资料

MAX3232EEUE中文资料

General Description

The MAX3222E/MAX3232E/MAX3237E/MAX3241E/

MAX3246E +3.0V-powered EIA/TIA-232 and V.28/V.24

communications interface devices feature low power con-

sumption, high data-rate capabilities, and enhanced

electrostatic-discharge (ESD) protection. The enhanced

ESD structure protects all transmitter outputs and

receiver inputs to ±15kV using IEC 1000-4-2 Air-Gap

Discharge, ±8kV using IEC 1000-4-2 Contact Discharge

(±9kV for MAX3246E), and ±15kV using the Human Body

Model. The logic and receiver I/O pins of the MAX3237E

are protected to the above standards, while the transmit-

ter output pins are protected to ±15kV using the Human

Body Model.

A proprietary low-dropout transmitter output stage delivers

true RS-232 performance from a +3.0V to +5.5V power

supply, using an internal dual charge pump. The charge