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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

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 1

19-0306; Rev 8; 10/03

PART

MAX3221CAE

MAX3221EUE†

-40°C to +85°C

0°C to +70°C

TEMP RANGE PIN-PACKAGE

16 SSOP

16 TSSOP

* .

†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°C 20 Plastic DIP

MAX3223EAP -40°C to +85°C 20 SSOP

MAX3243CWI

0°C to +70°C 28 Wide SO

MAX3243CAI 0°C to +70°C 28 SSOP

MAX3243EWI -40°C to +85°C 28 Wide SO

MAX3243EAI -40°C to +85°C 28 SSOP

MAX3223CPP

MAX3223CAP 0°C to +70°C

0°C to +70°C 20 Plastic DIP

20 SSOP

______________Ordering Information

_____________________Selector Guide

MAX3221

MAX3223

MAX3243

3.0 to 5.5

3.0 to 5.55

Yes

PART Tx Rx V

RANGE (V) AutoShutdown

MAX3221CUE†

0°C to +70°C 16 TSSOP

MAX3221EAE -40°C to +85°C 16 SSOP

MAX3223CUP 0°C to +70°C 20 TSSOP

MAX3223EUP -40°C to +85°C 20 TSSOP

MAX3243CUI 0°C to +70°C 28 TSSOP

MAX3243EUI -40°C to +85°C 28 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.

Summary of content (16 pages)

PAGE 1
9-0306; Rev 8; 10/03 1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown The MAX3221/MAX3223/MAX3243 achieve 1µA supply current with Maxim’s revolutionary AutoShutdown™ feature. 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.
PAGE 2
MAX3221/MAX3223/MAX3243 1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown ABSOLUTE MAXIMUM RATINGS VCC ...........................................................................-0.3V to +6V V+ (Note 1) ...............................................................-0.3V to +7V V- (Note 1) ...............................................................+0.3V to -7V V+ + |V-| (Note 1).................................................................
PAGE 3
1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown (VCC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER CONDITIONS MIN TYP MAX UNITS 25 V RECEIVER INPUTS Input Voltage Range -25 Input Threshold Low TA = +25°C Input Threshold High TA = +25°C VCC = 3.3V 0.6 1.2 VCC = 5.0V 0.8 1.5 V VCC = 3.3V 1.5 2.4 VCC = 5.0V 1.8 2.4 Input Hysteresis 0.
PAGE 4
__________________________________________Typical Operating Characteristics (VCC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ, TA = +25°C, unless otherwise noted.) 20 18 SLEW RATE (V/µs) 4 3 2 1 0 -1 -2 -3 MAX3221/3223-02 VOUT+ 16 14 -SLEW 12 10 +SLEW 8 6 -4 4 VOUT- FOR DATA RATES UP TO 235kbps 35 35 30 235kbps 30 25 25 20 120kbps 20 15 15 10 20kbps 10 5 2 1000 2000 3000 4000 4000 MAX3243 TRANSMITTER OUTPUT VOLTAGE vs.
PAGE 5
1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown PIN NAME FUNCTION — EN Receiver Enable Control. Drive low for normal operation. Drive high to force the receiver outputs into a high-Z state.
PAGE 6
MAX3221/MAX3223/MAX3243 1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown POWER MANAGEMENT UNIT OR KEYBOARD CONTROLLER VCC FORCEOFF FORCEON INVALID PROTECTION DIODE MAX3243 PREVIOUS RS-232 VCC I Rx 5kΩ UART Tx CPU I/O CHIP WITH UART GND SHDN = GND RS-232 (a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE RECEIVER OUTPUT IN SHUTDOWN. VCC TO µP LOGIC TRANSITION DETECTOR Figure 1.
PAGE 7
1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown FORCEOFF EN T_OUT 0 0 High-Z R_OUT Active 0 1 High-Z 1 0 Active* High-Z Active 1 1 Active* High-Z MAX3221/MAX3223/MAX3243 Table 1a. MAX3221/MAX3223 FORCEOFF and Enable Control Truth Table +0.3V R_IN 30µs COUNTER R -0.3V TO MAX32_ _ POWER SUPPLY AND TRANSMITTERS INVALID * TRANSMITTERS ARE DISABLED, REDUCING SUPPLY CURRENT TO 1µA IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30µs.
PAGE 8
Table 2. AutoShutdown Logic RS-232 SIGNAL PRESENT AT RECEIVER INPUT FORCEOFF INPUT FORCEON INPUT INVALID OUTPUT Yes H X H Normal Operation No H H L Normal Operation (Forced On) No H L L Shutdown (AutoShutdown) Yes L X H Shutdown (Forced Off) No L X L Shutdown (Forced Off) other system to realize that the MAX3221/MAX3223/ MAX3243 is awake. If the other system outputs valid RS-232 signals within that time, the RS-232 ports on both systems remain enabled.
PAGE 9
2V/div T1 50µs/div 4 3 T1 0 -1 T2 VOUT+ -2 -3 VCC VOUT- T3 VOUT- -4 -5 -6 0 VCC = +3.3V C1–C4 = 0.1µF VOUT+ VCC = 3.0V 2 1 MAX3222-04 T2 6 5 1 2 3 4 5 6 7 LOAD CURRENT PER TRANSMITTER (mA) Figure 6. Transmitter Outputs when Exiting Shutdown or Powering Up Power-Supply Decoupling In most circumstances a 0.1µF bypass capacitor is adequate.
PAGE 10
MAX3221/MAX3223/MAX3243 1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown +3.3V 26 0.1µF 28 C1 0.1µF 24 1 C2 0.1µF 2 LOGIC INPUTS VCC 27 C1+ V+ C3 0.1µF C1C2+ COMPUTER SERIAL PORT 3 MAX3243 V- C4 0.
PAGE 11
1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown VCC VCC (V) 0.1µF VCC C1+ V+ C3 C1 C1 (µF) C2, C3, C4 (µF) 3.0 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.1 0.47 C1C2+ MAX3221 MAX3223 MAX3243 C2 C2- R_ IN R_ OUT VCC C4 T_ OUT T_ IN 0V V- EN (MAX3221/3) FORCEOFF 5kΩ Table 4. Logic Family Compatibility with Various Supply Voltages SYSTEM POWERSUPPLY VOLTAGE (V) VCC SUPPLY VOLTAGE (V) 3.3 3.3 5 5 5 3.
PAGE 12
MAX3221/MAX3223/MAX3243 1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown __________________________________________________Typical Operating Circuits +3.3V 15 0.1µF C5 2 C1+ C1 0.1µF 4 C15 C2 0.1µF 6 VCC 3 V+ MAX3221 C2+ V- C3 0.1µF 28 C1+ C1 0.1µF 24 T1OUT 13 1 C2 0.1µF R1IN 8 9 R1OUT 2 5kΩ INVALID 10 1 EN 12 FORCEOFF 16 FORCEON GND 26 0.1µF C4 0.1µF C2- 11 T1IN +3.3V 7 TO POWER MANAGEMENT UNIT LOGIC INPUTS VCC 27 V+ C3 0.
PAGE 13
1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown PART POWERSUPPLY VOLTAGE (V) No. OF TRANSMITTERS/ RECEIVERS No. OF RECEIVERS ACTIVE IN SHUTDOWN GUARANTEED DATA RATE (kbps) EIA/TIA232 OR 562 MAX212 3.0 to 3.6 3/5 5 120 232 Drives mice MAX218 1.8 to 4.25 2/2 2 120 232 Operates directly from batteries without a voltage regulator MAX562 MAX563 2.7 to 5.25 3.0 to 3.6 3/5 2/2 5 2 230 120 562 562 230kbps guaranteed data rate 0.1µF capacitors MAX3212 2.
PAGE 14
MAX3221/MAX3223/MAX3243 1µA Supply-Current, True +3V to +5.
PAGE 15
1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown SSOP.EPS 2 1 INCHES E H MILLIMETERS DIM MIN MAX MIN MAX A 0.068 0.078 1.73 1.99 A1 0.002 0.008 0.05 0.21 B 0.010 0.015 0.25 0.38 C D 0.20 0.09 0.004 0.008 SEE VARIATIONS E 0.205 e 0.212 0.0256 BSC 5.20 MILLIMETERS INCHES D D D D D 5.38 MIN MAX MIN MAX 0.239 0.239 0.278 0.249 0.249 0.289 6.07 6.07 7.07 6.33 6.33 7.33 0.317 0.397 0.328 0.407 8.07 10.07 8.33 10.
PAGE 16
Package Information (continued) INCHES N E DIM A A1 B C e E H L H MAX MIN 0.093 0.104 0.004 0.012 0.014 0.019 0.009 0.013 0.050 0.291 0.299 0.394 0.419 0.050 0.016 SOICW.EPS (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) MILLIMETERS MIN 2.35 0.10 0.35 0.23 MAX 2.65 0.30 0.49 0.32 1.27 7.40 7.60 10.00 10.65 0.40 1.