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MAX3243EAI+ |MAX3243EAIMAXN/a13avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243EAI+ |MAX3243EAIMAXIMN/a1870avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243EAI+TMAXIMN/a4000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243ECAI+ |MAX3243ECAIMAXIMN/a700avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243ECAI+T |MAX3243ECAITMAXN/a2000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243ECAI-T |MAX3243ECAITMAXIMN/a2977avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243ECUIMAXN/a352avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243ECUIMAXIN/a74avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243ECUI+ |MAX3243ECUIMAXIMN/a320avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243ECUI+T |MAX3243ECUITMAXIMN/a138avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243ECWI+MAIXMN/a2500avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243EEAI+ |MAX3243EEAIMAXN/a260avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243EEAI+T |MAX3243EEAITMAXIMN/a4816avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243EEAI-T |MAX3243EEAITMAXIMN/a360avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243EEUIMAXIMN/a5000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243EEWI+TMAXIMN/a5000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243EUI+ |MAX3243EUIMAXN/a60avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3243EUI-T |MAX3243EUITMAXIMN/a1855avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EAE+ |MAX3221EAEMAXIMN/a1000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EAE+T |MAX3221EAETMAXIM N/a12000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EAE-T |MAX3221EAETMAXN/a8000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221ECAE+ |MAX3221ECAEMAXN/a200avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221ECAE+T |MAX3221ECAETMAXIMN/a30000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221ECAE+TMAXIM/PBFN/a10avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221ECAE+T |MAX3221ECAETMAXN/a1295avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221ECAE-T |MAX3221ECAETMAXIMN/a1101avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221ECAE-T |MAX3221ECAETMAXN/a2000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221ECTE+ |MAX3221ECTEMAXIMN/a80avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221ECUEMAXIMN/a4700avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221ECUE+ |MAX3221ECUEMAXN/a130avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221ECUE+T |MAX3221ECUETMAXIMN/a1018avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EEAE+ |MAX3221EEAEMAXIMN/a64avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EEAE+ |MAX3221EEAEMAXN/a410avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EEAE+T |MAX3221EEAETMAXN/a4000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EEAE+T |MAX3221EEAETMAXIMN/a13800avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EEAE-T |MAX3221EEAETMAX ?N/a1149avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EEAE-T |MAX3221EEAETMAXIMN/a148avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EEAE-T |MAX3221EEAETMAXN/a334avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EETE+ |MAX3221EETEMAXIMN/a500avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EETE+T |MAX3221EETETMAXIM N/a5000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EEUEMAXIMN/a4700avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EEUE+ |MAX3221EEUEMAXN/a1000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EEUE+T |MAX3221EEUETMAXIM N/a5000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EUE+ |MAX3221EUEMAXIMN/a3184avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EUE+ |MAX3221EUEMAXN/a420avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3221EUE+T |MAX3221EUETMAXIMN/a10000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223EAP+ |MAX3223EAPMAXN/a440avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223EAP+MAXIMN/a46avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223EAP+T |MAX3223EAPTMAXIMN/a8000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223ECAP+ |MAX3223ECAPMAXIMN/a1862avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223ECAP+T |MAX3223ECAPTMAIXMN/a958avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223ECPP+ |MAX3223ECPPMAXIMN/a386avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223ECTP+ |MAX3223ECTPMAXIMN/a50avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223ECUPMAXIMN/a776avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223ECUP+ |MAX3223ECUPMAXN/a49avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223ECUP+T |MAX3223ECUPTMAXIMN/a5000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223EEAP+ |MAX3223EEAPMAXN/a80avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223EEAP+T |MAX3223EEAPTMAXIMN/a10000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223EEAP+T |MAX3223EEAPTMAIXMN/a317avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223EEAP-T |MAX3223EEAPTMAXIMN/a1182avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223EEPP+ |MAX3223EEPPMAXIMN/a1000avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223EETP+MAXIMN/a136avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223EEUP+ |MAX3223EEUPMAXN/a230avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223EEUP+T |MAX3223EEUPTMAXIMN/a1430avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223EPP+ |MAX3223EPPMAXIMN/a891avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223EUP+ |MAX3223EUPMAXN/a131avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
MAX3223EUP+TMAXIMN/a777avai±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown


MAX3221ECAE+T ,±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdownfeatures, high data- to +5.5V RS-232 Transceivers in UCSP™rate capabilities, and enhanced electrost ..
MAX3221ECAE+T ,±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdownFeaturesThe MAX3221E/MAX3223E/MAX3243E are 3V-powered ♦ For Space-Constrained
MAX3221ECAE+T ,±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdownELECTRICAL CHARACTERISTICS(V = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T = T to T , unless otherwis ..
MAX3221ECAE-T ,±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdownApplications:EIA/TIA-232 and V.28/V.24 communications interfaces MAX3228E/MAX3229E: ±15kV ESD-Prote ..
MAX3221ECAE-T ,±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdownFeaturesThe MAX3221E/MAX3223E/MAX3243E are 3V-powered ♦ For Space-Constrained
MAX3221ECDB ,3-V to 5.5-V Single-Channel RS-232 Line Driver/Receiver 16-SSOP 0 to 70Electrical Characteristics: Auto-Power Down... 612.2 Community Resource........ 176.9 Switching Cha ..
MAX6501UKP065-T ,Low-cost, +2.7V to +5.5V micropower temperature switch. Output stage open-drain. Standard temperature threshold(C) +65.
MAX6501UKP075+T ,Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23
MAX6501UKP075-T ,Low-cost, +2.7V to +5.5V micropower temperature switch. Output stage open-drain. Standard temperature threshold(C) +75.
MAX6501UKP075-T ,Low-cost, +2.7V to +5.5V micropower temperature switch. Output stage open-drain. Standard temperature threshold(C) +75.
MAX6501UKP085 ,Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23
MAX6501UKP085+T ,Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23


MAX3221EAE+-MAX3221EAE+T-MAX3221EAE-T-MAX3221ECAE+-MAX3221ECAE+T-MAX3221ECAE-T-MAX3221ECTE+-MAX3221ECUE-MAX3221ECUE+-MAX3221ECUE+T-MAX3221EEAE+-MAX3221EEAE+T-MAX3221EEAE-T-MAX3221EETE+-MAX3221EETE+T-MAX3221EEUE-MAX3221EEUE+-MAX3221EEUE+T-MAX3221EUE+-MAX3221EUE+T-
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown
AVAILABLE
General Description

The MAX3221E/MAX3223E/MAX3243E are 3V-powered
EIA/TIA-232 and V.28/V.24 communications interfaces
with automatic shutdown/wakeup features, high data-
rate capabilities, and enhanced electrostatic discharge
(ESD) protection. All transmitter outputs and receiver
inputs are protected to ±15kV using IEC 1000-4-2 Air-
Gap Discharge, to ±8kV using IEC 1000-4-2 Contact
Discharge, and to ±15kV using the Human Body Model.
The MAX3221E/MAX3223E/MAX3243E achieve a
1µA supply current with Maxim’s revolutionary
AutoShutdown™ feature. They save power without
changes to the existing BIOS or operating system by enter-
ing low-power shutdown mode when the RS-232 cable is
disconnected, or when the transmitters of the connected
peripherals are off.
The transceivers have a proprietary low-dropout trans-
mitter output stage, delivering true RS-232 performance
from a +3.0V to +5.5V supply with a dual charge pump.
The charge pump requires only four small 0.1µF capaci-
tors for operation from a +3.3V supply. Each device is
guaranteed to run at data rates of 250kbps while main-
taining RS-232 output levels.
The MAX3221E contains just one driver and one receiver,
making it the smallest single-supply RS-232 transceiver.
The MAX3223E has two drivers and two receivers. The
MAX3243E is a complete 3-driver/5-receiver serial port
ideal for notebook or subnotebook computers. It also
includes two noninverting receiver outputs that are always
active, allowing external devices to be monitored without
forward biasing the protection diodes in circuitry that may
be powered down.
The MAX3221E, MAX3223E, and MAX3243E are avail-
able in space-saving TQFN, SSOP, and TSSOP pack-
ages.
Applications

Notebook, Subnotebook, and Palmtop Computers
Cellular Phones
Battery-Powered Equipment
Handheld Equipment
Peripherals
Printers
Next Generation Device Features
For Space-Constrained Applications:
MAX3228E/MAX3229E: ±15kV ESD-Protected, +2.5V
to +5.5V RS-232 Transceivers in UCSP™
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 a UCSP
Package)
For Data Cable Applications:
MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA,
2Tx/2Rx RS-232 Transceivers with ±15kV ESD-
Protected I/O and Logic Pins
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
Pin Configurations appear at end of data sheet.
Typical Operating Circuits appear at end of data sheet.

*Exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
Ordering Information continued at end of data sheet.
Ordering Information
Selector Guide
PART
NO. OF
DRIVERS/
RECEIVERS
VCC
RANGE
(V)
AutoShutdown

MAX3221E 1/1 +3.0 to +5.5 
MAX3223E 2/2 +3.0 to +5.5 
MAX3243E 3/5 +3.0 to +5.5 
PARTTEMP RANGEPIN-PACKAGE
MAX3221ECTE+
0°C to +70°C16 TQFN-EP*
MAX3221ECUE+0°C to +70°C16 TSSOP
MAX3221ECAE+0°C to +70°C16 SSOP
MAX3221EEAE+-40°C to +85°C16 SSOP
MAX3221EETE+-40°C to +85°C16 TQFN-EP*
MAX3221EEUE+-40°C to +85°C16 TSSOP
MAX3223ECPP+
0°C to +70°C20 PDIP
MAX3223ECAP+0°C to +70°C20 SSOP
MAX3223ECUP+0°C to +70°C20 TSSOP
MAX3223ECTP+0°C to +70°C20 TQFN-EP*
MAX3223EEPP+-40°C to +85°C20 PDIP
MAX3223EEAP+-40°C to +85°C20 SSOP
MAX3223EEUP+-40°C to +85°C20 TSSOP
MAX3223EETP+-40°C to +85°C20 TQFN-EP*
MAX3223EEUP/V+-40°C to +85°C20 TSSOP
MAX3221E/
MAX3223E/MAX3243E
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
ABSOLUTE MAXIMUM RATINGS
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.)
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.
VCCto GND..............................................................-0.3V to +6V
V+ to GND (Note 1)..................................................-0.3V to +7V
V- to GND (Note 1)...................................................+0.3V to -7V
V+ + |V-|(Note 1).................................................................+13V
Input Voltages
T_IN, EN, FORCEON, FORCEOFFto GND............-0.3V to +6V
R_IN to GND......................................................................±25V
Output Voltages
T_OUT to GND................................................................±13.2V
R_OUT, R2OUTB, INVALIDto GND.........-0.3V to (VCC+ 0.3V)
Short-Circuit Duration
T_OUT to GND.........................................................Continuous
Continuous Power Dissipation (TA= +70°C)
16-Pin SSOP (derate 7.14mW/°C above +70°C)...........571mW
16-Pin TSSOP (derate 9.4mW/°C above +70°C)........754.7mW
16-Pin TQFN (derate 20.8mW/°C above +70°C)......1666.7mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW
20-Pin SSOP (derate 8.00mW/°C above +70°C)...........640mW
20-Pin TSSOP (derate 10.9mW/°C above +70°C).........879mW
20-Pin TQFN (derate 21.3mW/°C above +70°C)......1702.1mW
28-Pin SSOP(derate 9.52mW/°C above +70°C)............762mW
28-Pin TSSOP (derate 12.8mW/°C above +70°C).......1026mW
32-Pin TQFN (derate 37mW/°C above +70°C)............2963mW
Operating Temperature Ranges
MAX32_ _EC_ _....................................................0°C to +70°C
MAX32_ _EE_ _..................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
Note 1:
V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
VCC= 5.0V
RECEIVER OUTPUTS
AutoShutdown (FORCEON = GND, FORCEOFF
= VCC)
LOGIC INPUTS
DC CHARACTERISTICS (VCC
= 3.3V or 5.0V, TA= +25°C)
R_OUT receivers disabledOutput Leakage Current±0.05±10µA
Negative threshold
Positive thresholdFigure 5a
VCC= 3.3VT_IN, EN, FORCEON,
FORCEOFF
CONDITIONS

IOUT= 1.6mA
Figure 5a
IOUT= -1.0mA
IOUT= 1.6mA
T_IN, EN, FORCEON, FORCEOFF
FORCEON = FORCEOFF= VCC,
no load
FORCEOFF= GND, all R_IN = GND
FORCEON = GND,
FORCEOFF= VCC, all R_IN open
-0.30.3VReceiver Input Threshold to
INVALIDOutput Low
0.4VINVALIDOutput Voltage Low
-2.7VReceiver Input Threshold to
INVALIDOutput High
0.31mASupply Current,
AutoShutdown Disabled
1.010µASupply Current, Shutdown
Supply Current, AutoShutdown
PARAMETERMINTYPMAXUNITS
Input Logic Threshold Low0.8V
1.010µA
Input Logic Threshold High2.4V
Output Voltage Low0.4V
Output Voltage HighVCC- 0.6VCC- 0.1V
SYMBOL

Transmitter Input Hysteresis0.5V
T_IN, EN, FORCEON, FORCEOFFInput Leakage Current±0.01±1µA
MAX3221E/MAX3223E/MAX3243E
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
ELECTRICAL CHARACTERISTICS (continued)

(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.)
PARAMETERMINTYPMAXUNITS

±25
Output Short-Circuit Current±60mA
Output Resistance30010MΩ
Output Leakage CurrentµA
Input Threshold Low0.61.2V±5.4Output Voltage SwingV
CONDITIONS

VCC= V+ = V- = 0, TOUT= ±2V
VOUT= ±12V, VCC= 0 or 3V to
5.5V, transmitters disabled
All transmitter outputs loaded with
3kΩto ground
Receiver Positive or Negative
Threshold to INVALIDHigh1µsVCC= 5V, Figure 5b
Input Hysteresis0.5V
Input Threshold HighV
Input Resistance357kΩ
1.52.4= +25°C= +25°C
±5.0Transmitter Output VoltageV
T1IN = T2IN = GND, T3IN = VCC,
T3OUT loaded with 3kΩto GND,
T1OUT and T2OUT loaded with
2.5mA each
tINVH
SYMBOL

VCC= 3.3V
VCC= 5.0V
VCC= 3.3V
VCC= 5.0V
±15IEC 1000-4-2 Air-Gap Discharge
Receiver Positive or Negative
Threshold to INVALIDLow30µsVCC= 5V, Figure 5btINVL
Input Voltage Range-2525V
Receiver or Transmitter Edge to
Transmitters Enabled100µsVCC= 5V, Figure 5btWU
Input Voltage Range-2525VIEC 1000-4-2 Contact DischargeR_IN, T_OUT
±15Human Body Model
RECEIVER INPUTS
TRANSMITTER OUTPUTS
MOUSE DRIVEABILITY (MAX3243E)
ESDPROTECTION

MAX3221E/MAX3223E/MAX3243E
Typical Operating Characteristics
(VCC= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩand CL, TA = +25°C, unless otherwise noted.)10002000300040005000
MAX3221E/MAX3223E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE

MAX3221E-01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
VOUT+
T1 TRANSMITTING AT 250kbps
T2 (MAX3223E) TRANSMITTING AT 15.6kbps
VOUT-10002000300040005000
MAX3221E/MAX3223E
SLEW RATE vs. LOAD CAPACITANCE

MAX3221-TOC2
LOAD CAPACITANCE (pF)
SLEW RATE (V/-SLEW
+SLEW
FOR DATA RATES UP TO 250kbps
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
TIMING CHARACTERISTICS—MAX3221E/MAX3223E/MAX3243E

(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.)
Note 2:
C1–C4 = 0.1µF, tested at 3.3V ±10%. C1 = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%.
Note 3:
Transmitter skew is measured at the transmitter zero cross points.
tPLH= 3kΩ, CL= 1000pF,
one transmitter switching
tPHL
SYMBOL
tPHL- tPLHtPHL- tPLH
Receiver Output Disable Timens
CONDITIONS
0.15Receiver Propagation Delay= 150pF to
1000pF
kbps
UNITSMINTYPMAXPARAMETER

(Note 3)50Receiver Skew100Transmitter Skew
VCC= 3.3V, = 3kΩto 7kΩ, = +25°C,
measured from +3V
to -3V or
-3V to +3V, one
transmitter switching
V/µsTransition-Region Slew Rate630= 150pF
Maximum Data RateNormal operationReceiver Output Enable Time
200Normal operation
MAX3221E/MAX3223E/MAX3243E
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
Typical Operating Characteristics (continued)

(VCC= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩand CL, TA= +25°C, unless otherwise noted.)
MAX3243E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE

MAX3224E-04
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
VOUT+
VOUT-10002000300040005000
MAX3243E
SLEW RATE vs. LOAD CAPACITANCE

MAX3243E-05
LOAD CAPACITANCE (pF)
SLEW RATE (V/20001000300040005000
MAX3243E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE

MAX3243E-06
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
250kbps
120kbps
20kbps
T1 TRANSMITTING AT 250kbps
T2 (MAX3223E) TRANSMITTING AT 15.6kbps20001000300040005000
MAX3221E/MAX3223E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE

MAX3224E-03
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
250kbps
120kbps
20kbps
T1 TRANSMITTING AT 250kbps
T2 (MAX3223E) TRANSMITTING AT 15.6kbps
MAX3221E/MAX3223E/MAX3243E
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
Pin Description
PIN
MAX3221E MAX3223E MAX3243E
TQFN-
EP
SSOP/
TSSOP
TQFN-
EP
DIP/
SSOP/
TSSOP
SO/
SSOP/
TSSOP
TQFN-
EP
NAME FUNCTION

14 1 19 1 — 22 EN
Receiver Enable Control. Drive low for normal
operation. Drive high to force the receiver outputs
(R_OUT) into a high-impedance state.
16 2 1 2 28 28 C1+ Positive terminal of the voltage doubler Charge-Pump
Capacitor
15 3 20 3 27 27 V+ +5.5V generated by the charge pump
1 4 2 4 24 23 C1- Negative terminal of the voltage doubler Charge-Pump
Capacitor 5 35129C2+ Positive terminal of inverting Charge-Pump Capacitor 6 46230C2-Negative terminal of inverting Charge-Pump Capacitor
4 7 57331V- -5.5V generated by the charge pump 8 7, 149, 164-81-5R_IN RS-232 Receiver Inputs 9 8, 13 10, 15 15-19
13, 14,
15, 17,
R_OUT TTL/CMOS Receiver Outputs
7 10 9 11 21 — INVALID
Output of the Valid Signal Detector. INVALID is enabled
high if a valid RS-232 level is present on any receiver
input. 11 10, 11 12, 13 12, 13,
10, 11, T_IN TTL/CMOS Transmitter Inputs 12 12 14 23 — FORCEON
Drive high to override automatic circuitry keeping
transmitters and charge pump on (FORCEOFF must be
high) (Table 1).
10 13 6, 15 8, 17 9, 10, 6, 7, 8 T_OUT RS-232 Transmitter Outputs
— — — — 20 19 R2OUTB TTL/CMOS Noninverting Complementary Receiver
Output. Always active.
11 14 16 18 25 24 GND Ground
12 15 17 19 26 26 VCC +3.0V to +5.5V Supply Voltage
13 16 18 20 22 — FORCEOF
Force-Off Input, active low. Drive low to shut down
transmitters, receivers (MAX3243E, except R2OUTB),
and on-board charge pump. This overrides all
automatic circuitry and FORCEON (Table 1).
— — — — — 21 SHDNShutdown Control, Active Low
MAX3221E/MAX3223E/MAX3243E
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
_______________Detailed Description
Dual Charge-Pump Voltage Converter

The MAX3221E/MAX3223E/MAX3243E’s internal power
supply consists of a regulated dual charge pump that
provides output voltages of +5.5V (doubling charge
pump) and -5.5V (inverting charge pump), over the
+3.0V to +5.5V VCCrange. The charge pumps operate
in discontinuous mode: if the output voltages are less
than 5.5V, the charge pumps are enabled; if the output
voltages exceed 5.5V, the charge pumps are disabled.
Each charge pump requires a flying capacitor (C1, C2)
and a reservoir capacitor (C3, C4) to generate the V+
and V- supplies.
RS-232 Transmitters

The transmitters are inverting level translators that con-
vert CMOS-logic levels to 5.0V EIA/TIA-232 levels. They
guarantee a 250kbps data rate with worst-case loads
of 3kΩin parallel with 1000pF, providing compatibility
with PC-to-PC communication software such as
LapLink™. Transmitters can be paralleled to drive mul-
tiple receivers. The MAX3243E has been specifically
designed to drive serial mice. Figure 1 shows a com-
plete system connection. When FORCEOFFis driven to
ground, or the AutoShutdown circuitry senses invalid
voltage levels on all receiver inputs, the transmitters are
disabled and the outputs are forced into a high-imped-
ance state. When powered off or shut down, the output
can be driven up to ±12V. The transmitter inputs do not
have pull-up resistors.
Pin Description(continued)
PIN
MAX3221E MAX3223E MAX3243E
TQFN-
EP
SSOP/
TSSOP
TQFN-
EP
DIP/
SSOP/
TSSOP
SO/
SSOP/
TSSOP
TQFN-
EP NAME
FUNCTION

— — — — — 19, 20 R_OUTB Noninverting Complementary Receiver Outputs.
Always active.
— — — — — 9, 16,
25, 32 N.C. No Connection. Not internally connected.
— — — — — — EP Exposed Paddle (TQFN package only). Solder the exposed
paddle to the ground plane or leave unconnected.
MAX3243E
I/O
CHIP
WITH
UART
CPU
RS-232
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
FORCEOFF
FORCEON
INVALID
Figure 1. Interface Under Control of PMU
LapLink is a trademark of Traveling Software.
MAX3221E/MAX3223E/MAX3243E
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
RS-232 Receivers

The MAX3221E/MAX3223E/MAX3243E’s receivers con-
vert RS-232 signals to CMOS-logic output levels. All
receivers have inverting three-state outputs and can be
active or inactive. In shutdown (FORCEOFF= low) or in
AutoShutdown, the MAX3221E/MAX3223E’s receivers
are active (Table 1). Drive ENhigh to place the receiv-
er(s) in a high-impedance state. The MAX3243E’s
receivers are high-impedance when the part is in shut-
down (FORCEOFF= low).
The MAX3243E features an extra, always-active com-
plementary output (R2OUTB). R2OUTB monitors
receiver activity while the other receivers are high-
impedance. This allows Ring Indicator to be monitored
without forward biasing other devices connected to the
receiver outputs. This is ideal for systems where VCC
drops to 0 in shutdown to accommodate peripherals
such as UARTs (Figure 2).
The MAX3221E/MAX3223E/MAX3243E feature an
INVALIDoutput that is enabled low when no valid RS-232
signal levels have been detected on all receiver inputs.
INVALIDis functional in any mode (Figures 3 and 5).
AutoShutdown

The MAX3221E/MAX3223E/MAX3243E achieve a 1µA
supply current with Maxim’s new AutoShutdown fea-
ture, which operates when FORCEON is low and
FORCEOFFis high. When these devices sense no valid
signal levels on all receiver inputs for 30µs, the on-
board charge pump and drivers are shut off, reducing
supply current to 1µA. This occurs if the RS-232 cable
is disconnected or the connected peripheral transmit-
ters are turned off. The device 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.
Table 2 and Figure 3c summarize the MAX3221E/
MAX3223E/MAX3243E operating modes. FORCEON
and FORCEOFFoverride AutoShutdown. When neither
control is asserted, the IC selects between these states
automatically, based on receiver input levels. Figures
3a, 3b, and 5a depict valid and invalid RS-232 receiver
levels. Figure 5 shows the input levels and timing dia-
gram for AutoShutdown operation.
MAX3243E
T1OUT
R2OUTB
5kΩUART
VCC
T1IN
THREE-STATED
LOGIC
TRANSITION
DETECTOR
R2IN
PROTECTION
DIODE
R2OUT
FORCEOFF = GND
VCCµP
PREVIOUS
RS-232
UART
SHDN = GND
VCC
VCC
GND
5kΩ
a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE

RECEIVER OUTPUT IN SHUTDOWN.
b) NEW MAX3243E: IN SHUTDOWN, R2OUTB IS USED TO MONITOR EXTERNAL

DEVICES AND R2OUT IS THREE STATED, ELIMINATING A CURRENT PATH
THROUGH THE UART'S PROTECTION DIODE.
GND
PROTECTION
DIODE
Figure 2. The MAX3243E detects RS-232 activity when the
UART and interface are shut down.
MAX3221E/MAX3223E/MAX3243E
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
Table 1. Output Control Truth Table

+0.3V
-0.3V
INVALID
TO MAX32_ _E
POWER SUPPLY
AND TRANSMITTERSR_IN
* TRANSMITTERS ARE DISABLED, REDUCING SUPPLY CURRENT TO 1µA IF
ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30µs.
30µs
COUNTER
Figure 3a. MAX32_ _E Entering 1µA Supply Mode via
AutoShutdown
+2.7V
-2.7V
INVALID
TO MAX32_ _E
POWER SUPPLYR_IN
*TRANSMITTERS ARE ENABLED IF:
ANY RECEIVER INPUT IS GREATER THAN +2.7V OR LESS THAN -2.7V.
ANY RECEIVER INPUT HAS BEEN BETWEEN +0.3V AND -0.3V FOR LESS THAN 30µs.
30µs
COUNTER
Figure 3b. MAX32_ _E with Transmitters Enabled Using
AutoShutdown
X = Don’t Care
A mouse or other system with AutoShutdown may need
time to wake up. Figure 4 shows a circuit that forces
the transmitters on for 100ms, allowing enough time for
the other system to realize that the MAX3221E/
MAX3223E/ MAX3243E are awake. If the other system
transmits valid RS-232 signals within that time, the RS-
232 ports on both systems remain enabled.
When shut down, the device’s charge pumps are off,
V+ is pulled to VCC, V- is pulled to ground, and the
transmitter outputs are high impedance. The time
required to exit shutdown is typically 100µs (Figure 5b).
Software-Controlled Shutdown

If direct software control is desired, INVALIDcan be
used to indicate DTR or Ring Indicator signal. Connect
FORCEOFFand FORCEON together to disable Auto-
Shutdown so the line acts like a SHDNinput.
±15kV ESD Protection

As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against electrostatic
discharges encountered during handling and assembly.
The driver outputs and receiver inputs of the
MAX3221E/MAX3223E/MAX3243E have extra protection
against static electricity. Maxim’s engineers have devel-
oped state-of-the-art structures to protect these pins
against ESD of ±15kV without damage. The ESD struc-
tures withstand high ESD in all states: normal operation,
shutdown, and powered down. After an ESD event,
Maxim’s E versions keep working without latchup,
whereas competing RS-232 products can latch and
must be powered down to remove latchup. See Table 4.
FORCEON

Active
Active
Active
R2OUTB
(MAX3243E)

Active
Active
Active
Active
Active
Active
High-Z
R_OUT
(MAX3221E/
MAX3223E)

Active
Active
High-Z
High-Z
FORCEOFF
Active
High-Z
Active
T_OUT

High-Z
Active
Active
High-Z
Active
Active
Active
R_OUT
(MAX3243E)

High-Z
Active
Active
High-ZYes
Normal Operation
(AutoShutdown)YesXNormal Operation
(Forced On)X
Shutdown
(Forced Off)X
(MAX3221E/
MAX3223E)
VALID
RECEIVER
LEVEL
X
OPERATION
STATUS
ActiveHigh-Z1High-ZActive
Shutdown
(AutoShutdown)No1
MAX3221E/MAX3223E/MAX3243E
ESD protection can be tested in various ways; the trans-
mitter outputs and receiver inputs of this product family
are characterized for protection to the following limits:
1) ±15kV using the Human Body Model
2) ±8kV using the Contact Discharge Method specified
in IEC1000-4-2
3) ±15kV using IEC1000-4-2’s Air-Gap MethodESSDD TTeesstt CCoonnddiittiioonnss
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.Huummaann BBooddyy MMooddeell
Figure 6a shows the Human Body Model, and Figure
6b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the test device through a
1.5kΩresistor.
IEC1000-4-2

The IEC1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The MAX3221E/ MAX3223E/
MAX3243E help you design equipment that meets
VCC
VCC
tINVL
tWU
INVALID
REGION
RECEIVER
INPUT
VOLTAGE
(V)
INVALID
OUTPUT
(V)
tINVH
TRANSMITTERS ENABLED, INVALID HIGH

RECEIVER INPUT LEVELS
AUTOSHUTDOWN, TRANSMITTERS DISABLED,
1µA SUPPLY CURRENT, INVALID LOW
TRANSMITTERS ENABLED, INVALID HIGH

-2.7V
-0.3V
+2.7V
+0.3V
INDETERMINATE
INDETERMINATE
Figure 5. AutoShutdown Trip Levels
FORCEON
MASTER SHDN LINE
0.1µF1MΩ
FORCEOFF
MAX3221E
MAX3223E
MAX3243E
POWER-
MANAGEMENT
UNIT
Figure 4. AutoShutdown with Initial Turn-On to Wake Up a
Mouse or Another System
FORCEOFFPOWER DOWN
INVALID
FORCEON
INVALID IS AN INTERNALLY GENERATED SIGNAL
THAT IS USED BY THE AUTOSHUTDOWN LOGIC
AND APPEARS AS AN OUTPUT OF THE DEVICE.
POWER DOWN IS ONLY AN INTERNAL SIGNAL.
IT CONTROLS THE OPERATIONAL STATUS OF
THE TRANSMITTERS AND THE POWER SUPPLIES.
Figure 3c. MAX32_ _E AutoShutdown Logic
Table 2. INVALIDTruth Table

LowNo
HighYes
INVALIDOUTPUTRS-232 SIGNAL PRESENT
AT ANY RECEIVER INPUT
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown

MAX3221E/MAX3223E/MAX3243E
ic,good price


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