+3V to +5.5V RS-232
MAX3221/MAX3223/MAX3243
Transceivers with AutoShutdown
General Description Benefits and Features
The MAX3221/MAX3223/MAX3243 achieve 1A supply Integrated Charge Pump Circuitry Simplifies Power
current with Maxims revolutionary AutoShutdown
Requirements
feature. When the MAX3221/MAX3223/MAX3243 do not
Eliminates the Need for a 12 Supply
sense a valid signal level on their receiver inputs, the
Operation From a Single +3.3V or +5V Supply
on-board power supply and drivers shut down. This
1A Supply Current in Shutdown Mode Saves Power
occurs if the RS-232 cable is disconnected or if the
transmitters of the connected peripheral are turned off.
AutoShutdown Feature is Enabled After No Activity
The system turns on again when a valid level is applied
on Receiver Inputs for 30s
to any RS-232 receiver input.
Software Control Option for Shutdown
The MAX3221/MAX3223/MAX3243 require only 0.1F
capacitors in 3.3V operation, and can operate from
input voltages ranging from +3.0V to +5.5V.
Ordering Information
A proprietary, high-efficiency, dual charge-pump power
supply and a low-dropout transmitter combine to deliv-
PART TEMP RANGE PIN-PACKAGE
er true RS-232 performance from a single +3.0V to
MAX3221CAE 0C to +70C 16 SSOP
+5.5V supply.
MAX3221CUE 0C to +70C 16 TSSOP
The MAX3221 is a 1-driver/1-receiver 16-pin SSOP
MAX3221EAE -40C to +85C 16 SSOP
version of the 20-pin 2-driver/2-receiver MAX3223.
MAX3221EUE -40C to +85C 16 TSSOP
The MAX3243 is a 3-driver/5-receiver with a comple-
MAX3223CPP 0C to +70C 20 Plastic DIP
mentary always-active receiver for external monitoring
MAX3223CAP 0C to +70C 20 SSOP
in a variety of 28 pin packages. Please see order
information table for package offerings. MAX3223CUP 0C to +70C 20 TSSOP
MAX3223EPP -40C to +85C 20 Plastic DIP
Applications
MAX3223EAP -40C to +85C 20 SSOP
Battery-Powered Equipment
MAX3223EUP -40C to +85C 20 TSSOP
Hand-Held Equipment
MAX3243CWI 0C to +70C 28 Wide SO
Peripherals
MAX3243CAI 0C to +70C 28 SSOP
Portable Diagnostics Equipment
MAX3243CUI 0C to +70C 28 TSSOP
MAX3243EWI -40C to +85C 28 Wide SO
MAX3243EAI -40C to +85C 28 SSOP
MAX3243EUI -40C to +85C 28 TSSOP
Selector Guide
Future productcontact factory for availability.
PART Tx Rx V RANGE (V) AutoShutdown
CC
MAX3221 1 1 3.0 to 5.5 Yes
MAX3223 2 2 3.0 to 5.5 Yes
MAX3243 3 5 3.0 to 5.5 Yes
Pin Configurations appear at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
AutoShutdown and UCSP are trademarks of Maxim Integrated
Products, Inc.
19-0306; Rev 9; 1/15+3V to +5.5V RS-232 Transceivers
MAX3221/MAX3223/MAX3243
with AutoShutdown
Absolute Maximum Ratings
V ...........................................................................-0.3V to +6V 16-Pin SSOP (derate 7.14mW/C above +70C) ...........571mW
CC
V+ (Note 1)...............................................................-0.3V to +7V 16-Pin TSSOP (derate 6.70mW/C above +70C) .........533mW
V- (Note 1) ...............................................................+0.3V to -7V 20-Pin Plastic DIP (derate 11.11mW/C above +70C)....889mW
V+ + |V-| (Note 1).................................................................+13V 20-Pin SSOP (derate 8.00mW/C above +70C) ...........640mW
Input Voltages 20-Pin TSSOP DIP (derate 7.00mW/C above +70C).....559mW
28-Pin Wide SO (derate 12.50mW/C above +70C) ............1W
T_IN, FORCEOFF, FORCEON, EN (MAX3223) ......-0.3V to +6V
R_IN ...................................................................................25V 28-Pin SSOP (derate 9.52mW/C above +70C) ...........762mW
Output Voltages 28-Pin TSSOP (derate 8.70mW/C above +70C) .........696mW
T_OUT.............................................................................13.2V Operating Temperature Ranges
R_OUT, INVALID ......................................-0.3V to (V + 0.3V) MAX32_ _C_ _.......................................................0C to +70C
CC
Short-Circuit Duration MAX32_ _E_ _....................................................-40C to +85C
T_OUT ......................................................................Continuous Storage Temperature Range .............................-65C to +150C
Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C
A
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 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.
Electrical Characteristics
(V = +3.0V to +5.5V, C1C4 = 0.1F (Note 2), T = T to T , unless otherwise noted. Typical values are at T = +25C.)
CC A MIN MAX A
PARAMETER CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS
All R_IN open, FORCEON = GND,
Supply Current, AutoShutdown 1.0 10 A
FORCEOFF = V
CC
V = 3.3V
CC
Supply Current, Shutdown or 5.0V, FORCEOFF = GND 1.0 10 A
T = +25C
A
Supply Current, FORCEON = FORCEOFF = V ,
CC
0.3 1.0 mA
AutoShutdown Disabled no load
LOGIC INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold Low T_IN, FORCEON, FORCEOFF, EN (MAX3223) 0.8 V
V = 3.3V 2.0
CC
Input Logic Threshold High T_IN, EN, FORCEON, FORCEOFF V
V = 5.0V 2.4
CC
Input Leakage Current T_IN, EN, FORCEON, FORCEOFF 0.01 1.0 A
Output Leakage Current Receivers disabled 0.05 10 A
Output Voltage Low I = 1.6mA 0.4 V
OUT
Output Voltage High I = -1.0mA V - 0.6 V - 0.1 V
OUT CC CC
AUTOSHUTDOWN (FORCEON = GND, FORCEOFF = V )
CC
Positive threshold 2.7
Receiver Input Thresholds to
Figure 5 V
Transmitters Enabled
Negative threshold -2.7
Receiver Input Thresholds to
1A supply current, Figure 5 -0.3 0.3 V
Transmitters Disabled
INVALID Output Voltage Low I = 1.6mA 0.4 V
OUT
I = -1.0mA V - 0.6 V
INVALID Output Voltage High OUT CC
Receiver Threshold to
Figure 5 250 s
Transmitters Enabled (t )
WU
Receiver Positive or Negative
Figure 5 1 s
Threshold to INVALID High (t )
INVH
Receiver Positive or Negative
Figure 5 30 s
Threshold to INVALID Low (t )
INVL
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