Document
Click here for production status of specific part numbers.
MAX3221/MAX3223/ MAX3243
+3V to +5.5V RS-232 Transceivers with AutoShutdown
General Description
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 onboard 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.
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.
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.
The MAX3221 is a 1-driver/1-receiver 16-pin SSOP version of the 20-pin 2-driver/2-receiver MAX3223.
The MAX3243 is a 3-driver/5-receiver with a complementary always-active receiver for external monitoring in a variety of 28 pin packages. See Order Information table for package offerings.
Applications
●● Battery-Powered Equipment ●● Hand-Held Equipment ●● Peripherals ●● Portable Diagnostics Equipment
Selector Guide
PART Tx Rx VCC RANGE (V) AutoShutdown
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.
Benefits and Features
●● Integrated Charge Pump Circuitry Simplifies Power Requirements • Eliminates the Need for a ±12 Supply • Operation From a Single +3.3V or +5V Supply
●● 1µA Supply Current in Shutdown Mode Saves Power • AutoShutdown Feature is Enabled After No Activity on Receiver Inputs for 30µs • Software Control Option for Shutdown
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3221CAE
0°C to +70°C
16 SSOP
MAX3221CUE†
0°C to +70°C
16 TSSOP
MAX3221EAE
-40°C to +85°C 16 SSOP
MAX3221EUE†
-40°C to +85°C 16 TSSOP
MAX3223CPP
0°C to +70°C
20 Plastic DIP
MAX3223CAP
0°C to +70°C
20 SSOP
MAX3223CUP
0°C to +70°C
20 TSSOP
MAX3223EPP
-40°C to +85°C 20 Plastic DIP
MAX3223EAP
-40°C to +85°C 20 SSOP
MAX3223EUP
-40°C to +85°C 20 TSSOP
MAX3243CWI
0°C to +70°C
28 Wide SO
MAX3243CAI
0°C to +70°C
28 SSOP
MAX3243CUI
0°C to +70°C
28 TSSOP
MAX3243EWI
-40°C to +85°C 28 Wide SO
MAX3243EAI
-40°C to +85°C 28 SSOP
MAX3243EUI
-40°C to +85°C 28 TSSOP
†Future product—contact factory for availability.
19-0306; Rev 10; 5/19
MAX3221/MAX3223/ MAX3243
+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).................................................................+13V Input Voltages T_IN, FORCEOFF, FORCEON, EN (MAX3223)... -0.3V to +6V
R_IN.................................................................................±25V Output Voltages T_OUT...........................................................................±13.2V R_OUT, INVALID................................... -0.3V to (VCC + 0.3V) Short-Circuit Duration
T_OUT.................................................................... Continuous Continuous Power Dissipation (TA = +70°C) 16-Pin SSOP (derate 7.14mW/°C above +70°C).........571mW
16-Pin TSSOP (derate 6.70mW/°C above +70°C).......533mW 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 DIP
(derate 7.00mW/°C above +70°C)...............................559mW 28-Pin Wide SO (derate 12.50mW/°C above +70°C).........1W 28-Pin SSOP (derate 9.52mW/°C above +70°C).........762mW 28-Pin TSSOP (derate 8.70mW/°C above +70°C).......696mW Operating Temperature Ranges MAX32_ _C_ _....................................................0°C to +70°C MAX32_ _E_ _................................................ -40°C to +85°C Storage Temperature Range............................. -65°C to +150°C Lead 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 functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the spe.