MAX3221/MAX3223/MAX3243
+3V to +5.5V RS-232
Transceivers with AutoShutdown
General Description
Benefits and Features
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.
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.
• Integrated Charge Pump Circuitry Simplifies Power
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. Please see order
information table for package offerings.
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
MAX3221CAE
MAX3221CUE†
TEMP RANGE
PIN-PACKAGE
0°C to +70°C
16 SSOP
0°C to +70°C
16 TSSOP
MAX3221EAE
-40°C to +85°C
16 SSOP
MAX3221EUE†
-40°C to +85°C
16 TSSOP
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
20 TSSOP
0°C to +70°C
28 Wide SO
0°C to +70°C
28 SSOP
0°C to +70°C
28 TSSOP
-40°C to +85°C
28 Wide SO
-40°C to +85°C
28 SSOP
MAX3243EUI
MAX3221
-40°C to +85°C
MAX3243EAI
VCC RANGE (V) AutoShutdown
20 SSOP
MAX3243CUI
Rx
20 Plastic DIP
-40°C to +85°C
MAX3243CAI
Tx
20 TSSOP
-40°C to +85°C
MAX3243CWI
PART
0°C to +70°C
MAX3223EUP
Selector Guide
20 SSOP
MAX3223CUP
MAX3223EAP
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Portable Diagnostics Equipment
20 Plastic DIP
0°C to +70°C
MAX3243EWI
•
•
•
•
0°C to +70°C
MAX3223CAP
MAX3223EPP
Applications
MAX3223CPP
-40°C to +85°C
28 TSSOP
†Future product—contact factory for availability.
