+2.7V to +3.6V Powered, 1µA Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver

Please check latest availability status for a specific part variant.


The MAX3212 uses Maxim's new proprietary AutoShutdown mode to reduce supply current to 1µA. The MAX3212, with 3 RS-232 drivers and 5 RS-232 receivers, is intended for 2.7V to 3.6V-powered EIA/TIA-232E and V.28/V.24 serial interface. True RS-232 levels are maintained across the operating range. A guaranteed data rate of 235kbps provides compatibility with popular software for communicating with personal computers.

Supply current is reduced to 1µA with Maxim's new AutoShutdown feature. When the MAX3212 does not sense a valid signal level on the 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 software.

A second power-management feature is incorporated to permit automatic shutdown when the RS-232 connection is valid but inactive. In this case, a transition detector facilitates shutdown when the receivers are presented with stationary RS-232 levels for long periods.

Three-state drivers are provided on receiver outputs so that multiple receivers, generally of different interface standards, can be wire-ORed at the UART. The MAX3212 is available in 28-pin SO and SSOP packages.
MAX3212: Typical Operating Circuit MAX3212: Typical Operating Circuit Enlarge+

Key Features

  • 1µA Supply Current Using AutoShutdown
  • Operates from Single +2.7V to +3.6V Supply
  • 28-Pin SSOP or Wide SO Packages
  • Meets All EIA/TIA-232E & EIA/TIA-562 Specifications
  • Mouse Driveability-Guaranteed
  • Low-Cost, Surface-Mount External Components
  • 235kbps Guaranteed Data Rate-LapLink® Compatible
  • +5V Logic Compatible
  • Complementary Receiver Output Always Active
  • Flow-Through Pinout


  • Battery-Powered Applications
  • Instruments
  • Notebook and Palmtop Computers
  • Peripherals

See parametric specs for RS-232 Line Driver/Receivers (136)

Part NumberVSUPPLY
TxRxData Rate
Internal Charge PumpExternal CapsCap. Value
Rx Active in ShutdnPackage/PinsBudgetary
mintypnomSee Notes
SOIC (W)/28
$5.14 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Request Reliability Report for: MAX3212 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >


Related Resources

+3V to +5.5V, Polarity Invert RS-485 Half-Duplex Transceiver with ±65V Fault Protection, ±40V CMR, and ±40kV ESD

  • Integrated Protection for Robust Communication
  • High-Performance Transceiver Enables Flexible Designs

+3V to +5.5V, Polarity Invert RS-485 Half-Duplex Transceiver with ±65V Fault Protection, ±40V CMR, and ±40kV ESD

  • Integrated Protection for Robust Communication
  • High-Performance Transceiver Enables Flexible Designs

Home Bus System (HBS) Compatible Transceiver

  • High Integration Reduces BOM and Footprint
  • Configurability Enables Flexible Design
  • Integrated Protection for Robust Communication

Low Power IO-Link Device Transceiver with Dual Drivers

  • Low Power Dissipation Reduces the Thermal Footprint for Small Sensors
  • Configurability and Integration Reduce SKUs
  • Selectable Driver Integrated Protection Enables Robust Communication