±70V Fault-Protected, 3.0V to 5.5V, 2Tx/2Rx RS-232 Transceiver

Industry's First RS-232 Transceiver with Integrated ±70V Fault Protection Eliminates Need for External Protection

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The MAX13223E is a +3.0V to +5.5V-powered EIA/TIA-232 and V.28 communications interface with fault protection on the RS-232 line interface. This allows shorts of the transmitter outputs and receiver inputs to voltages in the ±70V range without adversely affecting the MAX13223E.

The MAX13223E achieves 1µA supply current using Maxim's AutoShutdown™ feature. The MAX13223E automatically enters a low-power shutdown mode when the RS-232 cable is disconnected or the receivers are inactive. The device turns on again when a valid transition at any receiver input is sensed. 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 MAX13223E has two receivers and two drivers and is guaranteed to run at data rates of 250kbps for one transmitter switching while maintaining RS-232 output levels.

The MAX13223E operates from input voltages ranging from +3.0V to +5.5V and is available in a 20-pin, 6.5mm x 4.4mm, TSSOP package. The MAX13223E is specified over the -40°C to +85°C temperature range.
MAX13223E: Typical Operating Circuit MAX13223E: Typical Operating Circuit Enlarge+

Key Features

  • Robust Protection to Withstand Load Dumps, Miswiring, and Connector Failures
    • ±70V Fault Protection
    • Overvoltage Current Limiting
    • Current Protection at Transmitter Outputs
    • Thermal Shutdown Protection
  • Flexible Power Requirements Simplify Design
    • +3.0V to +5.5V Single Supply Voltage
    • True RS-232 Performance (Up to 250kbps) Even from +3.0V Supply Voltage
  • AutoShutdown Simplifies Power Savings
    • Automatically Enters Shutdown Mode if RS-232 Cable is Disconnected or Receivers are Inactive Automatically Activates from Shutdown When Any Valid Transition is Sensed
    • 1µA Typical Shutdown Current


  • Base Stations
  • Industrial Equipment
  • POS Terminal Equipment
  • Telecomm Equipment
  • Telematics Equipment
  • Utility Meters

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

Part NumberVSUPPLY
TxRxData Rate
Internal Charge PumpExternal CapsCap. Value
Rx Active in ShutdnPackage/PinsBudgetary
(min)(typ)(nom)(See Notes)
$2.60 @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.
Product Reliability Reports: MAX13223E.pdf 
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.

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