±80V Fault-Protected, Full-Duplex RS-485 Transceiver

Industry's First ±80V Fault-Protected, Full-Duplex RS-485 Transceiver

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The MAX13448E full-duplex RS-485 transceiver features inputs and outputs fault protected up to ±80V (with respect to ground). The device operates from a +3.0V to +5.5V supply and features true fail-safe circuitry, guaranteeing a logic-high receiver output when the receiver inputs are open or shorted. This enables all receiver outputs on a terminated bus to output logic-high when all transmitters are disabled.

The MAX13448E features a slew-rate limited driver that minimizes EMI and reduces reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 500kbps with a +5V supply, and 250kbps with a +3.3V supply.

The MAX13448E includes a hot-swap capability to eliminate false transitions on the bus during power-up or hot insertion. The driver and receiver feature active-high and active-low enables, respectively, that can be connected together externally to serve as a direction control.

The MAX13448E features an 1/8-unit load receiver input impedance, allowing up to 256 transceivers on the bus. All driver outputs are protected to ±8kV ESD using the Human Body Model. The MAX13448E is available in a 14-pin SO package and operates over the extended -40°C to +85°C temperature range.
MAX13448E: Functional Diagram MAX13448E: Functional Diagram Enlarge+

Key Features

  • ±80V Fault Protection on the RS-485 I/O Ports
  • True Fail-Safe Receiver
  • Hot-Swap Input Structure on DE
  • ESD Protection on the RS-485 I/O Ports ±8kV Human Body Model
  • Slew-Rate Limiting Facilitates Error-Free Data Transmission
  • 1/8-Unit Load Allows Up to 256 Transceivers on the Bus
  • -7V to +12V Common-Mode Input Voltage Range
  • +3.0V to +5.5V Operating Supply Voltage
  • Available in 14-Pin SO Package


  • HVAC Control Systems
  • Industrial Control Systems
  • Motor Driver Control Systems
  • Utility Meters
Part NumberTx/RxDuplexVSUPPLY
Fault Protect.
Data Rate
ESD Protect.
Tx ENRx ENICC (Shutdn.)
Rx/Tx on BusRx Failsafe w/ InputsSlew Rate LimitingOper. Temp.
typmintypSee Notes
MAX13448E 1Tx + 1RxFull3.0 to 5.5804.550015YesYes10256Open or ShortedYes-40 to +85
SOIC (N)/14
$2.34 @1k
See All RS-485/RS-422 Line Driver/Receivers (204)
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.

CAD Symbols and Footprints

  • MAX13448EESD+
  • MAX13448EESD+T
  • MAX13448ESD+
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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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