RS-485 Transceivers with Integrated 100Ω/120Ω Termination Resistors

Software/Pin-Selectable Termination Eliminates the Need for External Resistors and DIP Switches

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The MAX13450E/MAX13451E are half-duplex and full-duplex RS-485/RS-422 transceivers. These devices feature internal 100Ω and 120Ω termination resistors. The resistor values are pin selectable. A logic supply input allows interfacing to logic levels down to +1.8V.

The MAX13450E/MAX13451E feature strong drivers specified to drive low-impedance lines found when a fully loaded bus, based on today's 100Ω characteristic impedance cable, is doubly terminated. Both devices allow slew-rate limiting of the driver output to reduce EMI and reflections for data rates up to 500kbps.

The MAX13451E has a FAULT alarm indication output to signal to the system that an error condition exists in the driver. The MAX13451E also features a logic inversion function. The logic inversion allows phase reversal of the A-B signals in case these are inadvertently connected wrongly.

The MAX13450E/MAX13451E have 1/8-unit load receiver input impedance, allowing up to 256 transceivers on the bus. All driver outputs are protected to ±30kV ESD using the Human Body Model (HBM).

The MAX13450E/MAX13451E are available in a 14-pin TSSOP package and operate over the automotive -40°C to +125°C temperature range.
MAX13450E, MAX13451E: Functional Diagram (MAX13451E) MAX13450E, MAX13451E: Functional Diagram (MAX13451E) Enlarge+

Key Features

  • Easy Configuration of RS-422 and RS-485 Networks Up to 20Mbps (max) Data Rate
    • Software/Pin-Selectable 100Ω/120Ω Termination
    • Integrated, Switchable Resistors Eliminate the Need for External Resistors or DIP Switches
    • Driver Drives 100Ω Double Termination and Supports Cat-5/Cat-6 and 24-AWG Cables
    • Pin-Selectable Slew-Rate Limiting Reduces EMI for Data Rates Up to 500kbps
    • 1/8 Unit Load Allows Up to 256 Transceivers On the Bus
  • Designed to Perform in Harsh Environments
    • Extended ESD Protection
      • ±30kV Human Body Model
      • ±15kV Air Gap Discharge per IEC 61000-4-2
      • ±7kV Contact Discharge per IEC 61000-4-2
    • Inverting of A, B Line Polarity (MAX13451E) Allows Phase Reversal if Misconnected
    • Thermal and Overcurrent Protection
    • Driver Fault Indication (MAX13451E)
    • Fail-Safe Receivers
    • -40°C to +125°C Temperature Range
    • +4.5V to +5.5V Supply Voltage Range
  • Integrated Low-Voltage Logic Interface (Down to 1.8V) Interfaces with Small-Geometry ASICs and FPGA


  • Industrial Control Systems
  • Medical Networks
  • Motor Control
  • Portable Industrial Equipment
  • Security Networks
Part NumberTx/RxDuplexVSUPPLY
Data Rate
ESD Protect.
Tx ENRx ENICC (Shutdn.)
Rx/Tx on BusRx Failsafe w/ InputsSlew Rate LimitingOper. Temp.
typmintypSee Notes
MAX13450E 1Tx + 1RxHalf/Full5-2000030YesYes6256Open or ShortedYes-40 to +125
$2.16 @1k
MAX13451E Half630Open
$2.09 @1k
See All RS-485/RS-422 Line Driver/Receivers (205)
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

  • MAX13451EAUD+
  • MAX13451EAUD+T
  • 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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