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MAX13450E, MAX13451E

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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Active: In Production.


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.

Data Sheet

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Key Features

  • 100Ω/120Ω Pin-Selectable Internal Termination Resistors
  • Driver Drives 100Ω Double Termination
  • 20Mbps (max) Data Rate
  • Pin-Selectable Slew-Rate Limiting
  • Logic Supply Input Allows Interfacing Down to 1.8V
  • Driver Fault-Indication Output (MAX13451E)
  • Inverting of A, B Line Polarity (MAX13451E)
  • High-Impedance Driver Output/Receiver Input When VCC Supply is Removed
  • Hot-Swap Input Structure on DE, Active-Low RE, and Active-Low TERM
  • Extended ESD Protection
    • ±30kV Human Body Model
    • ±15kV Air Gap Discharge per IEC 61000-4-2
    • ±7kV Contact Discharge per IEC 61000-4-2
  • 1/8-Unit Load Allows Up to 256 Transceivers on the Bus
  • Thermal and Overcurrent Protected
  • Fail-Safe Receivers
  • +4.5V to +5.5V Supply Voltage Range


  • Industrial Control Systems
  • Medical Networks
  • Motor Control
  • Portable Industrial Equipment
  • Security Networks

Key Specifications:

RS-422/485 Line Driver/Receivers
Part Number Tx/Rx Duplex VSUPPLY
Data Rate
ESD Protect.
Tx EN Rx EN ICC (Shutdn.)
Rx/Tx on Bus Budgetary
typ min typ See Notes
MAX13450E  1Tx + 1Rx Half/Full 5 - 20000 30 Yes Yes 6 256 $1.96 @1k
MAX13451E  Half 6 30 $2.09 @1k
See All RS-422/485 Line Driver/Receivers (171)

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.


MAX13450E, MAX13451E: Functional Diagram (MAX13451E)
Functional Diagram (MAX13451E)

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New Product Press Release   2010-06-15 ]

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Document Ref.: 19-5254 Rev 1; 2010-12-15
This page last modified: 2010-12-15