Incremental Encoder Interface for RS-422, HTL, and TTL with Digital Inputs

Industry's Most Robust Quad RS-422/TTL/HTL Receivers + 2 DI

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The MAX14890E incremental encoder receiver contains four differential receivers and two single-ended receivers.

The differential receivers can be operated in RS-422 or differential high-threshold logic (HTL) modes and are optionally configurable for single-ended TTL/HTL operation. The MAX14890E features a wide common mode input range of -20V to +20V in RS-422 mode.

The auxiliary IEC 61131-2 Type-1/Type-3 digital inputs are designed for operation with switches or proximity sensors and can be individually configured for TTL operation.

All receiver input signals are fault protected to voltage shorts in the ±40V range. Per channel fault detection provides warning of irregular conditions such as small differential signals, shorts, opens, overvoltages, and under voltages.

The MAX14890E features a pin-selectable SPI or parallel-logic interface. SPI control provides detailed diagnostics and individual configurations for receivers.

The MAX14890E is available in a 32-pin TQFN-EP (5mm x 5mm) and operates over the -40°C to +125°C temperature range.

MAX14890E: Typical Operating Circuit MAX14890E: Typical Operating Circuit Enlarge+

Key Features

  • High Flexibility Supports All Encoder Types
    • Selectable RS-422/HTL/TTL/DI Receivers
    • RS-422/TTL Switching Rates Up to 35Mbps
    • HTL Switching Rates Up to 400kHz
    • SPI or Pin-Controlled Operation
    • SPI Interface Allows Per-Receiver Configuration
    • 1.62V to 5.5V Logic Interface
  • Integrated Fault Detection Reduces Down-Time
    • Open-Wire and Short-Circuit Detection
    • Overvoltage and Undervoltage Fault Detection
  • Integrated Protection Ensures Robust Communication
    • ±40V Fault Protection Range
    • ±20V RS-422 Common Mode Range
    • DI Glitch Filters
    • ±25kV HBM ESD
    • ±7kV Air-Gap per IEC 61000-4-2 ESD
    • ±10kV Contact per IEC 61000-4-2 ESD
    • -40°C to +125°C Operating Temperature Range


  • Encoder Interfaces
  • Motor Controllers
  • Pulse Counters
  • Servo Control Commutation
Part NumberTx/RxDuplexVSUPPLY
Fault Protect.
Data Rate
ESD Protect.
Tx ENRx ENOper. Temp.
typminSee Notes
MAX14890E 4RxHalf54093500025NoNo-40 to +125
$3.33 @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.

MAX14890EEVKIT: Evaluation Kit for MAX14890E

Quality and Environmental Data

Product Reliability Reports: MAX14890E.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Transceivers for Motion Control ›

Tools & Models

  • MAX14890E IBIS Model
  • 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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