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Half-Duplex RS-485 Transceiver with Polarity Correction

Auto Polarity Correction Protects Your System from Incorrect Installation

Product Details

Key Features

Parametric specs for RS-485/RS-422 Line Driver/Receivers
# Tx/Rx 1Tx + 1Rx
Duplex Half
VSUPPLY (V) 5
Data Rate (kbps) (min) 370
ICC (mA) (typ) 1.2
ESD Protect. (±kV) 25
Tx EN Yes
Rx EN Yes
ICC (Shutdn.) (µA) (typ) 2.8
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
1.26
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Simplified Block Diagram

Technical Docs

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Parameters

Parametric specs for RS-485/RS-422 Line Driver/Receivers
# Tx/Rx 1Tx + 1Rx
Duplex Half
VSUPPLY (V) 5
Data Rate (kbps) (min) 370
ICC (mA) (typ) 1.2
ESD Protect. (±kV) 25
Tx EN Yes
Rx EN Yes
ICC (Shutdn.) (µA) (typ) 2.8
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
1.26

Key Features

  • Automatic Polarity Correction
  • Integrated Protection Increases Robustness
    • High ESD Protection
      • ±25kV HBM ESD
      • ±15kV IEC 61000-4-2 Air Gap Discharge ESD
      • ±9kV IEC 61000-4-2 Contact Discharge ESD
    • True Fail-Safe Receiver
    • Hot-Swap Functionality
  • +5V Operation
  • Low 10µA (max) Shutdown Current
  • Extended -40°C to +85°C Operating Temperature

Applications/Uses

  • Control Systems
  • HVAC Networks
  • Power Meter Networks

Description

The MAX14781E +5V, half-duplex ±25kV ESD-protected RS-485 transceiver features integrated automatic polarity correction to ensure that miswired A and B lines are autonomously corrected, simplifying equipment and network installation.

The MAX14781E includes slew-rate limited drivers that minimize EMI, allowing for error-free data transmission up to 370kbps.

This device includes fail-safe circuitry, guaranteeing a logic-high receiver output when the receiver inputs are shorted or open. Hot-swap functionality on the receiver and driver enable inputs also eliminates false transitions on the bus during power-up or live insertion.

The MAX14781E features a 1/8-unit load receiver input impedance, allowing up to 256 transceivers on the bus. All driver outputs are protected up to ±25kV ESD using the Human Body Model. The MAX14781E is available in an 8-pin SO package and operates over the extended -40°C to +85°C temperature range.

Simplified Block Diagram

MAX14781E: Functional Diagram MAX14781E: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.