MAX13487E
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MAX13487E

Half-Duplex RS-485/RS-422-Compatible Transceiver with AutoDirection Control

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Eliminate an Isolated Control Channel with AutoDirection

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $2.09
Features
  • AutoDirection Saves Space and BOM Cost
    • AutoDirection Enables Driver Automatically on Transmission, Eliminating an Opto or Other Discrete Means of Isolation
    • 8-Pin SO Package
  • Robust Protection Features for Telecom, Industrial, and Isolated Applications
    • Hot-Swap Capability to Eliminate False Transitions on the Bus During Power-Up or Live Insertion
    • Extended ESD Protection for RS-485 I/O Pins (±15kV Human Body Model)
  • Options Optimize Designs for Speed or Errorless Data Transmission
    • Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission (MAX13487E)
    • High-Speed Version (MAX13488E) Allows for Transmission Speeds Up to 16Mbps
  • 1/4-Unit Load, Allowing Up to 128 Transceivers on the Bus
Additional Details
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The MAX13487E/MAX13488E +5V, half-duplex, ±15kV ESD-protected RS-485/RS-422-compatible transceivers feature one driver and one receiver. The MAX13487E/MAX13488E include a hot-swap capability to eliminate false transitions on the bus during power-up or live insertion.

The MAX13487E/MAX13488E feature Maxim's proprietary AutoDirection control. This architecture makes the devices ideal for applications, such as isolated RS-485 ports, where the driver input is used in conjunction with the driver-enable signal to drive the differential bus. The MAX13487E features reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free transmission up to 500kbps. The MAX13488E driver slew rate is not limited, allowing transmit speeds up to 16Mbps.

The MAX13487E/MAX13488E feature a 1/4-unit load receiver input impedance, allowing up to 128 transceivers on the bus. These devices are intended for half-duplex communications. All driver outputs are protected to ±15kV ESD using the Human Body Model. The MAX13487E/MAX13488E are available in an 8-pin SO package. The devices operate over the extended -40°C to +85°C temperature range.

Design Solution: Simplify Your Industrial Interface by Eliminating RS-485 Control Lines ›

Applications

  • Automated HVAC Systems
  • Industrial Controls
  • Industrial Motor Drives
  • Isolated RS-485 Interfaces
  • Utility Meters
Part Models 2
1ku List Price Starting From $2.09

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX13487EESA+
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MAX13487EESA+T
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Part Models

Product Lifecycle

PCN

May 22, 2018

- 1702N

ASSEMBLY

MAX13487EESA+

PRODUCTION

MAX13487EESA+T

PRODUCTION

Filter by Model

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Part Models

Product Lifecycle

PCN

May 22, 2018

- 1702N

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ASSEMBLY

MAX13487EESA+

PRODUCTION

MAX13487EESA+T

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX13487EEVKIT

Evaluation Kit for the MAX13487E and MAX13488E

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MAX13487EEVKIT

Evaluation Kit for the MAX13487E and MAX13488E

Evaluation Kit for the MAX13487E and MAX13488E

Features and Benefits

  • Demonstrates MAX13487E AutoDirection Feature
  • Designed for 2500VRMS Isolation
  • 1/4 RS-485 Unit Loading
  • 500kbps Half-Duplex RS-485/RS-422 Communication
  • +5V DC Input Range
  • Isolated +5V Output
  • Center-Tapped Full-Wave Rectifier Output
  • 420kHz Switching Frequency
  • Output Current Limit and Thermal Shutdown
  • Low-Cost Integrated-FET H-Bridge Design
  • Also Evaluates MAX13488E (After IC Replacement)
  • Fully Assembled and Tested

Product Detail

The MAX13487E evaluation kit (EV kit) is a fully assembled and tested PCB that contains a half-duplex RS-485/RS-422 AutoDirection-controlled transceiver with ESD protection. The EV kit circuit features a differential driver and receiver. The circuit’s receiver is a 1/4-unit load for the RS-485 bus and can communicate up to 500kbps. The MAX13487E AutoDirection and reduced-driver slew-rate features are demonstrated on the EV kit circuit. The EV kit can also be used to evaluate the MAX13488E IC, which can communicate up to 16Mbps.

Power for the transceiver circuit is provided by a MAX256 H-bridge DC/DC converter, which powers the isolated section of the MAX13487E RS-485/RS-422 circuit. Input-ripple current and radiated noise are minimized by using an H-bridge design. The isolated H-bridge DC-DC converter operates at 420kHz. Input power to the EV kit circuit can be supplied by a +5V DC source.

The DC-DC converter circuit uses a surface-mount transformer to provide galvanic isolation and a full-wave rectifier, and provides a regulated +5V to the MAX13487E. A MAX1659 linear low dropout (LDO) regulator provides the regulated output and up to 300mA of current. The output current limit and thermal shutdown provide for a robust isolated RS-485/RS-422 transceiver circuit and power supply. The transceiver and power circuits and PCB are designed for 2500VRMS isolation.

Applications

  • Automated HVAC Systems
  • Industrial Controls
  • Industrial Motor Drives
  • Isolated RS-485 Interfaces
  • Utility Meters

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