MAX13487EESA+

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1. Description

The MAX13487EESA+/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 halfduplex 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.

2. Features

    1. 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

    2. 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)

    3. Options Optimize Designs for Speed or Errorless Data Transmission

        - Enhanced Slew-Rate Limiting Facilitates ErrorFree Data Transmission (MAX13487E)

        - High-Speed Version (MAX13488E) Allows for Transmission Speeds Up to 16Mbps

    4. 1/4-Unit Load, Allowing Up to 128 Transceivers on the Bus

3. Applications

    1. Isolated RS-485 Interfaces

    2. Utility Meters

    3. Industrial Controls

    4. Industrial Motor Drives

    5. Automated HVAC Systems

Pin Configuration (SOIC-8)

Application Circuit

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   │   DI                           RO       │

   │       MAX13487EESA+          │

   │   DE                          RE# ├─┬─ 120ΩTermination Resistor

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                     │                  │       │

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                                                     │

                                            RS-485 bus

Design points

   1. Terminal matching:

       - Both ends of the bus need to be connected to 120Ω resistors

       - 1% precision resistors are recommended

   2. PCB layout:

       - A/B differential pair spacing ≤ 2 times the line width

       - Avoid 90° corners (use 45° or arc)

   3. Protection circuit:

       - TVS tube (SMBJ6.5CA) is recommended for surge protection

       - Resettable fuse (such as 0603L050)

Electrical characteristics

   1. Common mode range: -7V to +12V

   2. Receiver hysteresis: 50mV (typical)

   3. Transmission delay: <1μs (Drive enable time)

Application scenarios

   1. Industrial automation:

       - MODBUS RTU slave device

       - PLC remote IO module

   2. Energy management:

       - Smart meter concentrator

       - PV inverter communication

   3. Building control:

       - BACnet MS/TP device

       - Elevator control system