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

4. Pin Configuration/Typical Application Circuit

5. Pull-up and pull-down resistors

Pull-up and pull-down resistors on the A and B lines Necessary for the normal operation of the equipment Although their exact value is not important. Their function Keep the bus in the high state (A-B> 200mV) after transitioning from low to high. The dimensions of these resistors are Determined in the same way as when using any other method The RS-485 driver depends on how the line is terminated and how many nodes there are on the bus. most An important factor in determining the size of these resistors is to ensure that the free voltage on the bus (A-B) is greater 200mV to maintain compatibility with standard RS-485 receiver thresholds.