ADM487E:  5 V, 128 Nodes, ±15 kV ESD-Protected, 250kps Half-Duplex Transceiver

The ADM485E/ADM487E/ADM1487E are 5 V low power data transceivers with ±15 kV ESD protection suitable for halfduplex communication on multipoint bus transmission lines. They are designed for balanced ...More

ADM487E:  5 V, 128 Nodes, ±15 kV ESD-Protected, 250kps Half-Duplex Transceiver

Product Description

The ADM485E/ADM487E/ADM1487E are 5 V low power data transceivers with ±15 kV ESD protection suitable for halfduplex communication on multipoint bus transmission lines. They are designed for balanced data transmission and comply with TIA/EIA standards RS-485 and RS-422. The ADM487E and the ADM1487E have a 1/4 unit load receiver input impedance that allows up to 128 transceivers on a bus, while the ADM485E allow up to 32 transceivers on a bus. Since only one driver is enabled at any time, the output of a disabled or powerdown driver is three-stated to avoid overloading the bus.

The driver outputs are slew rate-limited in order to reduce EMI and data errors caused by reflections from improperly terminated buses. Excessive power dissipation caused by bus contention or output shorting is prevented with a thermal shutdown circuit. The parts are fully specified over the industrial temperature ranges and are available in 8-lead SOIC packages

Applications

  • Energy/power metering
  • Lighting systems
  • Industrial control
  • Telecommunications
  • Security systems
  • Instrumentation

    • Features

    • TIA/EIA RS-485/RS-422 compliant
    • ESD protection on RS-485 I/O pins
    • ±15 kV human body model
    • Data rates: 250 kbps
    • Half-duplex options
    • Reduced slew rates for low EMI
    • −7 V to +12 V common-mode input range
    • Thermal shutdown and short-circuit protection
    • 8-lead SOIC packages

    Diagrams

    ADM487E Diagram
    Functional Block Diagram for ADM487E

    Specifications

    Protocols RS-422,RS-485
    Pwr Supply (Vnom) +5
    #Tx 1
    # Rx 1
    Data Rate 250kbps
    Low Power Shutdown Yes
    Operating Temp Range -25 to +85

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