ADM3485EARZ-REEL7

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1. DESCRIPTION

The ADM3485EARZ-REEL7 is a 3.3 V, low power data transceiver with ±15 kV ESD protection, suitable for half-duplex communication on multipoint bus transmission lines. The ADM3485EARZ-REEL7 is designed for balanced data transmission and complies with TIA/EIA standards RS­485 and RS-422. The ADM3485EARZ-REEL7 is a half-duplex transceiver that shares differential lines and has separate enable inputs for the driver and the receiver. The devices have a 12 kΩ receiver input impedance, which allows up to 32 transceivers on a bus. Because only one driver should be enabled at any time, the output of a disabled or powered-down driver is tristated to avoid overloading the bus. The receiver has a fail-safe feature that ensures a logic high output when the inputs are floating. Excessive power dissipation caused by bus contention or by output shorting is prevented with a thermal shutdown circuit. The part is fully specified over the industrial temperature range and is available in an 8-lead narrow SOIC package.

2. FEATURES

    1. TIA/EIA RS-485/RS-422 compliant

    2. ±15 kV ESD protection on RS-485 input/output pins

    3. 12 Mbps data rate

    4. Half-duplex transceiver

    5. Up to 32 nodes on the bus

    6. Receiver open-circuit, fail-safe design

    7. Low power shutdown current

    8. Outputs high-Z when disabled or powered off

    9. Common-mode input range: −7 V to +12 V

  10. Thermal shutdown and short-circuit protection

  11. Industry-standard 75176 pinout

  12. 8-lead narrow SOIC package

3. APPLICATIONS

    1. Power/energy metering

    2. Telecommunications

    3. EMI-sensitive systems

    4. Industrial control

    5. Local area networks