1. Products
  2. Interface and Isolation
  3. RS-232 / RS-422 / RS-485 / RS-562
  4. RS-485 and RS-422
  5. ADM3491E


Features and Benefits

  • TIA/EIA RS-485/RS-422 compliant 
  • ±15 kV ESD-protection on RS-485 input/output pins 
  • Data rates - ADM3490E / ADM3491E: 12 Mbps 
  • Full duplex 
  • 32 nodes on the bus 
  • Receiver open-circuit, fail-safe design
  • Low power shutdown current (ADM3483E / ADM3486E / ADM3491E only) 
  • Outputs high-Z when disabled or powered off 
  • −7 V to +12 V common-mode input range 
  • Thermal shutdown and short-circuit protection 
  • Industry-standard 75176 pinout 
  • 14-lead SOIC package

Product Details

The ADM3483E / ADM3486E / ADM3488E / ADM3490E / ADM3491E are 3.3 V low power data transceivers with ±15 kV ESD protection suitable for full and half-duplex 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 ADM3483E / ADM3486E is a half-duplex transceiver that shares differential lines and has separate enable inputs for the driver and receiver. The full-duplex ADM3488E / ADM3490E / ADM3491E transceivers have dedicated differential line driver outputs and receiver inputs. The ADM3491E also features enable inputs for the driver and receiver.

The devices have a 12 kΩ receiver input impedance which allows up to 32 transceivers on a bus. Since only one driver should be enabled at any time, the output of a disabled or powered down driver is three-stated to avoid overloading the bus. The driver outputs of the ADM3483E / ADM3486E / ADM3488E are slew rate limited in order to reduce EMI and data errors caused by reflections from improperly terminated buses. The receiver has a failsafe feature which 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 parts are fully specified over the industrial temperature ranges and are available in narrow 8-lead and 14-lead (ADM3491E) SOIC packages.

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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
ADM3491EARZ Material Declaration Reliability Data 14-Lead SOIC
ADM3491EARZ-REEL7 Material Declaration Reliability Data 14-Lead SOIC
Wafer Fabrication Data

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.