Features and Benefits

  • Isolated Data Interface, Guaranteed to 1260VRMS (1min)
  • +15kV ESD Protection on I/O Pins
  • Slew-Rate Limited for Errorless Data Transmission (MAX1480EC/MAX1490EB)
  • High-Speed, Isolated, 2.5Mbps RS-485/RS-422 Interface (MAX1480EA/MAX1490EA)
  • Full-Duplex Data Communication
    • (MAX1490EA/MAX1490EB)
  • Single +5V Supply
  • Current Limiting and Thermal Shutdown for Driver Overload Protection
  • Standard 0.6in DIP Packages
    • 28-Pin DIP (MAX1480EA/MAX1480EC)
    • 24-Pin DIP (MAX1490EA/MAX1490EB)

Product Details

The MAX1480EA/MAX1480EC/MAX1490EA/MAX1490EB are complete, electrically isolated, RS-485/RS-422 data communications interface solutions in a hybrid microcircuit. The RS-485/RS-422 I/O pins are protected against ±15kV electrostatic discharge (ESD) shocks, without latchup. Transceivers, optocouplers, and a transformer provide a complete interface in a standard DIP package. A single +5V supply on the logic side powers both sides of the interface.

The MAX1480EC/MAX1490EB feature reduced-slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 160kbps. The MAX1480EA/MAX1490EA driver slew rate is not limited, allowing transmission rates up to 2.5Mbps. The MAX1480EA/MAX1480EC are designed for half-duplex communication, while the MAX1490EA/MAX1490EB feature full-duplex communication.

Drivers are short-circuit current limited and protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a known output (RO low for the MAX1480EA/MAX1480EC, active-low RO high for the MAX1490EA/ MAX1490EB) if the input is open circuit.

The MAX1480EA/MAX1480EC/MAX1490EA/MAX1490EB withstand 1260VRMS (1min) or 1520VRMS (1s). Their isolated outputs meet all RS-485/RS-422 specifications. The MAX1480EA/MAX1480EC are available in a 28-pin DIP package, and the MAX1490EA/MAX1490EB are available in a 24-pin DIP package.


  • Automated Test Equipment (ATE)
  • HVAC/Building Control Networks
  • Industrial Control Local Area Networks
  • Isolated RS-485/RS-422 Data Interface
  • Telecom
  • Transceivers for EMI-Sensitive Applications

Product Categories

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Product Recommendations

MAX1480EC Companion Parts

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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