Maxim > Products > Interface > MAX1480E, MAX1490E

MAX1480E, MAX1490E

±15kV ESD-Protected, Isolated RS-485/RS-422 Data Interfaces

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Active: In Production.


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.

Data Sheet

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Key Features

  • 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)


  • 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

Key Specifications:

RS-422/485 Line Driver/Receivers
Part Number Tx/Rx Duplex VSUPPLY
Galvanic Isolation
Data Rate
Tx EN Rx EN ICC (Shutdn.)
Rx/Tx on Bus Budgetary
typ min typ See Notes
MAX1480EA  1Tx + 1Rx Half 5 1000 85 2500 Yes No 0.2 128 $18.90 @1k
MAX1480EC  Half 55 160 Yes 128 $18.90 @1k
MAX1490EA  Full 130 2500 No 32 $15.68 @1k
MAX1490EB  Full 65 160 No 32 $15.69 @1k
See All RS-422/485 Line Driver/Receivers (171)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX1480E: Pin Configuration
Pin Configuration

MAX1490E: Pin Configuration
Pin Configuration

More Information

New Product Press Release   2001-11-06 ]

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Information Index

Document Ref.: 19-1940 Rev 0; 2001-10-31
This page last modified: 2009-10-15