MAX1490EA, MAX1490EB

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

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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.
MAX1480E: Pin Configuration MAX1480E: Pin Configuration Enlarge+

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

See parametric specs for RS-485/RS-422 Line Driver/Receivers (208)

Part NumberTx/RxDuplexVSUPPLY
Galvanic Isolation
Data Rate
Tx ENRx ENICC (Shutdn.)
Rx/Tx on BusRx Failsafe w/ InputsSlew Rate LimitingOper. Temp.
typmintypSee Notes
MAX1480EA 1Tx + 1RxHalf51000852500YesNo0.2128OpenNo
-40 to +85
0 to +70
$18.90 @1k
MAX1480EC Half55160Yes128
$18.90 @1k
MAX1490EA Full1302500No32
$15.68 @1k
MAX1490EB Full65160No32
$15.69 @1k

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.
Request Reliability Report for: MAX1490EA  MAX1490EB 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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