MAX1480EA, MAX1480EC:±15kV ESD-Protected, Isolated RS-485/RS-422 Data Interfaces

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.

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)
MAX1480E: Pin Configuration
MAX1480E: Pin Configuration
Applications/Uses
  • 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
DataSheet
titleDownload file
MAX1480E-MAX1490E Data SheetMAX1480E-MAX1490E.pdf
Parametrics
Part NumberTx/RxDuplexVSUPPLY
(V)
Galvanic Isolation
(±V)
ICC
(mA)
Data Rate
(kbps)
Tx ENRx ENICC (Shutdn.)
(µA)
Rx/Tx on BusRx Failsafe w/ InputsSlew Rate LimitingOper. Temp.
(°C)
Package/PinsBudgetary
Price
typmintypSee Notes
MAX1480EA1Tx + 1RxHalf51000852500YesNo0.2128OpenNo-40 to +85
0 to +70
PDIP(W)/28$18.90 @1k
MAX1480ECHalf55160Yes128PDIP(W)/28$18.90 @1k
MAX1490EAFull1302500No32PDIP(W)/24$15.68 @1k
MAX1490EBFull65160No32PDIP(W)/24$15.69 @1k
Related Products
  • MAX1480B:Complete, Isolated RS-485/RS-422 Data Interface
  • MAX1490B:Complete, Isolated RS-485/RS-422 Data Interface
  • MAX1490A:Complete, Isolated RS-485/RS-422 Data Interface
  • MAX1480C:Complete, Isolated RS-485/RS-422 Data Interface
  • MAX1480A:Complete, Isolated RS-485/RS-422 Data Interface
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX1480EACPINo Longer AvailableMAX1480EACPI+PDIP(W),;28 pin;592.6 mm²0°C to +70°CNo
MAX1480EACPI+ActivePDIP(W),;28 pin;592.6 mm²0°C to +70°CSee data sheet
MAX1480EAEPINo Longer AvailableMAX1480EAEPI+PDIP(W),;28 pin;592.6 mm²-40°C to +85°CNo
MAX1480EAEPI+ActivePDIP(W),;28 pin;592.6 mm²-40°C to +85°CSee data sheet
MAX1480E-MAX1490E.pdf MAX1490EB
MAX1480E-MAX1490E.pdf MAX1490EB