MAX3480EA:±15kV ESD-Protected, Isolated, 3.3V RS-485/RS-422 Data Interfaces

The MAX3480EA/MAX3480EB are electrically isolated RS-485/RS-422 data-communications interfaces. The RS-485/RS-422 I/O pins are protected against ±15kV electrostatic discharge (ESD) shocks, without latchup. Transceivers, optocouplers, and a transformer are all included in one low-cost, 28-pin PDIP package. A single +3.3V supply on the logic side powers both sides of the interface. The MAX3480EB features 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 MAX3480EA's driver slew rate is not limited, allowing transmission rates up to 2.5Mbps. Drivers are short-circuit current limited and are 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 logic-high output if the input is open circuit. The MAX3480EA/MAX3480EB are guaranteed to withstand 1260VRMS (1min) or 1520VRMS (1s). Their isolated inputs and outputs meet RS-485/RS-422 specifications.

Key Features
  • Isolated Data Interface Guaranteed to 1260VRMS (1min)
  • ±15kV ESD Protection for I/O Pins
  • Slew-Rate-Limited Data Transmission (160kbps for MAX3480EB)
  • High-Speed, Isolated, 2.5Mbps RS-485 Interface (MAX3480EA)
  • Single +3.3V Supply
  • Current Limiting and Thermal Shutdown for Driver Overload Protection
  • Standard 28-Pin PDIP Package
  • Allows Up to 128 Transceivers on the Bus
MAX3480EA, MAX3480EB: Typical Application Circuit
MAX3480EA, MAX3480EB: Typical Application Circuit
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
MAX3480EA-MAX3480EB Data SheetMAX3480EA-MAX3480EB.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
MAX3480EA1Tx + 1RxHalf3.310001302500YesNo0.2128OpenNo-40 to +85
0 to +70
PDIP(W)/28$20.71 @1k
MAX3480EB80160PDIP(W)/28
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX3480EACPINo Longer AvailableMAX3480EACPI+PDIP(W),;28 pin;592.6 mm²0°C to +70°CNo
MAX3480EACPI+ActivePDIP(W),;28 pin;592.6 mm²0°C to +70°CSee data sheet
MAX3480EAEPINo Longer AvailableMAX3480EAEPI+PDIP(W),;28 pin;592.6 mm²-40°C to +85°CNo
MAX3480EAEPI+ActivePDIP(W),;28 pin;592.6 mm²-40°C to +85°CSee data sheet
MAX3480EA-MAX3480EB.pdf MAX3480EB
MAX3480EA-MAX3480EB.pdf MAX3480EB