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
- 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)
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
- Transceivers for EMI-Sensitive Applications
Product Lifecycle 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.
Documentation & Resources
MAX1480E Reliability Data1/12/2023
Reduce the Chances of Human Error: Part 2, Super Amps and Filters for Analog Interface3/8/2011
Oops...Practical ESD Protection vs. Foolhardy Placebos3/2/2011
Understanding Common-Mode Signals6/29/2003
RS-485 (EIA/TIA-485) Differential Data Transmission System Basics11/19/2001
Guidelines for Proper Wiring of an RS-485 (TIA/EIA-485-A) Network11/19/2001
Analog Devices Leads the Way in ESD Protection10/3/2000
ESD Protection for I/O Ports3/13/2000
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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