MAX1480AEPI+

Drivers, Receivers, Transceivers Overview

The MAX1480AEPI+ is a complete, electrically isolated RS-485/RS-422 data-communications interface solution housed in a 28-pin wide plastic DIP package. It integrates transceivers, optocouplers, and a transformer to provide isolation between the logic side and the isolated bus side. The device supports half-duplex communication with a maximum data rate of 2.5 Mbps. It operates on a single +5V supply (4.5V to 5.5V) and functions within an industrial temperature range of -40°C to +85°C. The driver slew rate is not limited, enabling high-speed transmission.

Drivers, Receivers, Transceivers Feature Summary

• Provides complete electrical isolation using integrated optocouplers and a transformer for signal and power transfer across the barrier.
• Features fail-safe receiver inputs that guarantee a known output state when the differential input pins are left open.
• Includes thermal shutdown circuitry to protect drivers from excessive power dissipation by placing outputs in a high-impedance state.
• Offers short-circuit current limiting on the driver outputs to prevent damage during fault conditions.

Drivers, Receivers, Transceivers Applications

• Isolated RS-485/RS-422 data interfaces
• Transceivers for EMI-sensitive applications
• Industrial-control local area networks
• Automatic test equipment
• HVAC and building control networks

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'E' confirms the extended temperature range of -40°C to +85°C and the 'P' indicates the 28-pin PDIP package. Confirm RoHS compliance status as indicated in the ordering information. Ensure the logic-side ground connections match the design requirements for the non-isolated side.

Drivers, Receivers, Transceivers Selection Notes

Select this component for half-duplex applications requiring up to 2.5 Mbps data rates. The MAX1480A variant lacks slew-rate limiting, which suits high-speed needs but may increase EMI compared to the MAX1480B or C variants. Ensure the application can accommodate the 28-pin DIP footprint and the specific resistor values required for the internal LED drive circuits.

Drivers, Receivers, Transceivers Part Context

This part belongs to the MAX1480A/B/C family of isolated RS-485/RS-422 interfaces. It is distinct from the MAX1490A/B series, which provides full-duplex communication in a 24-pin package. The MAX1480A specifically differentiates itself from the B and C variants by offering unrestricted driver slew rates for higher data throughput.

Drivers, Receivers, Transceivers Replacement Considerations

MAX1480ACPI+ is a parameter-equivalent alternative with a commercial temperature range (0°C to +70°C). Verify that the reduced temperature range meets the operational requirements before substitution.

Drivers, Receivers, Transceivers FAQ

How does the MAX1480AEPI+ handle an open receiver input?

The receiver includes a fail-safe feature that guarantees a known output state (RO low) if the A and B input pins are left open circuit.

What is the function of the FS pin?

The Frequency Select (FS) pin allows selection between high and low switching frequencies for the isolated power driver. Connecting it to VCC or leaving it open selects the high-frequency mode.

Does the MAX1480AEPI+ support full-duplex communication?

No, the MAX1480A/B/C series is designed exclusively for half-duplex communication. Full-duplex options are available in the MAX1490A/B series.