MAX3085EEPA+

Overview

The MAX3085EEPA+ is a half-duplex RS-485/RS-422 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single +5V supply and supports data rates up to 500kbps with slew-rate-limited drivers. The device features ±15kV ESD protection on all I/O pins and fail-safe circuitry that guarantees a logic-high receiver output when inputs are open or shorted. It incorporates a 1/8-unit-load receiver input impedance, allowing up to 256 transceivers on the bus. The component is housed in an 8-pin PDIP package and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Fail-safe receiver circuitry ensures a logic-high output during idle or fault conditions
• Slew-rate limiting minimizes electromagnetic interference and signal reflections
• Enhanced electrostatic discharge protection rated at ±15kV for robust industrial operation

Applications

• RS-422 and RS-485 communication networks
• Industrial control local area networks
• EMI-sensitive applications requiring controlled signal transitions

Procurement Notes

Verify the specific suffix EEPA+ against official documentation to confirm the extended temperature range (-40°C to +85°C) and PDIP-8 packaging. Confirm RoHS compliance status through current manufacturer certificates as product specifications may evolve over time.

Selection Notes

Select this component for half-duplex systems requiring 500kbps transmission speeds. Ensure the application environment stays within the specified -40°C to +85°C operating range. Verify that the system power supply remains stable between 4.75V and 5.25V for optimal performance.

Part Context

This part belongs to the MAX3080E–MAX3089E family of high-speed transceivers. It shares pin compatibility with industry-standard devices like the SN75180 but includes enhanced ESD protection and fail-safe features. The 'E' suffix denotes the extended temperature range, while 'PA+' indicates the plastic DIP package and lead-free construction.

Replacement Considerations

Pin-compatible alternatives include the SN75180. Cross-reference electrical characteristics such as slew rate limits and ESD ratings before substitution to ensure functional equivalence in existing designs.

FAQ

How does the MAX3085EEPA+ handle open or shorted receiver inputs?

The device features fail-safe circuitry that guarantees a logic-high receiver output when the receiver inputs are open, shorted, or connected to a terminated line with all drivers disabled.

What is the maximum data rate supported by the MAX3085EEPA+?

The MAX3085EEPA+ supports transmit speeds up to 500kbps due to its higher driver output slew-rate limits compared to the 115kbps variants in the same family.

Does the MAX3085EEPA+ support full-duplex operation?

No, the MAX3085EEPA+ is designed specifically for half-duplex communications. Full-duplex variants in this family include the MAX3080E and MAX3083E.