MAX3084EESA+T

Overview

The MAX3084EESA+T is a full-duplex RS-422/RS-485 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It contains one driver and one receiver, supporting data rates up to 500kbps with slew-rate limiting enabled via the SRL pin. The device operates on a single +5V supply (4.75V to 5.25V) and draws 375µA typical quiescent current. It 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. Packaged in an 8-pin SOIC, it supports operation from -40°C to +85°C.

Feature Summary

• Fail-safe receiver circuitry ensures a logic-high output state during bus idle conditions or input disconnection.
• Slew-rate-limited driver outputs minimize electromagnetic interference and reduce signal reflections on improperly terminated cables.
• Enhanced electrostatic discharge protection rated at ±15kV Human Body Model across all transmitter and receiver pins.

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 'T' indicates tape-and-reel packaging versus tube packaging for the base part number. Confirm the 'E' designation corresponds to the industrial temperature range of -40°C to +85°C. Ensure the component source matches the official manufacturer specifications for the MAX3084 series.

Selection Notes

Select this component for full-duplex applications requiring data transmission speeds up to 500kbps. It is suitable for environments where reduced electromagnetic emissions are critical due to its internal slew-rate limiting. Ensure the system design accommodates the standard 8-pin SOIC footprint and +5V power requirements.

Part Context

This device belongs to the MAX3080E–MAX3089E family of high-speed transceivers. While sharing the same package and core functionality, variants within this series differ primarily in duplex mode support and maximum achievable data rates based on their specific slew-rate configurations.

Replacement Considerations

The datasheet notes pin compatibility with industry-standard parts like the 75180. Verify functional equivalence regarding the specific 500kbps slew-rate limit and full-duplex architecture before substitution.

FAQ

How is the 500kbps data rate achieved?

The MAX3084E achieves a maximum data rate of 500kbps by utilizing internally limited driver slew rates, which are optimized for this speed class compared to the 115kbps or 10Mbps variants in the same family.

What happens if the receiver inputs are left unconnected?

The integrated fail-safe circuitry guarantees that the receiver output will remain in a logic-high state if the differential inputs (A and B) are open, shorted, or connected to a terminated line with no active drivers.