MAX3080ESD+

Overview

The MAX3080ESD+ is a full-duplex RS-422/RS-485 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It integrates one driver and one receiver within a 14-pin SOIC package. The device supports data transmission rates up to 115kbps with slew-rate-limited drivers to minimize electromagnetic interference. It operates on a single +5V supply (4.75V to 5.25V) and draws a typical quiescent current of 375µA. Fail-safe circuitry ensures a logic-high receiver output when inputs are open or shorted, providing robust performance in industrial environments.

Feature Summary

• Fail-safe receiver circuitry guarantees a logic-high output state during bus idle conditions or input disconnection.
• Slew-rate-limited driver outputs reduce electromagnetic emissions and signal reflections on improperly terminated cables.
• High input impedance allows connection of up to 256 transceivers on a single communication bus line.

Applications

• RS-422 and RS-485 serial communication networks
• Industrial control local area networks
• Level translation interfaces for EMI-sensitive applications

Procurement Notes

Verify the specific suffix 'ESD+' against official manufacturer documentation to confirm the extended temperature range (-40°C to +85°C) and lead-free status. Confirm that the 14-SOIC package dimensions match the target PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component for full-duplex applications requiring error-free transmission at speeds up to 115kbps. The integrated fail-safe feature is critical for systems where transmitter disablement must result in a predictable high logic state. Ensure the system voltage remains within the specified 4.75V to 5.25V range for optimal electrical characteristics.

Part Context

This device belongs to the MAX3080–MAX3089 family of high-speed transceivers designed for RS-485/RS-422 standards. While other variants in the series offer half-duplex modes or higher speed capabilities via selectable slew rates, the MAX3080 is specifically configured for full-duplex operation with fixed low-speed limitations to optimize noise immunity.

Replacement Considerations

The datasheet notes pin compatibility with the industry-standard 75180 transceiver. Designers replacing legacy 75180 components should verify that the additional features implemented on pins 1, 6, 8, and 13 do not conflict with existing board layouts.

FAQ

How does the MAX3080 handle open or shorted receiver inputs?

The device incorporates fail-safe circuitry that guarantees a logic-high receiver output if the differential inputs (A-B) are open, shorted, or connected to a terminated line with all drivers disabled.

What is the maximum data rate supported by the MAX3080?

The MAX3080 supports a maximum data rate of 115kbps due to its reduced slew-rate driver design, which minimizes EMI and reflections.

Can multiple MAX3080 devices be connected to the same bus?

Yes, the 1/8-unit-load receiver input impedance allows up to 256 transceivers to be connected in parallel on a single communication line.