MAX3081ESA+

Overview

The MAX3081ESA+ is a full-duplex RS-422/RS-485 transceiver in an 8-pin SOIC package. It contains one driver and one receiver with fail-safe circuitry guaranteeing a logic-high output when inputs are open or shorted. The device features reduced slew-rate drivers to minimize EMI, supporting error-free data transmission up to 115kbps. It operates from a single +5V supply (4.75V to 5.25V) and draws 375µA typical quiescent current. The receiver input impedance is 1/8-unit-load, allowing up to 256 transceivers on the bus.

Feature Summary

• Fail-safe circuitry ensures a logic-high receiver output during idle or fault conditions
• Slew-rate-limited drivers reduce electromagnetic interference and signal reflections
• High input impedance supports extensive network topologies with up to 256 nodes

Applications

• RS-422/RS-485 communications
• EMI-sensitive industrial applications
• Industrial-control local area networks

Procurement Notes

Verify the specific suffix 'ESA+' against the manufacturer's official ordering guide to confirm the exact temperature range and RoHS compliance status. Ensure the selected package variant matches the required PCB footprint for the 8-pin SOIC configuration.

Selection Notes

Select this component for full-duplex applications requiring low power consumption and noise immunity. The MAX3081 is suitable where data rates do not exceed 115kbps and reduced EMI is a priority over higher speed capabilities found in other family members.

Part Context

This part belongs to the MAX3080–MAX3089 series of high-speed transceivers designed for RS-485/RS-422 communication. The series offers various configurations including half-duplex options and selectable slew rates, providing flexibility for different industrial networking requirements.

Replacement Considerations

The datasheet notes pin compatibility with industry-standard parts like the 75180. Verify functional equivalence regarding threshold voltages and drive strength before substitution.

FAQ

What is the fail-safe behavior of the MAX3081?

The device guarantees a logic-high receiver output if the receiver inputs are open, shorted, or connected to a terminated line with all drivers disabled.

How does the MAX3081 handle EMI?

It utilizes reduced slew-rate drivers that minimize electromagnetic interference and reduce reflections caused by improperly terminated cables.

What is the maximum number of transceivers supported?

Due to its 1/8-unit-load receiver input impedance, the MAX3081 allows up to 256 transceivers to be connected on a single bus.