MAX3089ESD+

Overview

The MAX3089ESD+ is a high-speed RS-485/RS-422 transceiver featuring one driver and one receiver in a 14-pin SOIC package. It operates from a single +5V supply (4.75V to 5.25V) with a typical quiescent current of 375µA. The device supports selectable data rates up to 10Mbps via the SRL pin, configurable half/full-duplex modes via the H/F pin, and independent transmitter/receiver phase inversion via TXP and RXP pins. It includes fail-safe circuitry guaranteeing a logic-high output when inputs are open or shorted.

Feature Summary

• Configurable communication modes including selectable half-duplex or full-duplex operation and programmable slew-rate limits for data rates ranging from 115kbps to 10Mbps.
• Integrated fail-safe receiver circuitry that ensures a logic-high output state when differential inputs are floating, open, or shorted.
• Independent phase control capabilities allowing separate inversion of transmitter and receiver signal polarities to accommodate reversed cabling.

Applications

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

Procurement Notes

Verify the specific suffix 'ESD+' against the manufacturer's official ordering guide to confirm the exact temperature range and packaging configuration. Ensure the component matches the required RoHS compliance standards for your assembly process. Cross-reference the datasheet revision date to confirm the accuracy of electrical specifications before finalizing procurement.

Selection Notes

Select this component when flexible bus topology is required, as it allows switching between half-duplex and full-duplex modes on the same pin footprint. Consider the programmable slew rate if EMI reduction at lower speeds is necessary alongside high-speed capability. Verify that the system power supply remains within the specified 4.75V to 5.25V range for optimal performance.

Part Context

This device belongs to the MAX3080–MAX3089 family of high-speed transceivers designed for RS-485 and RS-422 applications. Unlike fixed-function variants in the series, the MAX3089 offers unique configurability through dedicated selector pins, providing design flexibility for varying baud rates and duplex requirements without changing the physical package layout.

Replacement Considerations

The MAX3089 is pin-compatible with industry-standard parts like the 75180, though additional features utilize specific pins. Direct replacements should be verified against the official selection table for equivalent data rates and duplex modes.

FAQ

How is the data rate selected on the MAX3089?

The data rate is determined by the voltage level on the SRL pin: connect to GND for 10Mbps, VCC for 500kbps, or leave unconnected for 115kbps.

What is the function of the H/F pin?

The H/F pin selects the communication mode; connecting it to VCC enables half-duplex operation, while connecting it to GND or leaving it unconnected enables full-duplex operation.

How does the fail-safe feature work?

The receiver guarantees a logic-high output if the differential input voltage (A-B) is greater than or equal to -50mV, which occurs when inputs are open, shorted, or disconnected.