MAX3089ECSD+

Overview

The MAX3089ECSD+ is a ±15kV ESD-protected, fail-safe RS-485/RS-422 transceiver in a 14-pin SOIC package. It supports selectable half-duplex and full-duplex modes via the H/F pin. Data rates are programmable to 115kbps, 500kbps, or 10Mbps using the SRL pin. Independent phase inversion for transmitter (TXP) and receiver (RXP) outputs corrects twisted-pair reversals. The device operates on a single +5V supply with a typical quiescent current of 375µA and includes thermal shutdown protection.

Feature Summary

• Pin-selectable half-duplex and full-duplex operation
• Programmable slew-rate limiting for data rate selection
• Independent transmitter and receiver phase control pins
• Enhanced ±15kV ESD protection on all I/O pins

Applications

• RS-422/RS-485 communications
• Level translators
• Transceivers for EMI-sensitive applications
• Industrial-control local area networks

Procurement Notes

Verify the specific suffix 'CSD+' against official documentation to confirm the 14-SOIC package and industrial temperature range (-40°C to +85°C). Ensure the ordering code matches the exact manufacturer specifications before procurement to avoid compatibility issues with interface requirements.

Selection Notes

Select this component when flexible duplex mode and adjustable transmission speeds are required within a single package. The independent phase control pins provide a hardware solution for correcting wiring errors without software intervention. 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 MAX3080E–MAX3089E family of high-speed transceivers. Unlike fixed-function variants, the MAX3089E integrates multiple operational modes into one part number. It serves as a versatile alternative to standard industry components like the 75180, offering enhanced configurability through dedicated selector pins.

Replacement Considerations

The datasheet confirms pin compatibility with the industry-standard 75180 component. Designers replacing legacy parts should verify that the additional configuration pins (SRL, H/F, TXP, RXP) are properly terminated or driven according to the desired operating mode.

FAQ

How is the data rate selected on the MAX3089ECSD+?

The data rate is determined by the state of the SRL pin. Leaving it unconnected sets the rate to 115kbps, connecting it to VCC selects 500kbps, and connecting it to GND enables 10Mbps operation.

Can the MAX3089ECSD+ operate in both half-duplex and full-duplex modes?

Yes, the duplex mode is selectable via the H/F pin. Driving H/F high configures the device for half-duplex, while driving it low or leaving it unconfigured sets it to full-duplex.

What is the function of the TXP and RXP pins?

These pins allow independent phase inversion for the transmitter and receiver. Connecting them to VCC inverts the respective output polarity, which helps correct signal issues caused by reversed twisted-pair cabling.