MAX3443ECSA+

Overview

The MAX3443ECSA+ is a half-duplex RS-485 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single +4.75V to +5.25V supply and supports data rates up to 10Mbps. The device integrates one differential driver and one differential receiver within an 8-pin SOIC package. Key electrical specifications include ±15kV ESD protection on the A and B pins, ±60V fault protection capability, and a true fail-safe receiver input that guarantees a logic-high output when inputs are open or shorted. The component features hot-swap circuitry for telecom applications and low-power shutdown mode.

Feature Summary

• Integrated ±60V fault protection on communication bus lines
• Hot-swap capability prevents false transitions during backplane insertion
• True fail-safe receiver inputs ensure logic-high output under fault conditions
• On-chip ±15kV ESD protection eliminates external protection requirements

Applications

• RS-422/RS-485 communications
• Industrial networks
• Telecommunications systems
• HVAC controls

Procurement Notes

Verify the specific suffix 'CSA+' against official manufacturer documentation to confirm exact temperature range and packaging details. Ensure compatibility with existing board layouts regarding the 8-pin SOIC footprint. Confirm RoHS compliance status through current datasheets before finalizing procurement orders.

Selection Notes

Select this component for designs requiring high-speed data transmission up to 10Mbps with robust fault protection. The MAX3443E variant specifically offers guaranteed 10Mbps performance unlike slew-rate limited models. Consider the automotive temperature range if operating in harsh environments. Verify pinout compatibility with industry-standard RS-485 interfaces.

Part Context

This part belongs to the MAX3440E–MAX3444E family of fault-protected transceivers. The MAX3443E designation indicates support for data rates up to 10Mbps with separate Driver Enable (DE) and Receiver Enable (RE) control pins. It is designed for multipoint bus transmission lines where high noise immunity and fault tolerance are critical.

Replacement Considerations

MAX3443EESA+

FAQ

What is the function of the FAULT pin?

The FAULT pin outputs a logic high signal when a fault condition is detected on the A or B lines, such as a short between them or voltages outside the common-mode range.

How does the device handle hot-swap situations?

Internal circuitry holds the DE input low until VCC rises sufficiently, preventing unwanted driver activation and data errors during board insertion into a live backplane.

What is the maximum number of transceivers supported on a single bus?

The 1/4-unit-load receiver input impedance allows up to 128 transceivers to be connected on a single communication bus.