MAX14776EASA+

Drivers, Receivers, Transceivers Overview

The MAX14776EASA+ is a half-duplex RS-485/RS-422 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single 3V to 5.5V supply and features ±65V fault protection on driver outputs and receiver inputs. The device supports data rates up to 500kbps with slew-rate limited outputs. It includes one driver and one receiver, offering a 1/3-unit load input impedance that allows up to 100 devices on a bus. The component operates over an extended temperature range of -40°C to +125°C and is housed in an 8-pin SOIC package.

Drivers, Receivers, Transceivers Feature Summary

• Integrated ±65V fault protection ensures robust communication in harsh industrial environments without external components.
• Slew-rate limited outputs optimize signal integrity for data rates up to 500kbps.
• High noise tolerance provided by large receiver hysteresis and fail-safe logic ensuring a high output when inputs are open or shorted.
• Hot-swap functionality protects against data errors during board insertion into powered backplanes.

Drivers, Receivers, Transceivers Applications

• Industrial field bus networks
• Motion controllers
• HVAC systems

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix to confirm the package type and reel configuration. The 'ASA' designation indicates an 8-pin SOIC package, while '+T' denotes tape and reel packaging. Confirm RoHS compliance status through official manufacturer documentation before finalizing procurement specifications.

Drivers, Receivers, Transceivers Selection Notes

Select the MAX14776EASA+ when designing systems requiring ±65V fault protection combined with data rates up to 500kbps. This model is distinct from the MAX14775E, which supports higher speeds up to 20Mbps. Ensure the application benefits from the integrated thermal shutdown and hot-swap capabilities for enhanced reliability.

Drivers, Receivers, Transceivers Part Context

This component belongs to the MAX14775E/MAX14776E series of fault-protected RS-485/RS-422 transceivers. The series is designed for multipoint bus transmission lines where robustness against voltage faults and electrical noise is critical. The MAX14776 variant specifically targets applications prioritizing noise immunity and fault tolerance over maximum throughput.

Drivers, Receivers, Transceivers Replacement Considerations

The MAX14775EASA+ serves as a direct functional substitute within the same family, differing primarily in its support for data rates up to 20Mbps instead of 500kbps. Both share identical pinouts, packages, and fault protection specifications.

Drivers, Receivers, Transceivers FAQ

How does the MAX14776E handle open or shorted receiver inputs?

The device incorporates a fail-safe feature that guarantees a logic-high state on the receiver output (RO) when the A and B inputs are open, shorted, or connected to a terminated line with all drivers disabled for longer than the typical delay time.

What is the purpose of the hot-swap circuitry in this transceiver?

The hot-swap circuitry safeguards against unwanted driver activation during board insertion into powered backplanes. It uses internal pulldown/pullup circuits to hold DE low and RE high during power-up, preventing data errors caused by transient voltages.

Can the MAX14776E withstand voltage faults while in shutdown mode?

Yes, the ±65V fault protection is guaranteed regardless of whether the transceiver is active, in shutdown mode, or completely unpowered.