MAX14776EATA+

Drivers, Receivers, Transceivers Overview

The MAX14776EATA+T is a half-duplex RS-485/RS-422 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It features ±65V fault protection on driver outputs and receiver inputs, ensuring robust communication in harsh industrial environments. The device operates from a single 3V to 5.5V supply and supports data rates up to 500kbps with slew-rate limited outputs. It includes one driver and one receiver with a 1/3-unit load input impedance, allowing up to 100 devices on a bus. The component provides fail-safe functionality, hot-swap protection, and thermal shutdown. It is housed in an 8-pin TDFN-EP package and operates over a temperature range of -40°C to +125°C.

Drivers, Receivers, Transceivers Feature Summary

• Integrated ±65V fault protection for driver outputs and receiver inputs ensures reliable operation during voltage faults.
• Slew-rate limited outputs optimize signal integrity and reduce electromagnetic interference at data rates up to 500kbps.
• Fail-safe receiver guarantees a logic-high output when inputs are open or shorted, enhancing noise immunity.

Drivers, Receivers, Transceivers Applications

• Industrial field bus networks
• Motion controllers
• HVAC systems

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix '+T' corresponds to the tape and reel packaging format required for automated assembly processes. Confirm that the 'E' designation indicates the extended temperature range capability suitable for industrial applications. Ensure compatibility with the 8-pin TDFN-EP footprint during PCB layout verification.

Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring high-voltage fault tolerance on RS-485 or RS-422 buses. It is appropriate for noisy industrial environments where standard transceivers might fail due to overvoltage conditions. Choose this part over the MAX14775E if the application requires lower data rates but benefits from reduced signal ringing due to slew-rate limiting.

Drivers, Receivers, Transceivers Part Context

This component belongs to the MAX14775E/MAX14776E series of fault-protected transceivers. It shares the same physical package and pinout as the MAX14775E variant, differing primarily in electrical performance specifications regarding maximum data rate and output slew rate characteristics.

Drivers, Receivers, Transceivers Replacement Considerations

The MAX14776EASA+ serves as a direct pin-compatible alternative packaged in 8-pin SOIC instead of TDFN-EP. Designers must verify thermal dissipation requirements and board space constraints when substituting between these package types.

Drivers, Receivers, Transceivers FAQ

How does the MAX14776EATA+T handle overvoltage faults on the A and B lines?

The device withstands voltages up to ±65V on the A and B pins without damage. If a fault persists, the affected driver output switches to a high-impedance state and periodically attempts to re-enable after a typical delay of 300ms.

What is the purpose of the fail-safe feature in this transceiver?

The fail-safe feature ensures that the receiver output (RO) goes high when the receiver inputs are open, shorted, or connected to a terminated line with all drivers disabled for longer than 10μs, preventing undefined states in noisy environments.

Does the MAX14776EATA+T support hot-swapping?

Yes, it includes hot-swap input circuitry on the DE and RE pins. An internal pulldown/pullup mechanism holds these pins in safe states during power-up sequences to prevent unintended driver activation when inserting boards into powered backplanes.