MAX3078EESA+T

Overview

The MAX3078EESA+T is a half-duplex RS-485 transceiver operating from a single +3.3V supply. It features one driver and one receiver with a maximum data rate of 16Mbps. The device includes ±15kV ESD protection on I/O pins, fail-safe circuitry ensuring a logic-high output when inputs are open or shorted, and hot-swap capability to prevent false transitions during power-up. It operates within a temperature range of -40°C to +85°C and draws a typical supply current of 1.5mA.

Feature Summary

• Hot-swap input structure prevents erroneous bus transitions during board insertion or power-up sequences.
• Fail-safe receiver guarantees a logic-high output state when differential inputs are open, shorted, or disconnected.
• Unlimited slew-rate drivers support high-speed data transmission up to 16Mbps without signal reflection limitations.

Applications

• Industrial control systems
• Telecommunications equipment
• Security systems
• Instrumentation

Procurement Notes

Verify the specific suffix 'EESA+T' against official Analog Devices documentation to confirm the SOIC-8 package, industrial temperature grade, and tape-and-reel packaging configuration. Ensure compatibility with existing PCB footprints and verify RoHS compliance status through the manufacturer's current certification records before finalizing procurement orders.

Selection Notes

Select this component for applications requiring high-speed half-duplex communication at 16Mbps over RS-485 networks. It is suitable for environments where hot-swap functionality and robust fail-safe behavior are critical. Verify that the system operates exclusively at 3.3V, as the device does not support other voltage levels or full-duplex configurations.

Part Context

This part belongs to the MAX3070E–MAX3079E family of +3.3V RS-485 transceivers. Unlike the MAX3072E or MAX3075E, which feature slew-rate limiting for lower speeds, the MAX3078E provides unrestricted driver slew rates to achieve the 16Mbps maximum data rate specified in the datasheet.

Replacement Considerations

The MAX3077EESA+T is a full-duplex variant within the same family offering identical 16Mbps performance and pinout compatibility. Designers must account for the difference between half-duplex (MAX3078E) and full-duplex (MAX3077E) operation modes when substituting components.

FAQ

What is the receiver output state when the inputs are open?

The fail-safe circuitry guarantees a logic-high receiver output when the receiver inputs are open or shorted.

How does the device handle hot-swap conditions?

Internal pull-down and pull-up circuits hold the DE and RE inputs in safe states during power-up to eliminate false transitions on the bus.

Is the MAX3078E capable of full-duplex communication?

No, the MAX3078E is designed specifically for half-duplex communications.