MAX3070EESD+T

Overview

The MAX3070EESD+T is a +3.3V, ±15kV ESD-protected, fail-safe, hot-swap RS-485 transceiver featuring one driver and one receiver. It operates within a supply voltage range of 2.97V to 3.63V and supports data rates up to 250kbps with reduced slew-rate drivers. The device draws 800µA typical supply current and enters a shutdown mode consuming 10µA maximum. It provides ±250mA short-circuit output current and features propagation delays ranging from 250ns to 1500ns. Operating temperatures span from -40°C to +85°C.

Feature Summary

• Integrated hot-swap capability on DE and RE inputs prevents false bus transitions during power-up or board insertion.
• Fail-safe receiver circuitry guarantees a logic-high output when inputs are open, shorted, or disconnected.
• Reduced slew-rate drivers minimize electromagnetic interference (EMI) and signal reflections for error-free transmission.
• Robust protection includes ±15kV human body model ESD tolerance on all I/O pins.

Applications

• Industrial control systems
• Telecommunications equipment
• Security and alarm systems
• Lighting control networks

Procurement Notes

Verify the specific suffix 'ESD+' against official Analog Devices documentation to confirm package type and RoHS compliance status. Confirm that the ordering information matches the exact pin configuration required for the target application design.

Selection Notes

Select this component for applications requiring full-duplex RS-485 communication at speeds up to 250kbps. Ensure the system operates on a single 3.3V supply and requires integrated thermal shutdown protection alongside high ESD immunity for robust field performance.

Part Context

This part belongs to the MAX3070E–MAX3079E family of +3.3V RS-485/RS-422 transceivers. While sharing core features like fail-safe operation and hot-swap inputs, variants in this series differ by duplex mode, maximum data rate capabilities, and slew-rate limiting configurations.

Replacement Considerations

Direct functional replacements within the same family include MAX3070EESA+ and MAX3070EUD+. Verify package dimensions and pinout compatibility before substitution.

FAQ

How does the MAX3070E handle bus contention during hot insertion?

The device features dedicated hot-swap inputs on the DE and RE pins. Internal circuitry holds the driver disabled and receiver enabled until VCC stabilizes, preventing erroneous data transmission during board insertion into a powered backplane.

What is the fail-safe threshold behavior of the receiver?

The receiver guarantees a logic-high output if the differential input voltage (A-B) is greater than or equal to -50mV. If the input is less than or equal to -200mV, it outputs a logic-low. This ensures a defined state when inputs are open or shorted.

Does the MAX3070E support half-duplex operation?

No, the MAX3070E is specifically designed for full-duplex communications. Half-duplex variants within this family include the MAX3072E, MAX3075E, and MAX3078E.