MAX3070EASD+

Overview

The MAX3070EASD+ is a full-duplex RS-485 transceiver operating from a single +3.3V supply. It features one driver and one receiver with fail-safe circuitry that guarantees a logic-high output when inputs are open or shorted. The device includes hot-swap capability on the DE and RE pins to prevent false transitions during power-up. It supports data rates up to 250kbps with slew-rate-limited drivers to minimize EMI. The component provides ±15kV Human Body Model ESD protection on I/O pins, operates within a temperature range of -40°C to +125°C, and draws 800μA of supply current when unloaded.

Feature Summary

• Integrated hot-swap input structure on DE and RE pins eliminates false bus transitions during board insertion or power-up sequences.
• Fail-safe receiver design ensures a logic-high output state when differential inputs are open, shorted, or connected to a terminated bus with all transmitters disabled.
• Slew-rate-limited driver outputs reduce electromagnetic interference (EMI) and signal reflections caused by improperly terminated cables.
• Robust protection architecture includes ±15kV Human Body Model ESD tolerance on all I/O pins.

Applications

• Industrial control systems
• Telecommunications equipment
• Security systems
• Lighting systems

Procurement Notes

Verify the specific suffix 'ASD+' against the manufacturer's official documentation to confirm the package type and tape-and-reel configuration. Ensure the ordering information matches the required industrial temperature range (-40°C to +125°C). Cross-reference the datasheet revision date to confirm the availability of the latest electrical characteristics and pin descriptions before finalizing procurement.

Selection Notes

Select this component for applications requiring full-duplex RS-485 communication at speeds up to 250kbps. It is suitable for environments where hot-swap functionality is necessary to protect the bus during module insertion. The device is appropriate for designs needing robust ESD protection and fail-safe behavior without the complexity of half-duplex switching or higher-speed slew rate configurations found in other family members.

Part Context

This part belongs to the MAX3070E–MAX3079E family of +3.3V, ±15kV ESD-protected, fail-safe, hot-swap RS-485 transceivers manufactured by Analog Devices/Maxim Integrated. The family encompasses both half-duplex and full-duplex variants with selectable or fixed slew rates ranging from 250kbps to 16Mbps. The MAX3070E specifically denotes the full-duplex variant with fixed 250kbps slew-rate limiting.

Replacement Considerations

The MAX3071EASD+ serves as a direct replacement if shutdown mode is not required, as it lacks the 10µA shutdown feature. For applications requiring higher data rates, the MAX3073E series offers 500kbps operation, while the MAX3076E series supports up to 16Mbps. Verify pin compatibility and thermal performance when substituting with these higher-speed variants.