MAX3070EAPD+

Overview

The MAX3070EAPD+ is a +3.3V, ±15kV ESD-protected, fail-safe, hot-swap RS-485 transceiver featuring one driver and one receiver. It operates within an extended temperature range of -40°C to +125°C and supports data rates up to 250kbps with reduced slew-rate drivers. The device draws 800μA supply current when unloaded or fully loaded with drivers disabled, and enters a shutdown mode consuming only 10μA. It provides ±15kV Human Body Model ESD protection on I/O pins and includes enhanced slew-rate limiting for error-free transmission.

Feature Summary

• Integrated fail-safe circuitry guarantees a logic-high receiver output when inputs are open or shorted while maintaining EIA/TIA-485 compatibility.
• Hot-swap input structure on DE and RE pins eliminates false transitions during power-up or hot insertion into active backplanes.
• Enhanced slew-rate-limiting minimizes electromagnetic interference (EMI) and reduces reflections caused by improperly terminated cables.

Applications

• Lighting Systems
• Industrial Control
• Telecom
• Security Systems
• Instrumentation

Procurement Notes

Verify the specific suffix 'APD+' against official Analog Devices documentation to confirm package type and temperature grade. Ensure the component matches the required RS-485 protocol specifications and voltage levels before integration. Cross-reference the manufacturer part number with authorized distributors to confirm authenticity and availability status.

Selection Notes

Select this component for applications requiring robust ESD protection and fail-safe operation in noisy industrial environments. The reduced slew rate limits signal integrity issues on long or poorly terminated buses. Verify that the 250kbps maximum data rate meets system requirements and that the 8-pin DIP package fits the board layout constraints.

Part Context

This device belongs to the MAX3070E–MAX3079E family of high-speed RS-485/RS-422 transceivers manufactured by Analog Devices (formerly Maxim Integrated). The family shares common features like ±15kV ESD protection and hot-swap capability but varies in duplex mode, data rate capabilities, and pin configurations across different model numbers.

Replacement Considerations

Direct replacements within the same family include MAX3070E, MAX3071E, and MAX3072E, which share identical electrical characteristics and pinouts. Other models like MAX3073E or MAX3076E offer higher data rates but may require verification of slew-rate settings and package compatibility.

FAQ

What is the fail-safe threshold voltage for the receiver?

The receiver guarantees a logic-high output if the differential input voltage (A-B) is greater than or equal to -50mV, and a logic-low if it is less than or equal to -200mV.

How does the hot-swap feature protect the bus?

Internal pulldown and pullup circuits hold the DE and RE inputs in safe states during power-up, preventing erroneous data transfer when inserting boards into powered backplanes.

What is the supply current in shutdown mode?

The device draws a typical shutdown current of 10µA when both RE is high and DE is low.