MAX3070EEPD+

Overview

The MAX3070EEPD+ is a +3.3V, full-duplex RS-485 transceiver featuring one driver and one receiver in a 14-pin PDIP package. It supports data rates up to 250kbps with reduced slew-rate drivers to minimize EMI. The device operates from a single 3.3V supply, drawing 1.5mA typical supply current. It includes ±15kV Human Body Model ESD protection on I/O pins, fail-safe circuitry guaranteeing a logic-high output when inputs are open or shorted, and hot-swap capability to prevent false transitions during power-up.

Feature Summary

• Integrated fail-safe circuitry ensures a logic-high receiver output when inputs are open or shorted.
• Hot-swap input structure prevents false bus transitions during board insertion or power-up.
• Reduced slew-rate drivers minimize electromagnetic interference (EMI) and signal reflections.
• Provides ±15kV Human Body Model electrostatic discharge protection on all I/O pins.

Applications

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

Procurement Notes

Verify the specific suffix 'EPD+' corresponds to the 14-pin Plastic DIP package and the '-E' grade for the -40°C to +85°C operating temperature range. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the ordering part number matches the required full-duplex configuration without additional phase inversion features.

Selection Notes

Select this component for applications requiring robust noise immunity and simplified bus termination due to integrated fail-safe thresholds. The fixed 250kbps maximum data rate suits low-to-medium speed industrial networks. Verify that the 1/8-unit load receiver impedance allows for the required number of nodes on the bus. Consider thermal dissipation limits if operating near the upper temperature boundary.

Part Context

This device belongs to the MAX3070E–MAX3079E family of +3.3V RS-485/RS-422 transceivers manufactured by Analog Devices / Maxim Integrated. While sharing core features like ESD protection and hot-swap capabilities, this specific model is designated for full-duplex communication with a fixed 250kbps data rate limit, distinguishing it from higher-speed or half-duplex variants within the same series.

Replacement Considerations

Direct functional replacements within the same family include other MAX307xE models configured for full-duplex operation, such as the MAX3071E or MAX3073E, provided their respective data rate specifications align with system requirements. Verify pin compatibility and package dimensions before substitution.

FAQ

What is the receiver output state when the A and B inputs are left open?

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

How does the device handle bus disturbances during hot insertion?

The DE and RE inputs feature hot-swap capability, which holds the driver disabled and receiver enabled until VCC stabilizes, eliminating false transitions on the bus.

What is the maximum data rate supported by the MAX3070E?

The MAX3070E supports error-free data transmission up to 250kbps due to its reduced slew-rate driver design.