MAX3040EUE+

Overview

The MAX3040EUE+ is a quad RS-485/RS-422 transmitter manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +5V supply with a typical operating current of 1mA and consumes 2nA in shutdown mode. The device supports data rates up to 250kbps and features ±10kV ESD protection (Human Body Model) and ±4kV Electrical Fast Transient immunity per IEC 1000-4-4. It includes hot-swap capability to prevent false transitions during power-up or insertion. The component is housed in a 16-pin TSSOP package and functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Hot-swap capability prevents erroneous data transfer during board insertion or power-up sequences.
• Slew-rate limiting minimizes electromagnetic interference and reduces signal reflections on improperly terminated cables.
• Robust protection against electrostatic discharge and electrical fast transients ensures reliability in harsh environments.

Applications

• Telecommunications equipment
• Industrial motor control systems
• Transmitter applications requiring ESD sensitivity
• Hand-held equipment
• Industrial PLCs

Procurement Notes

Verify the specific ordering suffix 'EUE+' corresponds to the required extended temperature range (-40°C to +85°C) and the 16-pin TSSOP package configuration. Confirm that the datasheet revision matches the design requirements, as specifications may evolve. Ensure compatibility with existing PCB footprints for the selected package type before finalizing procurement decisions.

Selection Notes

Select this component when designing systems requiring quad differential drivers for RS-485 or RS-422 networks at data rates up to 250kbps. It serves as a low-power, ESD-protected upgrade to industry-standard parts like the SN75174. Consider pairing with compatible receivers such as the MAX3093E or MAX3095 for optimal system performance.

Part Context

This part belongs to the MAX3040–MAX3045 family of 5V quad RS-485/RS-422 transmitters. While other members of the series support higher data rates up to 20Mbps, the MAX3040 variant is specifically optimized for lower-speed applications up to 250kbps. The family shares pinout compatibility across different packages and speed grades.

Replacement Considerations

Public confirmed substitutes include the MAX3040CUE+, MAX3040ESE+, and MAX3040EWE+. These variants offer identical functionality but differ in temperature range or package style. Verify pin compatibility with legacy standards like SN75174 if replacing older designs.

FAQ

How does the hot-swap feature function?

The hot-swap inputs hold the enable pins in a disabled state during power-up or board insertion, preventing false transitions on the data cable caused by leakage currents or parasitic capacitance.

What is the maximum data rate for the MAX3040EUE+?

The MAX3040EUE+ supports a maximum data rate of 250kbps, utilizing slew-rate limiting to minimize EMI and reflections.

Is the MAX3040EUE+ compatible with standard RS-485 receivers?

Yes, it offers optimum performance when used with 5V quad differential line receivers like the MAX3093E/MAX3095 or 3V receivers like the MAX3094E/MAX3096.