MAX3044EUE+

Overview

The MAX3044EUE+ is a quad RS-485/RS-422 transmitter operating from a single +5V supply. It supports data rates up to 2.5Mbps with slew-rate limiting to minimize EMI and reflections. The device features ±10kV Human Body Model ESD protection on all outputs and withstands ±4kV Electrical Fast Transient/Burst stress per IEC 1000-4-4. It includes hot-swap capability to prevent false transitions during power-up or insertion. Operating current is 1mA, with a low-power shutdown mode consuming 2nA. It operates within a temperature range of -40°C to +85°C in a 16-pin TSSOP package.

Feature Summary

• Hot-swap inputs eliminate false data transitions during board insertion or power-up sequences.
• Slew-rate limited outputs reduce electromagnetic interference and signal reflections on improperly terminated cables.
• Robust output protection handles ±10kV electrostatic discharge and ±4kV electrical fast transient bursts.

Applications

• Telecommunications equipment
• Industrial motor control systems
• Transmitter for ESD-sensitive applications
• Hand-held equipment
• Industrial PLCs

Procurement Notes

Verify the specific suffix 'EUE+' corresponds to the extended temperature range (-40°C to +85°C) and the 16-pin TSSOP package configuration. Confirm that the component meets RoHS compliance standards required for your assembly process. Ensure the ordering documentation matches the exact manufacturer part number to avoid pinout mismatches with legacy drivers.

Selection Notes

Select this component when designing RS-485 or RS-422 networks requiring high-speed transmission up to 2.5Mbps. It serves as a direct pin-compatible upgrade for industry-standard devices like the SN75174 and DS26LS31C. Use this driver in conjunction with compatible quad receivers such as the MAX3093E or MAX3095 for optimal system performance.

Part Context

This device belongs to the MAX3040–MAX3045 family of 5V quad transmitters designed for twisted-pair balanced lines. The MAX3044 specifically targets the 2.5Mbps data rate segment, offering a balance between speed and noise reduction through slew-rate limiting. It provides a modern, low-power alternative to older discrete logic solutions.

Replacement Considerations

Pin-compatible replacements include the MAX3041 (same speed, different enable logic), MAX3040/MAX3043 (250kbps), and MAX3042B/MAX3045B (20Mbps). Legacy equivalents include the SN75174 and DS26LS31C, though these lack the integrated ESD protection and hot-swap features found in the MAX3044.

FAQ

How does the hot-swap feature function?

The hot-swap inputs hold the transmitter enable pins in a disabled state during power-up or board insertion. This prevents leakage currents or parasitic capacitance from causing erroneous data transitions on the bus before the processor is fully initialized.

What is the purpose of slew-rate limiting?

Slew-rate limiting reduces the speed of signal transitions to minimize electromagnetic interference (EMI) and decrease signal reflections caused by improperly terminated cables, ensuring error-free transmission at 2.5Mbps.

Which receivers are recommended for use with this transmitter?

Optimum performance is achieved when paired with the MAX3093E or MAX3095 5V quad differential line receivers, or the MAX3094E/MAX3096 3V quad differential line receivers.