MAX3044CSE+T

Overview

The MAX3044CSE+T 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 and ±4kV IEC 1000-4-4 Electrical Fast Transient immunity. It includes hot-swap capability to prevent false transitions during power-up or insertion. Operating current is 1mA, with a shutdown mode consuming 2nA. It is housed in a 16-pin Narrow SO package.

Feature Summary

• Hot-swap capability prevents erroneous data transfer during board insertion or power-up sequences.
• Slew-rate limited outputs reduce electromagnetic interference and signal reflections on improperly terminated cables.
• Robust transient immunity withstands ±10kV electrostatic discharge and ±4kV electrical fast transients.

Applications

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

Procurement Notes

Verify the component matches the specific 'C' temperature range (0°C to +70°C) and 'E' suffix indicating the Narrow SOIC-16 package configuration. Confirm the '+T' designation aligns with reel packaging requirements. Ensure the source documentation explicitly identifies this part as a transmitter-only device rather than a full transceiver.

Selection Notes

Select this component when designing systems requiring four independent differential drivers for RS-485 or RS-422 networks. It serves as a direct pin-compatible replacement for legacy SN75174 and DS26LS31C devices. Choose this variant over higher-speed models if system constraints require controlled slew rates to mitigate high-frequency noise.

Part Context

This device belongs to the MAX3040–MAX3045 family of low-power, 5V quad transmitters. While other members like the MAX3042B support 20Mbps, the MAX3044 is specifically optimized for 2.5Mbps operation. It complements receiver ICs such as the MAX3093E and MAX3095 to form complete communication interfaces.

Replacement Considerations

The datasheet confirms pin compatibility with industry-standard parts including the SN75174, DS26LS31C, and LTC487. These components can be substituted directly without circuit redesign, provided their speed and voltage specifications meet the application requirements.

FAQ

How does the MAX3044 handle hot-swap events?

It utilizes internal circuitry to hold enable inputs low during power ramp-up, preventing false transitions on the data cable caused by leakage currents or parasitic capacitance.

What is the purpose of the slew-rate limitation?

The slew-rate limiting minimizes electromagnetic interference (EMI) and reduces signal reflections that occur due to improperly terminated transmission lines.

Does the MAX3044 include receivers?

No, the MAX3044 is a transmitter-only device. It must be paired with compatible quad differential line receivers, such as the MAX3093E or MAX3095.