MAX3040CUE+T

Overview

The MAX3040CUE+T is a quad RS-485/RS-422 transmitter operating from a single +5V supply. It supports data rates up to 250kbps 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, dropping to 2nA in shutdown mode. It is housed in a 16-pin TSSOP package and operates within a commercial temperature range of 0°C to +70°C.

Feature Summary

• Integrated hot-swap inputs ensure driver outputs remain disabled during power-up or board insertion to prevent erroneous data transmission.
• Outputs are protected against electrostatic discharges up to ±10kV (Human Body Model) and withstand ±4kV fast transient bursts.
• Slew-rate limited output drivers reduce electromagnetic interference and signal reflections caused by improperly terminated cables.
• Low-power shutdown mode reduces supply current consumption to 2nA when enabled via control pins.

Applications

• Telecommunications equipment
• Industrial motor control systems
• Hand-held equipment requiring ESD-sensitive transmission
• Industrial PLCs
• Networking applications

Procurement Notes

Verify the component matches the specific commercial temperature grade (0°C to +70°C) and the 16-pin TSSOP package configuration. Confirm that the datasheet revision aligns with the required specifications for your design. Ensure compatibility with standard RS-485/RS-422 receiver pairs such as the MAX3093E or MAX3095 for optimal system performance.

Selection Notes

Select this component for designs requiring robust ESD protection and hot-swap functionality without integrated receivers. It serves as a direct pin-compatible upgrade to industry-standard devices like the SN75174. Choose this part over higher-speed variants if the application requires lower data rates up to 250kbps with minimized EMI through slew-rate limiting.

Part Context

This component belongs to the MAX3040–MAX3045 family of 5V quad transmitters designed for twisted-pair balanced lines. The 'C' suffix indicates the commercial temperature range, while 'UE' specifies the 16-pin TSSOP package. It functions exclusively as a transmitter and must be paired with compatible differential line receivers for complete communication links.

Replacement Considerations

The MAX3040 is pin-compatible with the SN75174, DS26LS31C, and LTC487. Verify that replacement parts maintain the same voltage levels and interface protocols. Ensure any substitute also meets the required ESD protection standards and thermal specifications for the intended environment.

FAQ

How does the hot-swap feature function?

The hot-swap inputs hold the enable pins low during power-up or board insertion, keeping the transmitter outputs in a high-impedance state to prevent false transitions on the data cable.

What is the maximum data rate for the MAX3040?

The MAX3040 supports a maximum data rate of 250kbps. Higher speed variants in the family, such as the MAX3041, support up to 2.5Mbps.

Is the MAX3040 a full transceiver?

No, the MAX3040 is a quad transmitter only. It does not include integrated receivers and must be used with separate differential line receivers like the MAX3093E or MAX3095.