MAX3241EEUI+T

Overview

The MAX3241EEUI+T is a true RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +3.0V to +5.5V supply and features three drivers and five receivers. The device guarantees data rates up to 250kbps with worst-case loads of 3kΩ in parallel with 1000pF, while maintaining full RS-232 output levels. It incorporates an internal dual charge pump requiring only four 0.1μF external capacitors. ESD protection is rated at ±15kV (Human Body Model) and ±8kV (IEC 1000-4-2 Contact Discharge). The EE suffix indicates an extended temperature range of -40°C to +85°C, and the part is housed in a 28-pin TSSOP package.

Feature Summary

• Integrated dual charge pump enables true RS-232 performance from a single low-voltage supply using minimal external capacitance.
• Enhanced electrostatic discharge protection safeguards transmitter outputs and receiver inputs against high-voltage static events.
• Shutdown mode significantly reduces power consumption while allowing receiver monitoring through complementary outputs.

Applications

• Notebook and subnotebook computers
• Battery-powered portable equipment
• Cell-phone data cables

Procurement Notes

Verify the specific ordering suffix EEUI+T to confirm the 28-pin TSSOP package, extended industrial temperature range (-40°C to +85°C), and lead-free/RoHS compliance status. Cross-reference the manufacturer's official documentation for current production status and availability constraints before finalizing procurement plans.

Selection Notes

Select this component when designing serial communication interfaces for space-constrained mobile devices requiring low power consumption. Ensure the application supports the required four 0.1μF external capacitors for the charge pump. Verify that the system voltage remains within the +3.0V to +5.5V operating range to maintain guaranteed RS-232 signal integrity.

Part Context

This device belongs to the MAX32xxE family of low-power RS-232 transceivers. It shares architectural similarities with the MAX3222E and MAX3232E but provides a higher channel count suitable for complex peripheral connections. The MAX3241E variant specifically addresses the needs of notebook systems requiring multiple serial ports.

Replacement Considerations

MAX3241EUI+T

FAQ

How does the shutdown mode affect the receiver outputs?

In shutdown mode, the standard receiver outputs (R_OUT) enter a high-impedance state if the EN pin is high. However, the complementary receiver outputs (R_OUTB) remain active regardless of the EN or SHDN states, allowing for ring indicator detection even when the main logic is powered down.

What are the ESD protection ratings for the MAX3241E?

The transmitter outputs and receiver inputs are protected to ±15kV using the Human Body Model, ±15kV via IEC 1000-4-2 Air-Gap Discharge, and ±8kV via IEC 1000-4-2 Contact Discharge.

What is the maximum data rate guaranteed under standard conditions?

The device guarantees operation at data rates of 250kbps while maintaining RS-232 output levels with worst-case loads of 3kΩ in parallel with 1000pF.