MAX3241EWI+T

Overview

The MAX3241EWI+T is a true RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 28-pin Wide SOIC package. It operates from a single +3.0V to +5.5V supply and features three drivers and five receivers. The device utilizes a dual charge pump requiring four 0.1µF external capacitors to generate ±5.5V internal supplies. It guarantees data rates up to 120kbps with worst-case loads of 3kΩ parallel 1000pF, while typical operation supports 235kbps. The component includes shutdown functionality reducing supply current to less than 1µA and provides complementary receiver outputs for continuous monitoring.

Feature Summary

• Integrated dual charge pump eliminates the need for bipolar ±12V power supplies
• Complementary receiver outputs remain active during shutdown to enable external device monitoring
• Low-power shutdown mode reduces supply current to under 1µA while maintaining receiver activity
• Proprietary low-dropout transmitter output stage ensures true RS-232 performance at low voltages

Applications

• Battery-powered equipment
• Hand-held devices
• Peripherals
• Datacom equipment

Procurement Notes

Verify the specific suffix 'EWI' corresponds to the Wide SOIC package and industrial temperature range (-40°C to +85°C). Confirm the '+T' designation indicates tape-and-reel packaging if required for automated assembly. Ensure the source documentation explicitly lists this exact part number configuration before finalizing procurement orders.

Selection Notes

Select this component when interfacing TTL/CMOS logic with RS-232 ports requiring multiple receivers and drivers. It is suitable for applications needing mouse driveability and low-voltage operation down to 3.0V. Consider the 28-pin SOIC footprint for board layout constraints. Verify capacitor requirements based on the specific VCC voltage used in the design.

Part Context

This device belongs to the MAX32xx family of low-power RS-232 transceivers designed for single-supply operation. It shares architectural similarities with the MAX3222 and MAX3232 but offers increased I/O capacity with three drivers and five receivers. The family emphasizes space-saving designs by minimizing external passive components while maintaining compatibility with standard PC-to-PC communication protocols.

Replacement Considerations

MAX3241EAI+T (SSOP package)

FAQ

What is the function of the R_OUTB pins on the MAX3241?

The R_OUTB pins are noninverting complementary receiver outputs that remain always active, regardless of the EN or SHDN states. They allow external devices to be monitored without forward biasing protection diodes when VCC is removed.

How does the MAX3241 achieve RS-232 voltage levels from a single supply?

It uses an internal regulated dual charge pump that generates +5.5V and -5.5V supplies from the single +3.0V to +5.5V input, requiring only four small 0.1µF external capacitors.

What is the maximum guaranteed data rate for the MAX3241?

The MAX3241 is guaranteed to run at data rates of 120kbps while maintaining RS-232 output levels with worst-case loads. Typical operation can reach 235kbps.