MAX3241ECUI+

Overview

The MAX3241ECUI+ is a true RS-232 transceiver manufactured by Analog Devices / Maxim Integrated, housed in a 28-pin TSSOP package. It operates on a single +3.0V to +5.5V supply and features three drivers and five receivers for full-duplex communication. The device guarantees data rates up to 250kbps with typical propagation delays of 0.15µs. It incorporates an internal dual charge pump requiring only four 0.1µF external capacitors. Supply current is typically 1mA, dropping to less than 1µA in shutdown mode. ESD protection ratings include ±15kV (Human Body Model) and ±8kV (IEC Contact Discharge).

Feature Summary

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

Applications

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

Procurement Notes

Verify the specific suffix 'ECUI+' corresponds to the required temperature range and lead-free compliance status. Confirm the 28-pin TSSOP package dimensions match the target PCB footprint. Ensure the ordering information aligns with the manufacturer's current production status and regional availability constraints.

Selection Notes

Select this component when a serial interface requires multiple transmit and receive channels within a compact form factor. The low operating voltage range makes it suitable for battery-operated systems where power efficiency is critical. Verify that the load capacitance requirements remain within the specified limits for the desired data rate.

Part Context

This part belongs to the MAX32xxE family of low-power RS-232 transceivers designed for space-constrained applications. It shares functional similarities with industry-standard devices like the MAX232 but offers improved power management and higher ESD tolerance levels suitable for modern portable electronics.

Replacement Considerations

The MAX3241EWI serves as a pin-compatible alternative in a different package format. Cross-reference electrical specifications and thermal characteristics before substitution to ensure system compatibility.

FAQ

How does the shutdown mode affect receiver operation?

In shutdown mode, the transmitters are disabled, but the receivers can remain active to monitor external signals while consuming minimal supply current.

What is the purpose of the R_OUTB pins?

The complementary receiver outputs (R_OUTB) are always active, allowing detection of RS-232 activity even when the main receiver outputs are tri-stated or the device is powered down.