MAX3243EUI+

Overview

The MAX3243EUI+ is a multichannel RS-232 line driver/receiver manufactured by Analog Devices Inc. (Maxim Integrated). It features three transmitters and five receivers in a 28-pin TSSOP package, operating from a single +3.0V to +5.5V supply. The device incorporates AutoShutdown technology, reducing supply current to 1µA when no valid signal is detected on receiver inputs for 30µs. It supports data rates up to 235kbps with typical operation at 120kbps under worst-case loads. The integrated dual charge pump eliminates the need for external ±12V supplies, requiring only 0.1µF capacitors for 3.3V operation.

Feature Summary

• AutoShutdown feature reduces power consumption by shutting down internal power supplies and drivers when no valid RS-232 signal is present.
• Integrated dual charge-pump voltage converter generates required RS-232 levels from a single low-voltage supply without external high-voltage components.
• Includes an always-active complementary receiver output (R2OUTB) for monitoring external devices while other receivers are in a high-impedance shutdown state.

Applications

• Battery-powered equipment
• Hand-held equipment
• Portable diagnostics equipment

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm package type and temperature range. Ensure compatibility with system power management requirements, particularly regarding the FORCEOFF and FORCEON control logic for AutoShutdown functionality. Confirm that the component meets all necessary environmental and regulatory standards for the intended deployment environment.

Selection Notes

Select this component for applications requiring low-power standby modes and single-supply operation. The MAX3243 variant provides additional transmitter and receiver channels compared to the MAX3221 or MAX3223. Consider the 28-pin TSSOP package constraints and ensure adequate decoupling capacitors are placed close to the IC pins to maintain signal integrity and stable charge-pump operation.

Part Context

This part belongs to the MAX3221/MAX3223/MAX3243 family of +3V to +5.5V RS-232 transceivers. The 'E' designation indicates an extended temperature range of -40°C to +85°C. The 'U' suffix specifies the 28-lead Thin Shrink Small Outline Package (TSSOP). The '+' suffix denotes compliance with RoHS standards.

Replacement Considerations

Direct pin-compatible replacements within the same family include the MAX3243CAI+ (industrial temperature range) and MAX3243EWI+ (wide SOIC package). For systems requiring fewer channels, the MAX3223 series offers similar functionality with two drivers and two receivers.