MAX3243EUI+T

Overview

The MAX3243EUI+T is a 28-pin TSSOP RS-232 transceiver operating from +3.0V to +5.5V with AutoShutdown technology. It features three drivers and five receivers, supporting full-duplex communication at data rates up to 235kbps. The device achieves 1µA supply current in shutdown mode when no valid signal is detected on receiver inputs for 30µs. It includes an always-active complementary receiver output (R2OUTB) for external monitoring during shutdown. Propagation delay is typically 0.3µs, and it provides ±15kV ESD protection on receiver inputs.

Feature Summary

• AutoShutdown functionality reduces power consumption by disabling the onboard power supply and drivers when no valid RS-232 signal is present on receiver inputs for 30µs.
• Integrated dual charge-pump circuitry generates required voltage levels from a single low-voltage supply, eliminating the need for external ±12V sources.
• Complementary R2OUTB receiver remains active during shutdown to monitor external devices without forward-biasing connected logic circuits.

Applications

• Battery-powered equipment requiring extended standby life
• Hand-held portable devices with serial communication interfaces
• Portable diagnostics equipment

Procurement Notes

Verify the specific suffix 'U' corresponds to the 28-pin TSSOP package and the '+T' indicates tape-and-reel packaging. Confirm that the 'E' designation ensures operation within the -40°C to +85°C temperature range. Cross-reference the manufacturer's ordering information to ensure compatibility with current production status and RoHS compliance requirements.

Selection Notes

Select this component when a system requires multiple transmitter and receiver channels within a compact surface-mount footprint. The integrated charge pump simplifies design by removing the need for external voltage regulators or negative supply rails. Ensure the application benefits from the low-power AutoShutdown feature to maximize battery life in portable environments.

Part Context

This part belongs to the MAX3243E family of RS-232 transceivers designed for low-voltage operation. It shares core electrical characteristics with other variants in the series but differs in package type and thermal performance. The TSSOP package offers a smaller outline compared to SSOP alternatives while maintaining similar pin configurations for direct interchangeability in space-constrained designs.

Replacement Considerations

Direct replacements include other MAX3243 variants such as MAX3243EAI+T (SSOP-28) or MAX3243EWI+T (Wide SOIC-28). Verify that substitute packages maintain compatible pinouts and thermal resistance values for the existing PCB layout.