MAX3243CAI+T

Overview

The MAX3243CAI+T is a true RS-232 transceiver manufactured by Analog Devices/Maxim Integrated, housed in a 28-pin SSOP package. It features three drivers and five receivers with full-duplex communication capability. The device operates from a single +3.0V to +5.5V supply and achieves a typical supply current of 1µA via the AutoShutdown feature when no valid signal is detected on receiver inputs for 30µs. It supports data rates up to 235kbps with a maximum guaranteed rate of 120kbps under worst-case loads. The component includes an always-active complementary receiver output (R2OUTB) for external monitoring during shutdown.

Feature Summary

• AutoShutdown technology reduces power consumption by disabling internal charge pumps and drivers when no valid RS-232 signal is present on receiver inputs.
• 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 creating current paths through connected logic.

Applications

• Battery-powered equipment requiring extended standby life
• Hand-held portable devices
• Portable diagnostics equipment

Procurement Notes

Verify that the ordering suffix 'T' corresponds to tape-and-reel packaging as specified in official documentation. Confirm the 'C' designation indicates the commercial temperature range of 0°C to +70°C. Ensure the '+'' suffix aligns with RoHS compliance requirements for the specific manufacturing batch.

Selection Notes

Select this component when a single-supply RS-232 interface with minimal quiescent current is required. The MAX3243 variant provides three drivers and five receivers, suitable for complex peripheral connections. Verify that the 28-pin SSOP footprint matches the target PCB layout constraints.

Part Context

This part belongs to the MAX3221/MAX3223/MAX3243 family of 3V to 5.5V RS-232 transceivers. While sharing core AutoShutdown functionality, the MAX3243 distinguishes itself with additional transmitter and receiver channels compared to the MAX3221 and MAX3223 variants.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.