MAX3243CWI

Overview

The MAX3243CWI is a multichannel RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 28-pin Wide SO package. It operates from a single +3.0V to +5.5V supply and features three drivers and five receivers with full-duplex communication capability. 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 propagation delays of 0.3µs. The component provides ±15kV ESD protection and includes an always-active complementary receiver output (R2OUTB) for external monitoring during shutdown states.

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 internal ±5.5V supplies from a single low-voltage source, eliminating the need for external ±12V rails.
• 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 ordering suffix against the manufacturer's official documentation to confirm package type and temperature range. Ensure compatibility with system voltage requirements and interface standards before integration. Cross-reference part numbers with authorized distributors to confirm authenticity and availability status.

Selection Notes

Select this component for applications requiring low-power RS-232 connectivity with minimal external capacitance. The 28-pin Wide SO package suits designs needing multiple transmitter and receiver channels. Verify that the operating temperature range meets environmental specifications and that the single-supply architecture aligns with available power rails.

Part Context

This device belongs to the MAX3221/MAX3223/MAX3243 family of low-voltage RS-232 transceivers. While sharing core AutoShutdown and charge-pump technologies, the MAX3243 variant specifically offers three drivers and five receivers. It differs from the MAX3221 and MAX3223 in channel count and package options, providing enhanced I/O flexibility for complex serial interfaces.

Replacement Considerations

MAX3243CAI and MAX3243CUI are alternative package variants within the same electrical specification family. Direct substitution requires verifying pinout compatibility and thermal performance differences between Wide SO, SSOP, and TSSOP footprints.