MAX3243EAI+G1Z

Overview

The MAX3243EAI+G1Z is a full RS-232 transceiver featuring three drivers and five receivers in a 28-pin SSOP package. It operates from a single +3.0V to +5.5V supply, utilizing an internal dual charge pump to generate ±5.5V levels without external negative voltage sources. 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 0.1µF capacitors at 3.3V operation. An always-active complementary receiver output (R2OUTB) allows monitoring of RS-232 activity during shutdown states.

Feature Summary

• AutoShutdown functionality reduces power consumption by disabling the onboard power supply and drivers when valid RS-232 signals are absent.
• Integrated dual charge-pump circuitry eliminates the need for external ±12V supplies, enabling operation from a single low-voltage source.
• Complementary R2OUTB receiver remains active during shutdown to monitor external devices without forward-biasing connected logic.

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 manufacturer documentation to confirm package type and temperature range. Confirm RoHS compliance status through official datasheets or component markings. Ensure the supplier provides traceable origin documents matching the Analog Devices/Maxim Integrated part number structure.

Selection Notes

Select this component for applications requiring low-power standby modes and single-supply RS-232 connectivity. Verify that the required number of drivers and receivers matches the system interface needs. Ensure the operating temperature range aligns with the environmental conditions of the target application.

Part Context

This component belongs to the MAX3221/MAX3223/MAX3243 family of +3V to +5.5V RS-232 transceivers. It shares the AutoShutdown feature and internal charge pump architecture with the MAX3221 and MAX3223 variants, differing primarily in the number of integrated drivers and receivers.

Replacement Considerations

Public confirmed substitute part numbers: MAX3243CAI, MAX3243EWI, MAX3243CUI, MAX3243EAI, MAX3243EUI.

FAQ

How does the AutoShutdown feature determine when to enter low-power mode?

The device enters AutoShutdown mode when no valid signal levels are sensed on all receiver inputs for a duration of 30µs, shutting down the power supply and drivers to achieve 1µA supply current.

What is the function of the R2OUTB pin on the MAX3243?

R2OUTB is a complementary, always-active receiver output that monitors RS-232 activity even when the main receivers are in a high-impedance state due to shutdown.

Can the MAX3243 drive serial mice directly?

Yes, the MAX3243 is specifically designed to drive serial mice from low-voltage supplies, meeting their current and voltage requirements while maintaining transmitter output voltages.