MAX3243EEAI+G071

Overview

The MAX3243EEAI+ is a true RS-232 transceiver from the MAX3243E series, manufactured by Analog Devices / Maxim Integrated. It features three drivers and five receivers in a 28-pin SSOP package. The device operates on a single +3.0V to +5.5V supply with a typical operating current of 1mA and achieves a maximum data rate of 250kbps. It incorporates AutoShutdown technology to reduce supply current to 1µA when no valid signal is detected. ESD protection is rated at ±15kV (HBM) and ±8kV (IEC Contact Discharge). The component supports full-duplex communication and includes an INVALID output for signal detection.

Feature Summary

• AutoShutdown feature reduces supply current to 1µA upon cable disconnection or peripheral power-off
• Integrated dual charge pump generates required voltage levels without external transformers
• Enhanced I/O protection withstands ±15kV air-gap and ±8kV contact discharge events
• Always-active complementary receiver outputs allow monitoring of powered-down peripherals

Applications

• Notebook, subnotebook, and palmtop computers
• Battery-powered equipment and handheld devices
• Cellular phones and peripherals

Procurement Notes

Verify the specific suffix 'G071' against official manufacturer documentation, as standard datasheets typically list 'MAX3243EEAI+'. Confirm that this suffix does not alter the electrical characteristics or pinout compared to the standard industrial temperature grade part. Ensure compatibility with the 28-pin SSOP footprint during procurement planning.

Selection Notes

Select this component for applications requiring low-power standby modes via AutoShutdown. It is suitable for systems needing three transmit and five receive channels within a compact SSOP package. Verify that the 250kbps data rate meets system requirements and that the +3.0V to +5.5V supply range aligns with the design's power architecture.

Part Context

This device belongs to the MAX3221E/MAX3223E/MAX3243E family of low-voltage RS-232 transceivers. While the MAX3221E offers one driver/receiver and the MAX3223E provides two pairs, the MAX3243E delivers a complete serial port solution with three drivers and five receivers, making it ideal for complex notebook interfaces.

Replacement Considerations

Public confirmed substitute part numbers include MAX3243CAI+ and MAX3243EEAI+T.

FAQ

How does the AutoShutdown feature function?

The AutoShutdown circuitry monitors receiver inputs; if no valid RS-232 signal levels are detected for 30µs, the charge pumps and drivers shut off, reducing supply current to 1µA.

What is the purpose of the R2OUTB pin on the MAX3243E?

R2OUTB is an always-active noninverting complementary receiver output that allows external devices to be monitored without forward biasing protection diodes in powered-down circuitry.

Does the MAX3243E support mouse driveability?

Yes, the MAX3243E is specifically designed to drive serial mice, meeting their current and voltage requirements even under worst-case load conditions.