MAX3243EEAI

Overview

The MAX3243EEAI is a complete RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 28-pin SSOP package. It features three drivers and five receivers with full-duplex communication capabilities. The device operates on a single +3.0V to +5.5V supply and supports data rates up to 250kbps. It incorporates an AutoShutdown feature that reduces supply current to 1µA when no valid signal is detected. ESD protection is rated at ±15kV for the Human Body Model and ±15kV via IEC 1000-4-2 Air-Gap Discharge.

Feature Summary

• AutoShutdown technology automatically disables charge pumps and drivers to minimize power consumption during idle states.
• Integrated dual charge pump generates internal voltage rails from a single low-voltage supply without external transformers.
• Includes always-active complementary receiver outputs to monitor peripheral activity while main receivers are disabled.

Applications

• Notebook, subnotebook, and palmtop computers
• Battery-powered handheld equipment and cellular phones
• Serial mouse driveability applications

Procurement Notes

Verify the specific suffix 'E' indicates the extended temperature range of -40°C to +85°C. Confirm the package type matches the required 28-SSOP footprint. Ensure the ordering part number aligns with the manufacturer's current selector guide to avoid obsolete variants.

Selection Notes

Select this component for systems requiring three transmit and five receive channels within a compact form factor. It is suitable for battery-operated devices where minimizing standby current is critical. Verify that the application load capacitance remains within limits to maintain the specified 250kbps data rate.

Part Context

This device belongs to the MAX3221E/MAX3223E/MAX3243E family of true 3V RS-232 transceivers. While sharing core architecture with the MAX3221E (1/1) and MAX3223E (2/2), the MAX3243E provides the highest channel count for complex serial port implementations.

Replacement Considerations

MAX3243CAI

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 device shuts off the charge pump and drivers, reducing supply current to 1µA until a valid signal reactivates it.

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

R2OUTB is an always-active noninverting complementary receiver output. It allows monitoring of external devices, such as Ring Indicator signals, even when the main receivers are in a high-impedance shutdown state.