MAX3223EETP+T

Overview

The MAX3223EETP+T is a true RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It features two drivers and two receivers, supporting full-duplex communication at data rates up to 250kbps. The device operates from a single +3.0V to +5.5V supply and incorporates an AutoShutdown feature that reduces the typical supply current to 1µA when no valid signal is detected. It includes enhanced ESD protection rated at ±15kV (Human Body Model) and ±8kV (IEC 1000-4-2 Contact Discharge). The component is housed in a 20-pin TQFN package with an exposed paddle and is specified for operation over a temperature range of -40°C to +85°C.

Feature Summary

• AutoShutdown technology automatically disables charge pumps and drivers to minimize power consumption during idle periods.
• Integrated dual charge pump generates internal ±5.5V rails using only four small external capacitors.
• Robust I/O protection withstands high-voltage electrostatic discharge events without latch-up.

Applications

• Notebook, subnotebook, and palmtop computers
• Battery-powered handheld equipment and cellular phones
• Peripherals such as printers and modems

Procurement Notes

Verify the complete part number including the suffix '+T' to confirm tape-and-reel packaging and lead-free compliance. Ensure the ordering code matches the specific manufacturer designation to avoid confusion with non-compliant or obsolete variants. Cross-reference the datasheet revision to confirm pinout consistency before finalizing procurement orders.

Selection Notes

Select this component for applications requiring low-power standby modes in battery-operated systems. The 20-pin TQFN package is suitable for space-constrained designs. Verify that the system voltage falls within the +3.0V to +5.5V range and that the required data rate does not exceed 250kbps for guaranteed RS-232 output levels.

Part Context

This device belongs to the MAX3221E/MAX3223E/MAX3243E family of 3V-powered RS-232 transceivers. While the MAX3221E offers one driver/receiver and the MAX3243E provides three drivers and five receivers, the MAX3223E specifically provides a balanced two-driver/two-receiver configuration for standard serial port implementations.

Replacement Considerations

Publicly confirmed substitutes include the MAX3223EEUP+T (TSSOP package) and the MAX3223ECAP+ (SSOP package). These parts share identical electrical characteristics and functionality but differ in physical package dimensions and pin configurations.

FAQ

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

The device enters AutoShutdown mode when all receiver inputs remain between +0.3V and -0.3V for at least 30µs, indicating that the cable is disconnected or peripherals are off.

What is the function of the INVALID output pin?

The INVALID output goes low when no valid RS-232 signal levels are detected on any receiver input, serving as an indicator for the AutoShutdown logic or software-controlled shutdown.

Can the MAX3223EETP+T drive serial mice directly?

No, the MAX3223EETP+T lacks the specific 'AutoShutdown Plus' feature required for mouse driveability; the MAX3243E or MAX3244E/MAX3245E are recommended for that application.