MAX3223EETP+

Overview

The MAX3223EETP+ is a dual RS-232 transceiver from the MAX3221E/MAX3223E/MAX3243E family, manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +3.0V to +5.5V supply and features an AutoShutdown mode that reduces supply current to 1µA when no valid signal is detected. The device includes two drivers and two receivers, supporting data rates up to 250kbps with worst-case loads of 3kΩ in parallel with 1000pF. It provides ±15kV ESD protection via Human Body Model and IEC 1000-4-2 standards. The component is housed in a 20-pin TQFN-EP package and is rated for operation over an extended 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 and -5.5V supplies using only four small external capacitors.
• Enhanced electrostatic discharge protection ensures robustness against high-voltage static events without latchup.
• INVALID output pin indicates the presence or absence of valid RS-232 signal levels on receiver inputs.

Applications

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

Procurement Notes

Verify the specific ordering suffix EETP+ corresponds to the required 20-pin TQFN-EP package and the -40°C to +85°C industrial temperature grade. Confirm RoHS compliance status and lead-free specifications match project requirements. Ensure the source documentation explicitly identifies the manufacturer as Analog Devices Inc. or Maxim Integrated to validate authenticity.

Selection Notes

Select this component for designs requiring low-power RS-232 communication in space-constrained environments. The 250kbps data rate suits standard serial interfaces where higher speeds are unnecessary. The TQFN-EP package is suitable for applications needing thermal dissipation through the exposed paddle. Verify that the system can tolerate the 100µs wake-up time associated with the AutoShutdown feature.

Part Context

This part belongs to the MAX3221E/MAX3223E/MAX3243E series of true RS-232 transceivers. While the MAX3221E offers one driver/receiver and the MAX3243E provides three drivers and five receivers, the MAX3223E specifically provides two drivers and two receivers. All variants share the same core architecture, including the AutoShutdown feature and ESD protection capabilities.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Cross-referencing requires verifying pinout compatibility, electrical characteristics, and package dimensions against alternative RS-232 transceivers.

FAQ

How does the AutoShutdown feature reduce power consumption?

When FORCEON is low and FORCEOFF is high, the device monitors receiver inputs. If no valid RS-232 signal levels are detected for 30µs, the onboard charge pump and drivers shut off, reducing supply current to 1µA.

What is the function of the INVALID output pin?

The INVALID output goes low when no valid RS-232 signal levels have been detected on all receiver inputs. It goes high when a valid level is present, allowing software to monitor port activity.

What capacitor values are required for 3.3V operation?

For a +3.3V supply, the datasheet specifies using 0.1µF capacitors for C1, C2, C3, and C4.