MAX3223ECTP+

Overview

The MAX3223ECTP+ is a lead-free, RoHS-compliant RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It features two drivers and two receivers with full-duplex communication capabilities. The device operates on a single +3.0V to +5.5V supply and achieves a typical supply current of 1µA in shutdown mode via the AutoShutdown feature. It supports data rates up to 250kbps and includes ±15kV ESD protection. The component is housed in a 20-pin TQFN-EP package and functions within an operating temperature range of 0°C to +70°C.

Feature Summary

• AutoShutdown technology reduces supply current to 1µA when no valid RS-232 signal levels are detected for 30µs.
• Integrated dual charge pump generates internal +5.5V and -5.5V supplies from a single low-voltage source.
• Enhanced electrostatic discharge protection withstands ±15kV human body model and ±8kV IEC contact discharge.
• Proprietary low-dropout transmitter output stage ensures true RS-232 performance at high data rates.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'ECTP+' against official manufacturer documentation to confirm the 20-pin TQFN-EP package and 0°C to +70°C industrial temperature range. Ensure that the lead(Pb)-free/RoHS-compliant status matches project requirements. Cross-reference the datasheet revision history to validate pin configurations and electrical characteristics prior to final procurement.

Selection Notes

Select this component for applications requiring minimal power consumption during idle states without BIOS modifications. The integrated charge pump eliminates the need for external voltage generation circuits. Verify that the required data rate does not exceed 250kbps under worst-case load conditions. Confirm that the physical footprint constraints align with the space-saving TQFN package dimensions.

Part Context

This part belongs to the MAX3221E/MAX3223E/MAX3243E family of 3V-powered RS-232 transceivers. While the MAX3221E contains one driver/receiver pair and the MAX3243E provides three drivers and five receivers, the MAX3223E specifically offers two drivers and two receivers. All variants share identical core technologies, including AutoShutdown and ESD protection mechanisms.

Replacement Considerations

Publicly confirmed substitute part numbers include MAX3223EEAP+, MAX3223EEUP+, and MAX3223EETP+. These alternatives maintain functional compatibility but differ in package type or operating temperature range specifications.

FAQ

How does the AutoShutdown feature reduce power consumption?

The AutoShutdown circuitry monitors receiver inputs. If no valid RS-232 signal levels are detected for 30µs, the onboard charge pump and drivers shut off, reducing the supply current to 1µA. The device automatically reactivates upon detecting a valid signal level.

What is the function of the INVALID output pin?

The INVALID output indicates the presence of valid RS-232 signals. It is enabled low when no valid RS-232 signal levels have been detected on all receiver inputs, serving as a status indicator for the AutoShutdown logic.

Can the MAX3223ECTP+ drive serial mice directly?

No, the MAX3223ECTP+ only contains two drivers. The MAX3243E variant is specifically designed to drive serial mice due to its three-driver configuration and regulated dual charge pump ensuring sufficient current under worst-case conditions.