MAX3222ECTP+

Overview

The MAX3222ECTP+ is a true RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 20-pin TQFN-EP package (5mm x 5mm). It operates within a supply voltage range of +3.0V to +5.5V and supports data rates up to 250kbps under standard conditions. The device integrates two drivers and two receivers with full-duplex communication capability. It features an ultra-low shutdown mode consuming as little as 1μA while keeping receivers active for external monitoring. Enhanced ESD protection safeguards all transmitter outputs and receiver inputs against ±15kV Human Body Model discharges and ±8kV IEC 1000-4-2 contact discharges.

Feature Summary

• Integrated dual charge pump generates internal +5.5V and -5.5V supplies from a single low-voltage source using only four small capacitors.
• Ultra-low power consumption achieved through a shutdown mode that reduces supply current to 1μA while maintaining receiver activity.
• Robust electrostatic discharge protection on all logic and RS-232 I/O pins ensures reliability during handling and assembly.
• Pin, package, and functionally compatible with industry-standard MAX232 devices for simplified design upgrades.

Applications

• Battery-powered portable equipment requiring extended operational life
• Cell phones and smart phones utilizing serial communication interfaces
• Notebook, subnotebook, and palmtop computers
• Printers and peripheral devices connected via serial cables

Procurement Notes

Verify the specific ordering suffix 'ECTP+' confirms the lead-free/RoHS-compliant status and the 20-pin TQFN-EP package configuration. Confirm the temperature grade corresponds to the commercial range of 0°C to +70°C. Ensure compatibility with the required PCB footprint for the exposed pad thermal connection.

Selection Notes

Select this component when space constraints favor a compact TQFN package over traditional SSOP or SO packages. Choose this part if the application requires an ultra-low standby current of 1μA to preserve battery life in portable systems. Verify that the 250kbps data rate meets the system requirements, as higher speeds are not supported in the standard operating mode.

Part Context

This device belongs to the MAX3222E/MAX3232E family of +3.0V-powered RS-232 transceivers. It serves as a direct replacement for legacy MAX232-based designs while offering improved power efficiency and enhanced ESD robustness. The family includes variants with different pin counts and package styles to accommodate diverse form factors.

Replacement Considerations

The MAX3222ECTP+ is functionally compatible with the MAX232. For direct pin-for-pin replacement in existing designs, verify that the original circuit utilizes the standard capacitor values specified for the MAX232, which are generally compatible with the MAX3222E's charge pump requirements.

FAQ

How does the shutdown mode affect receiver functionality?

In shutdown mode (SHDN = GND), the supply current drops to 1μA. However, the receivers remain active, allowing the device to monitor external signals even while the transmitters are disabled.

What is the maximum data rate guaranteed for this device?

The MAX3222E guarantees operation at data rates up to 250kbps while maintaining RS-232 output levels under worst-case load conditions.

Does the device require external voltage regulators?

No, the MAX3222E utilizes an internal dual charge pump to generate the necessary +5.5V and -5.5V supplies from the +3.0V to +5.5V VCC input, eliminating the need for external regulators.