MAX3222ECWN+T

Overview

The MAX3222ECWN+T is a dual RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +3.0V to +5.5V supply and features two drivers and two receivers for full-duplex communication. The device guarantees data rates up to 250kbps with worst-case loads of 3kΩ in parallel with 1000pF. It incorporates an internal dual charge pump requiring only four 0.1μF capacitors. ESD protection is rated at ±15kV (Human Body Model) and ±8kV (IEC Contact Discharge). A shutdown mode reduces supply current to less than 1μA while keeping receivers active. It is housed in an 18-pin Wide SOIC package and supports an operating temperature range of 0°C to +70°C.

Feature Summary

• Integrated dual charge pump enables true RS-232 performance from a single low-voltage supply using minimal external capacitance.
• Enhanced electrostatic discharge protection safeguards transmitter outputs and receiver inputs against high-voltage static events.
• Low-power shutdown mode significantly reduces consumption while maintaining receiver activity for external signal monitoring.

Applications

• Battery-powered portable equipment
• Cell phone and smartphone data cables
• Notebook, subnotebook, and palmtop computers

Procurement Notes

Verify the specific suffix ECWN+T corresponds to the 18-pin Wide SOIC package and the commercial 0°C to +70°C temperature grade. Confirm that the ordering code includes the lead-free/RoHS-compliant designation indicated by the plus sign. Ensure compatibility with the required board-level soldering profiles specified in JEDEC standards.

Selection Notes

Select this component when designing systems requiring full-duplex RS-232 communication with low power consumption. It serves as a direct pin-compatible replacement for industry-standard MAX242 devices. Verify that the application requires the specific 18-pin Wide SOIC footprint and does not necessitate the MegaBaud capabilities found in other family members like the MAX3237E.

Part Context

This part belongs to the MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E family of True RS-232 Transceivers. These devices share common architectural features such as the proprietary low-dropout transmitter output stage and internal voltage converters. The MAX3222E specifically provides the dual driver/receiver configuration optimized for standard serial port implementations.

Replacement Considerations

The MAX3222E is functionally compatible with the industry-standard MAX242. Designers replacing legacy parts should verify that the existing circuit layout accommodates the specific capacitor requirements and pinout of the MAX3222ECWN+T.

FAQ

How does the shutdown mode affect receiver functionality?

In shutdown mode (SHDN = GND), the supply current drops below 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 under worst-case load conditions?

The device guarantees operation at data rates of 250kbps when loaded with 3kΩ in parallel with 1000pF.

Does the MAX3222E support MegaBaud operation?

No, the MAX3222E does not feature MegaBaud operation. This capability is specific to other members of the family, such as the MAX3237E.