MAX3222ECTP+T

Overview

The MAX3222ECTP+T is a true 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 typical propagation delays of 0.15µs. It incorporates an internal dual charge pump requiring four 0.1µF capacitors. ESD protection is rated at ±15kV (Human Body Model) and ±8kV (IEC Contact Discharge). The part is housed in a 20-pin TQFN-EP package (5mm x 5mm) and supports an operating temperature range of 0°C to +70°C.

Feature Summary

• Integrated dual charge pump generates required voltage levels from a single low-voltage supply without external transformers.
• Enhanced electrostatic discharge protection on all transmitter outputs and receiver inputs ensures robustness against static events.
• Dedicated shutdown control pin reduces power consumption significantly while maintaining the ability to monitor external signals.

Applications

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

Procurement Notes

Verify the specific suffix 'ECTP' corresponds to the 20-pin TQFN-EP package and the commercial temperature range (0°C to +70°C). Confirm that the '+T' designation indicates tape-and-reel packaging if applicable to your assembly process. Ensure the component source is authorized to guarantee authenticity and traceability.

Selection Notes

Select this component when space constraints require a compact TQFN footprint alongside low-power requirements. It serves as a direct functional replacement for legacy MAX242 devices but offers superior ESD tolerance and lower quiescent current. Verify that the application load capacitance remains within the limits specified for the 250kbps data rate.

Part Context

This device belongs to the MAX3222E/MAX3232E family of RS-232 transceivers. It shares core architecture with the MAX3232E but differs in pinout compatibility with industry-standard parts like the MAX242. The family is characterized by its ability to operate efficiently at low voltages using internal charge pumps.

Replacement Considerations

The MAX3222ECWN+ provides equivalent functionality in a 18-pin Wide SOIC package. For applications requiring extended industrial temperature ranges (-40°C to +85°C), the MAX3222EETP+T is the appropriate alternative within the same TQFN form factor.

FAQ

How does the shutdown mode affect the receiver outputs?

In shutdown mode (SHDN = GND), the transmitters are disabled and enter a high-impedance state. However, the receivers remain active, allowing the monitoring of external signals while consuming minimal supply current.

What is the maximum data rate guaranteed for this device?

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

Does the exposed pad need to be connected?

The datasheet instructs users to solder the exposed pad (EP) to the ground plane or leave it unconnected. Connecting it to the ground plane typically aids in thermal dissipation and electrical grounding.