MAX3222ECAP+

Overview

The MAX3222ECAP+T is a dual RS-232 transceiver manufactured by Analog Devices (Maxim Integrated). It operates from a single +3.0V to +5.5V supply and features an internal dual charge pump requiring four 0.1μF capacitors. The device provides two drivers and two receivers with full-duplex communication capability. It guarantees data rates up to 250kbps, with specific configurations supporting up to 1Mbps under defined load conditions. Supply current is typically 1mA in normal operation and drops to 1μA in shutdown mode. The component includes ±15kV ESD protection on I/O pins and is housed in a 20-pin SSOP package.

Feature Summary

• Integrated dual charge pump generates required voltage levels for true RS-232 signaling without external transformers.
• Enhanced electrostatic discharge protection rated at ±15kV Human Body Model and ±8kV IEC Contact Discharge.
• Low-power shutdown mode reduces supply current to 1μA while keeping receiver inputs active for external monitoring.

Applications

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

Procurement Notes

Verify the exact ordering suffix against official manufacturer documentation to confirm package type and temperature range. Ensure the component source is authorized to prevent counterfeit parts. Confirm RoHS compliance status matches project requirements before finalizing procurement orders.

Selection Notes

Select this component when interfacing TTL/CMOS logic with RS-232 standards using a single low-voltage power supply. The integrated charge pump eliminates the need for external negative voltage generation. Verify that the required data rate does not exceed the guaranteed limits for the specific load capacitance and supply voltage conditions.

Part Context

This part belongs to the MAX3222E/MAX3232E family of low-power RS-232 transceivers. It serves as a direct pin-compatible replacement for industry-standard MAX242 devices. The family shares common architecture including internal charge pumps and enhanced ESD protection structures designed for portable applications.

Replacement Considerations

The MAX3222E is functionally compatible with the MAX242. Verify pinout alignment and electrical specifications before substitution. Check if the original design requires specific shutdown behavior or ESD ratings that differ between legacy and newer generations.

FAQ

What is the typical supply current in shutdown mode?

The supply current falls to less than 1μA when the SHDN pin is driven low.

How many external capacitors are required for the charge pump?

Four small 0.1μF capacitors are required for operation from a +3.3V supply.

Does the device support MegaBaud operation?

No, MegaBaud operation (1Mbps) is a feature specific to the MAX3237E within this family.