MAX3222ECAP+T

Overview

The MAX3222ECAP+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 specific configurations supporting up to 1Mbps. 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 1μA while keeping receivers active. It is housed in a 20-pin SSOP package.

Feature Summary

• Integrated dual charge pump enables operation from a single low-voltage supply without external voltage inversion components.
• Enhanced electrostatic discharge protection ensures robustness against high-voltage static events on all I/O pins.
• Low-power shutdown mode significantly reduces energy consumption while maintaining receiver monitoring capability.

Applications

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

Procurement Notes

Verify the component authenticity through official manufacturer channels or authorized distributors. Confirm that the ordering suffix matches the required temperature range and packaging specifications. Ensure compliance with RoHS directives as indicated by the plus sign in the part number. Cross-reference the datasheet revision to confirm pinout and electrical characteristics match your design requirements.

Selection Notes

Select this component when designing systems requiring low-voltage RS-232 interfaces with minimal external capacitance. It is suitable for applications where power efficiency is critical due to the available shutdown mode. Consider the 20-pin SSOP package constraints regarding board space and thermal dissipation. Verify that the 250kbps standard rate meets the system's baud rate requirements.

Part Context

This device belongs to the MAX3222E/MAX3232E family of RS-232 transceivers designed for low-power applications. It is functionally compatible with industry-standard parts like the MAX242 but optimized for lower voltage operation. The family shares common architectural features such as the internal charge pump and ESD protection structures.

Replacement Considerations

MAX3222ECPN+ offers identical functionality in a PDIP-18 package. MAX3222ECUP+ provides the same performance in a TSSOP-20 package. These alternatives maintain pin compatibility and electrical specifications while differing only in physical footprint.

FAQ

What is the typical supply current in shutdown mode?

The supply current drops 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 sufficient for operation from a +3.3V supply.

Does the device support MegaBaud operation?

No, the MAX3222E does not feature MegaBaud control; it is limited to 250kbps. This feature is available in the MAX3237E variant.