MAX3222ECPN+

Overview

The MAX3222ECPN+ is a true RS-232 transceiver manufactured by Analog Devices (Maxim Integrated) in an 18-pin Plastic DIP package. 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 a proprietary low-dropout transmitter output stage and an internal dual charge pump requiring only four 0.1µF capacitors. Enhanced ESD protection provides ±15kV Human Body Model tolerance. A shutdown mode reduces supply current to less than 1µA while keeping receivers active.

Feature Summary

• Internal dual charge pump generates required voltage levels from a single low-voltage supply using minimal external capacitance.
• Enhanced electrostatic discharge protection ensures robustness against high-voltage static events without latch-up.
• Low-power shutdown mode significantly reduces consumption while maintaining receiver monitoring capability.
• Compatible with industry-standard pinouts for direct replacement of legacy RS-232 interface devices.

Applications

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

Procurement Notes

Verify the component matches the specific 18-pin PDIP package and the 'EC' commercial temperature range (0°C to +70°C). Confirm the '+' suffix indicates lead-free and RoHS compliance as per manufacturer specifications. Ensure the source document explicitly identifies this part number to avoid confusion with other variants in the MAX3222 family.

Selection Notes

Select this component when interfacing TTL/CMOS logic with RS-232 ports in space-constrained or battery-operated designs. It serves as a drop-in replacement for older MAX232/MAX242 equivalents. Consider the 250kbps speed limit and ensure the application does not require the higher MegaBaud speeds available in other family members like the MAX3237E.

Part Context

This device belongs to the MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E family of +3.0V-powered EIA/TIA-232 communications interface devices. The MAX3222E specifically denotes the variant with two drivers and two receivers. Other family members offer different driver/receiver counts or extended temperature ranges.

Replacement Considerations

Publicly confirmed compatible replacements include the MAX232 and MAX242 regarding pin, package, and functional compatibility. Verify that the substitute supports the required +3.0V to +5.5V operating voltage range and ESD protection levels.

FAQ

How does the shutdown mode affect receiver operation?

In shutdown mode (SHDN = GND), the supply current drops below 1µA. However, the receivers remain active, allowing the monitoring of 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 of 250kbps while maintaining RS-232 output levels under worst-case load conditions.

Does the MAX3222E support MegaBaud operation?

No, the MAX3222E does not feature MegaBaud operation. This functionality is specific to the MAX3237E within the same family, which can achieve 1Mbps rates.