MAX3222CPN

Overview

The MAX3222CPN+ is a true RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in an 18-pin Plastic DIP package. It operates from a single +3.0V to +5.5V supply and includes an internal dual charge pump requiring only four 0.1µF external capacitors. The device features two drivers and two receivers with guaranteed data rates of 120kbps at worst-case loads (3kΩ || 1000pF). Typical operation supports up to 235kbps. It provides shutdown mode with less than 1µA supply current and maintains compatibility with industry-standard MAX232 pinouts.

Feature Summary

• Integrated dual charge pump eliminates the need for bipolar ±12V supplies
• Shutdown mode reduces supply current to less than 1µA while keeping receivers active
• Always-on complementary receiver outputs enable monitoring without forward biasing protection diodes
• Compatible with 3V and 5V logic families including ACT, HCT CMOS, and TTL

Applications

• Battery-powered equipment
• Hand-held devices
• Peripherals
• Datacom equipment

Procurement Notes

Verify the ordering suffix matches the required temperature range and package type. The 'C' suffix indicates commercial operation from 0°C to +70°C, while 'E' denotes extended range. Confirm lead-free status via the '+' designation. Cross-reference the specific pinout requirements against legacy MAX232 designs if replacing older components.

Selection Notes

Select this component when interfacing 3V or 5V microcontrollers with RS-232 ports in space-constrained designs. The 18-pin DIP package suits through-hole prototyping or legacy board layouts. Ensure external capacitor values meet minimum requirements for the chosen supply voltage to maintain stable charge pump operation and signal integrity.

Part Context

This part belongs to the MAX3222/MAX3232/MAX3237/MAX3241 family of low-power RS-232 transceivers. While functionally similar to other members, the MAX3222 specifically offers two drivers and two receivers. It serves as a direct drop-in replacement for the industry-standard MAX232 in many applications, offering improved power efficiency and single-supply operation.

Replacement Considerations

MAX232 is the primary functional equivalent for pin-to-pin replacement in standard configurations.