MAX3222ECUP+

Overview

The MAX3222ECUP+ is a dual RS-232 transceiver manufactured by Analog Devices/Maxim Integrated, housed in a 20-pin TSSOP 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 worst-case loads of 3kΩ parallel to 1000pF. It incorporates an internal dual charge pump requiring four 0.1μF capacitors. ESD protection ratings include ±15kV (Human Body Model) and ±8kV (IEC Contact Discharge). Operating supply current is typically 1mA, reducing to less than 1μA in shutdown mode.

Feature Summary

• Integrated dual charge pump enables true RS-232 performance from a single low-voltage power supply without external transformers.
• Enhanced electrostatic discharge protection safeguards transmitter outputs and receiver inputs against high-voltage static events.
• Low-power shutdown mode significantly reduces supply current while keeping receiver inputs active for external signal monitoring.

Applications

• Battery-powered portable equipment
• Cell phones and smart phones
• Notebook, subnotebook, and palmtop computers

Procurement Notes

Verify the component authenticity through official manufacturer channels or authorized distributors. Confirm that the ordering suffix matches the specific temperature range and lead-free compliance requirements. Ensure the package type aligns with the design footprint before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring dual-channel RS-232 communication powered by a single voltage rail between 3.0V and 5.5V. It is suitable for applications needing reduced standby power consumption via shutdown control. Verify that the required data rate does not exceed 250kbps under standard load conditions.

Part Context

This part belongs to the MAX3222E/MAX3232E family of low-power RS-232 transceivers. It shares pinout compatibility with industry-standard MAX242 devices. The series is designed for space-constrained applications utilizing small surface-mount packages like TSSOP.

Replacement Considerations

The MAX3222ECUP+ is functionally compatible with the MAX242. Other members of the same family, such as the MAX3222EEUP+, offer extended industrial temperature ranges (-40°C to +85°C) compared to the commercial range of the EC variant.

FAQ

How does the shutdown mode affect receiver functionality?

In shutdown mode, the supply current drops below 1μA. However, the receiver inputs remain active, allowing the device to monitor external signals even when the transmitters are disabled.

What capacitor values are required for operation at 3.3V?

Operation from a +3.3V supply requires four small 0.1μF capacitors connected to the internal charge pump terminals.

Is the device compatible with 5V logic levels?

Yes, the device operates within a +3.0V to +5.5V supply range and maintains RS-232 output levels compliant with EIA/TIA-232 standards across this voltage spectrum.