MAX3221EAE+

Overview

The MAX3221EAE+ is a single-driver, single-receiver RS-232 transceiver in a 16-pin SSOP package. It operates from a +3.0V to +5.5V supply and achieves 1µA current via AutoShutdown™ when no valid signal is detected for 30µs. The device supports data rates up to 235kbps with ±5.4V typical output swings. It requires four 0.1µF external capacitors for charge-pump operation. The E suffix indicates an extended temperature range of -40°C to +85°C.

Feature Summary

• AutoShutdown technology reduces power consumption by disabling the onboard power supply and drivers when receiver inputs are inactive.
• Integrated dual charge pump generates internal ±5.5V rails from a single low-voltage supply without requiring external ±12V sources.
• Provides true RS-232 performance with low-dropout transmitter outputs capable of driving standard loads at high data rates.

Applications

• Battery-powered equipment
• Hand-held devices
• Portable diagnostics equipment

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the package type and temperature rating. Confirm RoHS compliance status as indicated by the '+' suffix. Ensure the component source matches Analog Devices or Maxim Integrated specifications before integration into designs.

Selection Notes

Select this component for applications requiring minimal standby current and simplified power management. It is suitable for systems needing only one transmit and receive channel. Verify that the required data rate does not exceed 235kbps under worst-case loading conditions.

Part Context

This part belongs to the MAX3221/MAX3223/MAX3243 family of 3V-powered RS-232 transceivers. While the MAX3223 offers two channels and the MAX3243 provides three drivers with mouse driveability, the MAX3221 specifically addresses single-channel interface requirements within the same pin-compatible ecosystem.

Replacement Considerations

MAX3221CAE+

FAQ

How does the AutoShutdown feature function?

When FORCEON is low and FORCEOFF is high, the device monitors receiver inputs. If no valid RS-232 levels are detected for 30µs, the transmitters and charge pumps shut down, reducing supply current to 1µA.

What are the capacitor requirements for operation?

The device requires four external capacitors (C1–C4). For 3.3V operation, 0.1µF capacitors are sufficient. For 5.0V operation, C1 should be 0.047µF and C2–C4 should be 0.33µF.

What is the maximum guaranteed data rate?

The datasheet guarantees a data rate of 120kbps with worst-case loads. Typical operation supports data rates up to 235kbps.