MAX3221EUE+

Overview

The MAX3221EUE+ is a single-driver, single-receiver RS-232 transceiver in a 16-pin TSSOP 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 typical propagation delays of 0.3µs. Internal dual charge pumps generate ±5.5V using four 0.1µF capacitors. It features 15kV ESD protection on receiver inputs and operates within a -40°C to +85°C temperature range.

Feature Summary

• AutoShutdown technology reduces power consumption by disabling the onboard power supply and drivers when no valid RS-232 signal is present on receiver inputs.
• Integrated high-efficiency dual charge pump generates true RS-232 voltage levels from a single low-voltage supply without requiring external inductors or transformers.
• Provides robust interface reliability through integrated electrostatic discharge (ESD) protection rated at 15kV on receiver input pins.

Applications

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

Procurement Notes

Verify the specific suffix 'UE+' against official manufacturer documentation to confirm the TSSOP-16 package and industrial temperature grade (-40°C to +85°C). Ensure that ordering information matches the exact component designation required for your design specifications.

Selection Notes

Select this component for applications requiring minimal quiescent current during idle periods. The AutoShutdown feature is critical for battery-operated systems where cable disconnection must trigger immediate power reduction. Verify that the 235kbps maximum data rate meets the system's communication requirements.

Part Context

This part belongs to the MAX3221/MAX3223/MAX3243 family of 3V to 5.5V RS-232 transceivers. The MAX3221 variant specifically provides one driver and one receiver, distinguishing it from the two-channel MAX3223 and the five-receiver MAX3243.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.

FAQ

How does the AutoShutdown feature function?

When FORCEON is low and FORCEOFF is high, the device monitors receiver inputs. If no valid signal level is detected for 30µs, the internal power supply and drivers shut down, reducing supply current to 1µA.

What capacitor values are required 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 data rate supported?

The MAX3221 guarantees a 120kbps data rate under worst-case load conditions and typically supports data rates up to 235kbps.