MAX3221CAE+TG1Z

Overview

The MAX3221CAE+TG1Z 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 supply current via the AutoShutdown feature when no valid signal is detected on receiver inputs for 30µs. The device supports data rates up to 235kbps with typical propagation delays of 0.3µs. Internal dual charge pumps generate ±5.5V levels using four 0.1µF capacitors. The INVALID pin indicates receiver activity status.

Feature Summary

• AutoShutdown functionality reduces power consumption by disabling internal power supplies and drivers during periods of inactivity.
• Integrated dual charge-pump circuitry generates required RS-232 voltage swings directly from a single low-voltage supply.
• INVALID output pin provides real-time indication of valid RS-232 signal presence at receiver inputs.

Applications

• Battery-powered equipment requiring extended standby life
• Hand-held devices and portable diagnostics equipment
• Peripherals interfacing with microprocessors or UARTs

Procurement Notes

Verify the specific suffix TG1Z against official manufacturer documentation to confirm tape-and-reel packaging and lot traceability requirements. Confirm RoHS compliance status and ensure the component matches the intended thermal and mechanical specifications for the target assembly process.

Selection Notes

Select this component for designs requiring minimal quiescent current and simplified power management without external voltage regulators. Ensure the application logic can tolerate the wake-up time associated with the AutoShutdown feature or utilize FORCEON/FORCEOFF pins for software-controlled operation.

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 five receivers with complementary outputs, the MAX3221 specifically addresses applications needing only one transmitter and one receiver channel.

Replacement Considerations

MAX3221CAE+ (Tube Packaging)

FAQ

How does the AutoShutdown feature determine when to enter low-power mode?

The device enters shutdown mode if all receiver inputs remain between +0.3V and -0.3V for at least 30µs, reducing supply current to 1µA.

What is the function of the INVALID output pin?

The INVALID pin goes high when a valid RS-232 level is present on any receiver input and goes low when the device is in shutdown mode due to lack of activity.