MAX3226EAE+T

Overview

The MAX3226EAE+T is a single-driver, single-receiver RS-232 transceiver from the MAX3226E series. It operates on a +3.0V to +5.5V supply and guarantees a data rate of 250kbps. The device features AutoShutdown Plus technology, reducing supply current to 1µA when inputs are inactive for over 30 seconds. It includes a dual charge pump requiring four 0.1µF capacitors at 3.3V. Key pins include READY (active high), INVALID (active low), FORCEON, and FORCEOFF. It provides ±15kV ESD protection on I/O pins and operates within a -40°C to +85°C temperature range in an SSOP-16 package.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by shutting down internal circuitry during periods of inactivity.
• Integrated dual charge pump generates required RS-232 voltage levels using minimal external capacitance.
• Logic-level outputs provide status indication regarding charge pump regulation and valid signal detection.

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and handheld equipment
• Battery-powered peripherals and printers

Procurement Notes

Verify the specific suffix 'AE' corresponds to the SSOP-16 package and the '+T' indicates tape-and-reel packaging. Confirm RoHS compliance and lead-free status as indicated by the '+' designation. Ensure the source document explicitly supports the ordering information provided.

Selection Notes

Select this component for applications requiring low-power RS-232 communication with automatic shutdown capabilities. It is suitable for systems needing 250kbps data rates where power conservation is critical. Verify that the SSOP-16 package fits the design constraints and that the 3.0V to 5.5V supply range matches the system architecture.

Part Context

This part belongs to the MAX3224–MAX3227 family of 3V-powered RS-232 transceivers. While the MAX3225/MAX3227 support 1Mbps speeds, the MAX3226 variant is optimized for 250kbps operation. All devices share the same core AutoShutdown Plus feature and pinout structure, differing primarily in guaranteed data rates.

Replacement Considerations

The MAX3226EAAE+ is a tube-packaged equivalent of the MAX3226EEAE+T. Other family members like the MAX3224E or MAX3227E offer similar functionality but may differ in data rate specifications or package availability.

FAQ

How does the AutoShutdown Plus feature determine when to shut down?

The device enters shutdown mode when no valid transition is sensed on any receiver or transmitter input for more than 30 seconds.

What is the function of the INVALID output pin?

The INVALID output goes low when no valid RS-232 voltage levels are detected on all receiver inputs, indicating an inactive or disconnected cable state.

Can the transmitters be forced on manually?

Yes, driving the FORCEON pin high overrides the AutoShutdown Plus feature, keeping the transmitters and receivers active regardless of input activity.