MAX3226ECAE

Overview

The MAX3226ECAE is a single-channel RS-232 transceiver from the MAX3224E–MAX3227E family, designed for 3.0V to 5.5V supplies. It guarantees a data rate of 250kbps with ±15kV ESD protection on I/O pins. The device features AutoShutdown Plus technology, reducing supply current to 1μA when idle. It includes a READY output indicating charge pump regulation and an INVALID output for signal presence detection. Operating temperatures range from -40°C to +85°C for the EE suffix variant.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by shutting down internal charge pumps during periods of inactivity or cable disconnection.
• Integrated dual charge pump generates required RS-232 voltage levels using only four small external capacitors.
• Enhanced electrostatic discharge protection ensures robustness against high-voltage static events on transmitter and receiver lines.

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and battery-powered equipment
• Hand-held devices and peripherals

Procurement Notes

Verify the specific ordering suffix (e.g., CAE) to confirm package type and temperature range. Ensure compatibility with existing BIOS or operating system configurations if relying on automatic shutdown features without software intervention. Cross-reference pinouts for TSSOP packages to avoid layout errors.

Selection Notes

Select this model for applications requiring a single transmitter and receiver pair. Choose variants with higher guaranteed data rates (1Mbps) if communicating with ISDN modems or high-speed peripherals. Consider the MAX3244E/MAX3245E if additional receivers or complementary outputs are needed for ring indicator monitoring.

Part Context

This component belongs to the MAX3224E through MAX3245E series of low-power RS-232 transceivers. It shares core architecture with the MAX3224E and MAX3225E but differs in channel count and speed specifications. The series is characterized by its ability to operate from a single low-voltage supply while maintaining true RS-232 performance standards.

Replacement Considerations

Direct functional substitutes within the same family include the MAX3224E (dual channel, 250kbps) and MAX3225E (dual channel, 1Mbps). For single-channel needs with higher speed, the MAX3227E is the appropriate alternative. Verify package dimensions and pinout compatibility before substitution.

FAQ

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

The device enters low-power mode when all receiver and transmitter inputs remain inactive for more than 30 seconds, or if the RS-232 cable is disconnected. It wakes up upon sensing a valid transition at any input.

What is the function of the INVALID output pin?

The INVALID output indicates whether a valid RS-232 voltage level is present on the receiver inputs. It goes low when no valid signal is detected and is independent of the FORCEON and FORCEOFF control states.

Can the MAX3226ECAE support data rates above 250kbps?

No, the MAX3226E specifically guarantees operation up to 250kbps. Higher speeds up to 1Mbps are available in the MAX3225E and MAX3227E models within the same family.