MAX3227EEUE+

Overview

The MAX3227EEUE+ is a single-channel, full-duplex RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of +3.0V to +5.5V and supports data rates up to 1Mbps. The device incorporates AutoShutdown Plus technology, reducing supply current to 1μA when idle. It features ±15kV ESD protection on all I/O pins and includes a READY output signal. Packaged in a 16-pin TSSOP, it functions across an industrial temperature range of -40°C to +85°C.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption during periods of inactivity or cable disconnection.
• Integrated dual charge pump generates internal ±5.5V supplies from a single low-voltage source using minimal 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 suffix EEUE+ corresponds to the TSSOP-16 package and the -40°C to +85°C extended temperature grade. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure ordering details match the exact pinout and thermal requirements for the target PCB layout.

Selection Notes

Select this component for applications requiring single-driver RS-232 communication with strict power management needs. The 1Mbps data rate suits high-speed modem connections. Verify that the TSSOP-16 footprint aligns with available board space and that the 3.0V to 5.5V supply range matches the system's power architecture.

Part Context

This part belongs to the MAX3224E–MAX3227E family of 3V-powered RS-232 interfaces. While sharing core features like AutoShutdown Plus and ESD protection, the MAX3227E specifically provides one driver and one receiver, distinguishing it from dual-channel variants like the MAX3224E.

Replacement Considerations

Direct functional substitutes within the same series include the MAX3227ECTE+ (TQFN package) and MAX3227EEAE+ (SSOP package). These alternatives maintain identical electrical specifications but differ in physical package dimensions and thermal characteristics.

FAQ

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

The device enters shutdown mode if no valid signal transition is detected on any receiver or transmitter input for more than 30 seconds, such as when the cable is disconnected or the UART is inactive.

What is the function of the READY output pin?

The READY output asserts high when the internal charge pumps are regulating and the device has generated sufficient voltage to begin transmitting RS-232 signals.

Does the INVALID output depend on the FORCEON or FORCEOFF control states?

No, the INVALID output indicates the presence of valid RS-232 voltage levels on the receiver inputs independently of the FORCEON and FORCEOFF control states.