MAX3226EEUE+T

Overview

The MAX3226EEUE+T is a single-channel RS-232 transceiver in a 16-pin TSSOP package. It operates from 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 idle. Transmitter outputs and receiver inputs are protected against ±15kV ESD (Air-Gap), ±8kV (Contact), and ±15kV (Human Body Model). It utilizes a dual charge pump requiring four 0.1μF capacitors for operation.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by shutting down internal charge pumps during periods of inactivity.
• Integrated dual charge pump generates true RS-232 voltage levels from a single low-voltage supply without external transformers.
• Enhanced electrostatic discharge protection on all I/O pins ensures robust performance in high-interference environments.

Applications

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

Procurement Notes

Verify the component authenticity through authorized distributors or direct manufacturer channels. Confirm that the ordering suffix matches the required package type and temperature range specifications. Ensure compliance with RoHS standards as indicated by the plus sign in the part number. Cross-reference the datasheet revision to confirm pinout compatibility before integration into existing designs.

Selection Notes

Select this specific variant for applications requiring a single transmitter and receiver channel within space-constrained designs. The TSSOP package offers a compact footprint suitable for surface-mount assembly. Consider the 250kbps speed limit when designing for high-speed communication links, as higher baud rates require alternative models within the same family.

Part Context

This component belongs to the MAX3224E–MAX3227E series of RS-232 transceivers manufactured by Analog Devices / Maxim Integrated. The series shares common architectural features including AutoShutdown Plus and enhanced ESD protection, differing primarily in the number of drivers and receivers provided per package.

Replacement Considerations

The MAX3226EEAE+T serves as a functional equivalent utilizing an SSOP-16 package instead of TSSOP. Designers must verify mechanical footprint compatibility and thermal dissipation characteristics when substituting between these package types.

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.

How many external capacitors are required for the charge pump operation?

Four small 0.1μF capacitors are required to operate the dual charge pump from a 3.3V supply, generating the necessary positive and negative voltages.