MAX3224ECUP+T

Overview

The MAX3224ECUP+T is a dual RS-232 transceiver from the MAX3224E family, manufactured by Analog Devices (Maxim Integrated). It operates on a single +3.0V to +5.5V supply and features AutoShutdown Plus technology, achieving a typical supply current of 1μA when inactive. The device guarantees a data rate of 250kbps with full-duplex communication via two drivers and two receivers. It includes ±15kV ESD protection on all I/O pins and provides a READY output signal indicating charge pump regulation status. The component is housed in a 20-pin TSSOP package and supports an operating temperature range of 0°C to +70°C.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by disabling internal charge pumps during periods of inactivity.
• Integrated dual charge pump generates required positive and negative voltage rails for true RS-232 signaling without external components.
• 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 such as printers

Procurement Notes

Verify the specific suffix 'CUP' corresponds to the 20-pin TSSOP package and commercial temperature grade (+0°C to +70°C) before procurement. Confirm RoHS compliance status indicated by the '+' symbol matches project requirements. Ensure the ordering part number aligns exactly with the datasheet listing to avoid pinout or electrical specification mismatches.

Selection Notes

Select this component for applications requiring low-power standby modes in portable electronics. The 250kbps data rate suits standard serial communication needs where higher speeds are unnecessary. Consider the 20-pin TSSOP footprint for space-constrained designs. Verify that the system UART logic levels match the input thresholds and that the 1μA shutdown current meets strict battery life requirements.

Part Context

This part belongs to the MAX3224E/MAX3225E/MAX3226E/MAX3227E series of 3V-powered RS-232 transceivers. It shares core architecture with the MAX3225E but offers a lower guaranteed data rate of 250kbps compared to the MegaBaud-capable variants. The ECUP variant specifically denotes the commercial temperature range and TSSOP packaging within this broader product family.

Replacement Considerations

MAX3224ECUP: Non-RoHS compliant version of the same electrical specifications and package.

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, typically occurring when the cable is disconnected or peripherals are 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 reached sufficient voltage levels to begin transmitting RS-232 signals.

Can unused transmitter inputs be left floating?

No, unused transmitter inputs should be connected to GND or VCC, as they do not have internal pull-up resistors.