MAX3224ECAP

Overview

The MAX3224ECAP+ is a dual RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 20-pin SSOP package. 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 two drivers and two receivers. It includes ±15kV ESD protection on all I/O pins and provides a READY output signal to indicate charge pump regulation status.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by shutting down internal charge pumps during periods of inactivity.
• Integrated dual charge pump generates required positive and negative voltage rails from a single low-voltage supply.
• Enhanced electrostatic discharge protection ensures robustness against high-voltage static events on communication lines.

Applications

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

Procurement Notes

Verify the specific suffix 'CAP+' corresponds to the 20-pin SSOP package and commercial temperature range (0°C to +70°C). Confirm lead-free/RoHS compliance status as indicated by the '+' designation. Ensure the ordering code matches the exact pinout and thermal requirements for the target PCB layout.

Selection Notes

Select this component for applications requiring low standby power without BIOS modifications. The 250kbps data rate suits standard serial communications. Consider alternative models within the family if higher speeds or different driver/receiver counts are necessary. Verify that the SSOP footprint aligns with available assembly capabilities.

Part Context

This part belongs to the MAX3224E/MAX3225E/MAX3226E/MAX3227E/MAX3244E/MAX3245E family of 3V-powered RS-232 transceivers. These devices share common features such as AutoShutdown Plus and ESD protection but vary in data rates, driver counts, and package options to suit diverse interface requirements.

Replacement Considerations

Public confirmed substitutes include MAX3224EEAP+ (-40°C to +85°C) and MAX3224EAAP+ (-40°C to +125°C), which offer extended temperature ranges while maintaining the same SSOP package and functional specifications.

FAQ

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

The device enters shutdown mode when 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 is ready to begin transmitting. It goes low when the charge pumps are disabled in shutdown mode.

What external components are required for operation?

Operation requires four small capacitors (typically 0.1μF) connected to the charge pump terminals to generate the necessary positive and negative voltage rails from the single supply.