MAX3224ECUP+

Overview

The MAX3224ECUP+ is a dual RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 20-pin TSSOP package. It operates within a +3.0V to +5.5V supply range and supports full-duplex communication at data rates up to 250kbps. The device incorporates AutoShutdown Plus technology, reducing supply current to 1μA when idle. It features ±15kV ESD protection on all I/O lines and includes logic-level READY and INVALID outputs for system status monitoring.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption during periods of inactivity
• Integrated dual charge pump enables true RS-232 performance from low-voltage single supplies
• Enhanced electrostatic discharge protection on transmitter outputs and receiver inputs

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and battery-powered equipment
• Hand-held devices and peripherals such as printers
• Automotive applications

Procurement Notes

Verify the specific suffix 'C' indicates the commercial temperature range (0°C to +70°C) rather than the extended industrial range (-40°C to +85°C). Confirm that the 'U' package code corresponds to the 20-pin TSSOP form factor required for your PCB layout. Ensure compatibility with lead-free/RoHS-compliant manufacturing processes.

Selection Notes

Select this component when a dual-channel interface is sufficient for the design. Consider alternative models like the MAX3225E if higher data rates up to 1Mbps are required. Evaluate the MAX3244E or MAX3245E if additional drivers or receivers are needed for complex peripheral connections.

Part Context

This part belongs to the MAX3224E/MAX3225E/MAX3226E/MAX3227E/MAX3244E/MAX3245E family of RS-232 transceivers. These devices share common architectural features including AutoShutdown Plus and high ESD protection, differing primarily in channel count and guaranteed data rate specifications.

Replacement Considerations

Public confirmed substitutes include MAX3224EEUP+, MAX3224ECAP+, and MAX3224ECTP+. Verify pinout compatibility and thermal resistance characteristics when transitioning between different package types such as SSOP, TQFN, or Plastic DIP.

FAQ

How does the AutoShutdown Plus feature function?

It automatically enters a low-power shutdown mode when the RS-232 cable is disconnected or inputs remain inactive for more than 30 seconds, waking up upon sensing a valid transition.

What is the purpose of the INVALID output?

The INVALID output goes low when no valid RS-232 voltage levels are detected on any receiver input, indicating the absence of an active signal.

Can unused transmitter inputs be left floating?

No, unused transmitter inputs should be connected to GND or VCC to prevent undefined states, as they do not have internal pullup resistors.