MAX3225ECAP+T

Overview

The MAX3225ECAP+T is a dual driver/receiver RS-232 transceiver in a 20-pin SSOP package. It operates from a +3.0V to +5.5V supply and achieves a typical supply current of 1µA via AutoShutdown Plus. The device guarantees a maximum data rate of 1Mbps with ±5V transmitter output swings. It features an INVALID logic-level output for valid signal detection, a READY output indicating charge pump regulation, and FORCEON/FORCEOFF inputs for manual power control.

Feature Summary

• AutoShutdown Plus automatically reduces supply current to 1µA when the cable is disconnected or inputs remain inactive for over 30 seconds.
• MegaBaud operation ensures reliable 1Mbps data rates for high-speed applications such as ISDN modem communication.
• INVALID output provides a logic-level indication of valid RS-232 voltage presence on receiver inputs.
• READY output asserts high when the internal charge pumps are regulating and the device is ready for transmission.

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and handheld equipment
• Battery-powered peripherals and printers

Procurement Notes

Verify that the ordering suffix 'P+' confirms lead-free and RoHS compliance. Confirm the 'E' suffix indicates the industrial temperature range of -40°C to +85°C. Ensure the 'CAP' designation matches the required 20-pin SSOP physical footprint for your PCB layout.

Selection Notes

Select this model specifically for its guaranteed 1Mbps data rate capability. Verify that the system requires two drivers and two receivers. Consider the MAX3224 variant if only 250kbps performance is sufficient for the application.

Part Context

This component belongs to the MAX3224–MAX3227/MAX3244/MAX3245 family of 3V-powered EIA/TIA-232 interfaces. These devices share common features including AutoShutdown Plus technology and dual charge-pump voltage converters designed for low-voltage operation.

Replacement Considerations

Public confirmed substitutes include MAX3225EUP+, MAX3225CAP, and MAX3225EAP+. Verify pinout compatibility and ensure the replacement part supports the required 1Mbps data rate specification.

FAQ

How does the device enter low-power mode?

The device enters shutdown mode when FORCEOFF is high and no valid transition is detected on any receiver or transmitter input for more than 30 seconds.

What is the function of the INVALID output?

The INVALID output goes low when no valid RS-232 voltage levels are detected on all receiver inputs, indicating the absence of a valid signal.

Can unused transmitter inputs be left floating?

No, unused transmitter inputs should be connected to GND or VCC to prevent undefined states.