MAX3225ECTP+

Overview

The MAX3225ECTP+ is a dual driver, dual receiver RS-232 transceiver from the MAX3224–MAX3227 family. It supports data rates up to 1Mbps and operates on a single +3.0V to +5.5V supply. The device features AutoShutdown Plus technology, achieving a typical 1µA supply current when inactive. It includes an internal dual charge pump requiring four small capacitors for voltage generation. The component provides ±5V transmitter output swings and incorporates a READY output pin to indicate charge pump regulation status.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by disabling the charge pump during periods of inactivity or cable disconnection.
• MegaBaud operation capability ensures reliable high-speed communication at data rates up to 1Mbps.
• Integrated logic-level READY output signal indicates 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 the specific suffix ECTP+ against official documentation to confirm the package type (TQFN-EP) and temperature range (-40°C to +85°C). Ensure that ordering information matches the exact part number to avoid discrepancies in pinout or electrical characteristics compared to other variants in the series.

Selection Notes

Select this component for applications requiring low-power standby modes and high-speed serial communication over standard RS-232 interfaces. The MegaBaud feature distinguishes it from the 250kbps variants within the same family. Consider the exposed pad requirement for thermal management if operating at higher temperatures or load conditions.

Part Context

This part belongs to the MAX3224–MAX3227/MAX3244/MAX3245 family of 3V-powered RS-232 transceivers. While sharing core features like AutoShutdown Plus and dual charge pumps, the MAX3225 variant is specifically optimized for 1Mbps data rates, unlike the MAX3224 and MAX3226 which are limited to 250kbps.

Replacement Considerations

Public confirmed substitute part numbers: MAX3225EETP+, MAX3225ECUE+. Verify package compatibility and temperature range specifications before substitution.

FAQ

How does the AutoShutdown Plus feature reduce power consumption?

It automatically shuts down the onboard charge pumps and disables transmitters when no valid signal transition is detected on any receiver or transmitter input for more than 30 seconds, reducing supply current to 1µA.

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 reliably.

What capacitor values are required for 3.3V operation?

For a 3.3V supply, the datasheet specifies using 0.1µF capacitors for C1 through C4.