MAX3225ECTP+T

Overview

The MAX3225ECTP+T is a dual driver/receiver RS-232 transceiver in a 20-pin TQFN-EP package. It operates from a +3.0V to +5.5V supply and achieves a typical 1µA shutdown current via AutoShutdown Plus. The device guarantees 1Mbps data rates with ±5V transmitter output swings. It features an internal dual charge pump requiring four 0.1µF capacitors for 3.3V operation. Key control pins include FORCEON, FORCEOFF, INVALID, and READY outputs.

Feature Summary

• AutoShutdown Plus technology automatically reduces supply current when the interface is idle or disconnected.
• MegaBaud capability ensures reliable 1Mbps communication speeds for high-performance applications.
• Integrated logic-level READY output indicates when the internal charge pumps are regulating and 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 manufacturer documentation to confirm the exact pin-compatible package type and lead-free status. Confirm availability through authorized distributors as stock levels fluctuate. Ensure the ordering information matches the required temperature range and packaging format for your production needs.

Selection Notes

Select this component for designs requiring low-power RS-232 interfaces in compact space-constrained environments. The TQFN-EP package offers a smaller footprint compared to traditional SSOP or PDIP options. Verify that the application supports the necessary external capacitor values for the charge pump operation at the target supply voltage.

Part Context

This part belongs to the MAX3224–MAX3227 family of RS-232 transceivers featuring AutoShutdown Plus. It shares core electrical characteristics with other members like the MAX3225ECUP+, differing primarily in the physical package configuration. The family is designed for portable electronics requiring efficient power management without sacrificing data throughput.

Replacement Considerations

Direct replacements within the same package and specification include the MAX3225ECUP+ (TSSOP) if pin compatibility allows, or the MAX3225CAP+ (SSOP). Verify that any substitute maintains the 1Mbps data rate guarantee and the specific 20-pin TQFN-EP form factor required by the PCB layout.

FAQ

How does the AutoShutdown Plus feature function?

The device enters a low-power shutdown mode when all receiver and transmitter inputs remain inactive for more than 30 seconds. It automatically wakes up upon detecting a valid signal transition on any input.

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. It indicates the presence or absence of a valid signal independent of the FORCEON and FORCEOFF states.

What external components are required for operation?

The device requires four small capacitors (C1–C4) for the internal dual charge pump. For 3.3V operation, 0.1µF capacitors are sufficient. A bypass capacitor may also be used for VCC decoupling.