MAX3224EETP+T

Overview

The MAX3224EETP+T is a dual RS-232 transceiver from the MAX3224E family, manufactured by Analog Devices Inc. (Maxim Integrated). 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 a receiver propagation delay of 0.15μs. It includes an internal dual charge pump requiring four 0.1μF capacitors for operation at 3.3V. ESD protection is rated at ±15kV (Air-Gap), ±8kV (Contact), and ±15kV (Human Body Model). The component is housed in a 20-pin TQFN package with an exposed pad and supports an operating temperature range of -40°C to +85°C.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by disabling charge pumps during periods of inactivity.
• Integrated dual charge pump generates required RS-232 voltage levels using only four small external capacitors.
• Enhanced electrostatic discharge protection ensures robustness against high-voltage static events on I/O lines.

Applications

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

Procurement Notes

Verify the specific suffix 'ETP' corresponds to the -40°C to +85°C temperature range and the 20-pin TQFN-EP package configuration. Confirm lead-free/RoHS compliance status associated with the '+' designation. Ensure the ordering information matches the exact pinout and electrical characteristics defined in the official datasheet before finalizing procurement.

Selection Notes

Select this component for applications requiring low-power RS-232 communication in space-constrained designs. The 250kbps data rate suits standard serial interfaces, while the 1μA shutdown current extends battery life in portable electronics. Consider the TQFN-EP package for thermal management and compact footprint requirements compared to larger DIP or SSOP alternatives.

Part Context

This part belongs to the MAX3224E/MAX3225E/MAX3226E/MAX3227E/MAX3244E/MAX3245E family of 3V-powered RS-232 transceivers. It shares core features like AutoShutdown Plus and ESD protection with siblings offering different driver/receiver counts or higher MegaBaud speeds. The MAX3224E specifically provides two drivers and two receivers with a guaranteed 250kbps rate.

Replacement Considerations

Pin-compatible alternatives within the same family include MAX3224ECUP+, MAX3224ECAP+, and MAX3224ECPP+. Verify that substitute parts match the required operating temperature range (-40°C to +85°C) and package type (TQFN-EP) to ensure mechanical and thermal compatibility.

FAQ

How does the AutoShutdown Plus feature reduce power consumption?

It automatically shuts down the onboard charge pumps and disables transmitter outputs when no valid signal transition is detected on any input for more than 30 seconds, reducing supply current to approximately 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 generated sufficient voltage to begin transmitting, indicating the transceiver is ready for operation.

How many external capacitors are required for the charge pump?

Four small 0.1μF capacitors are required for operation from a 3.3V supply, connected to the C1+, C1-, C2+, and C2- pins.