MAX3225EAP+T

Overview

The MAX3225EAP+T is a dual driver, dual receiver RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +3.0V to +5.5V supply and achieves a typical supply current of 1µA through the AutoShutdown Plus feature. The device guarantees a maximum data rate of 1Mbps (MegaBaud) and includes an internal dual charge pump requiring four small capacitors for voltage generation. It is housed in a 20-pin SSOP package and supports full-duplex communication with EIA/TIA-232 standards.

Feature Summary

• AutoShutdown Plus technology automatically reduces power consumption when the interface is idle or disconnected.
• MegaBaud operation ensures reliable high-speed data transmission up to 1Mbps.
• Integrated dual charge pump generates required RS-232 voltages from low-voltage supplies using minimal external components.

Applications

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

Procurement Notes

Verify the specific suffix 'EAP+T' against official manufacturer documentation to confirm the exact pinout, temperature range, and packaging configuration. Ensure compatibility with the required operating environment and signal integrity requirements before finalizing procurement decisions.

Selection Notes

Select this component for applications requiring low-power standby modes and high-speed serial communication over short distances. Consider the 20-pin SSOP footprint constraints and verify that the system design accommodates the necessary external capacitor values for the charge pump circuitry.

Part Context

This part belongs to the MAX3224–MAX3227/MAX3244/MAX3245 family of RS-232 transceivers. These devices share common features such as the AutoShutdown Plus functionality and dual charge pump architecture, differing primarily in the number of drivers/receivers and guaranteed data rates.

Replacement Considerations

Public confirmed substitute part numbers: MAX3225CAP+, MAX3225CPP+, MAX3225CUP+. Verify pin compatibility and electrical specifications before substitution.

FAQ

How does the AutoShutdown Plus feature function?

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

What is the maximum data rate supported by the MAX3225?

The MAX3225 guarantees a maximum data rate of 1Mbps, enabling MegaBaud operation for high-speed applications.

What external components are required for the charge pump?

The device requires four small capacitors (typically 0.1µF for 3.3V operation) connected to the C1+, C1-, C2+, and C2- pins to generate the necessary positive and negative voltages.