MAX3225CPP+

Overview

The MAX3225CPP+ is a dual RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 20-pin PDIP package. It operates on a single +3.0V to +5.5V supply and achieves a typical supply current of 1µA through AutoShutdown Plus technology. The device guarantees a data rate of 1Mbps for high-speed applications. It features two drivers and two receivers with full-duplex communication capability. The operating temperature range is specified from 0°C to +70°C.

Feature Summary

• AutoShutdown Plus functionality 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 voltage levels without external transformers.

Applications

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

Procurement Notes

Verify the component authenticity by checking the manufacturer marking against official documentation. Confirm the package type matches the 20-pin PDIP specification. Ensure the suffix indicates lead-free/RoHS compliance as per the ordering information. Cross-reference the date code to ensure the part meets current manufacturing standards.

Selection Notes

Select this model for systems requiring low-power standby modes and high-speed serial communication. The PDIP package is suitable for through-hole mounting on standard PCBs. Verify that the application environment stays within the 0°C to +70°C commercial temperature range. Ensure the system voltage falls between 3.0V and 5.5V for proper charge pump operation.

Part Context

This component belongs to the MAX3224–MAX3227/MAX3244/MAX3245 family of RS-232 transceivers. It shares core architectural features with other members like the MAX3224 and MAX3226 but offers higher data rate capabilities. The family is designed for battery-powered portable electronics requiring efficient power management.

Replacement Considerations

Compatible substitutes include MAX3224CPP+, MAX3226CPP+, and MAX3227CPP+. These parts share the same package and pinout but may differ in guaranteed data rates or specific driver configurations. Verify electrical characteristics match the original design requirements before substitution.

FAQ

How does the AutoShutdown Plus feature function?

It automatically shuts down the transmitters and charge pumps if no valid signal transition is detected on any input for more than 30 seconds, reducing supply current to 1µA. The device wakes up upon sensing a valid transition.

What is the purpose of the READY output?

The READY output asserts high when the internal charge pumps are regulating and the device has reached stable operating voltages, indicating it is ready to begin transmitting data.

Can unused transmitter inputs be left floating?

No, unused transmitter inputs should be connected to GND or VCC to prevent undefined states. The datasheet explicitly states that transmitter inputs do not have pull-up resistors.