MAX225CWI

Overview

The MAX225CWI is a +5V-powered, multichannel RS-232 transceiver from the MAX220–MAX249 family. It operates on a single +5V supply and utilizes an internal charge pump to generate ±10V for driver operation without external components. The device features four drivers and five receivers with TTL/CMOS-compatible inputs and outputs. It supports data rates up to 64 kbps and includes enable control pins for selective transmitter and receiver activation. The component is housed in a 28-pin Wide SOIC package and functions within a commercial temperature range of 0°C to +70°C.

Feature Summary

• Integrated charge pump circuitry eliminates the need for bipolar ±12V supplies or external capacitors.
• Enable control inputs allow independent selection of active transmitters and receivers to reduce power consumption.
• TTL and CMOS logic compatibility ensures direct interfacing with microcontrollers and digital systems.

Applications

• Interface translation between TTL/CMOS logic levels and RS-232 serial ports
• Multidrop RS-232 communication networks
• Portable diagnostic equipment requiring low-power serial connectivity

Procurement Notes

Verify the specific suffix 'W' corresponds to the 28-pin Wide SOIC package and the 'C' indicates the 0°C to +70°C operating range. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure ordering details match the exact pinout and electrical specifications required by the design.

Selection Notes

Select this component when board space is critical due to the elimination of external charge-pump capacitors. It is suitable for applications requiring multiple serial channels controlled independently via enable pins. Verify that the 64 kbps data rate meets system requirements and that the single +5V supply voltage aligns with the available power rails.

Part Context

This part belongs to the MAX220–MAX249 family of +5V-powered RS-232 transceivers. Unlike earlier generations requiring external capacitors, this series integrates the charge pump internally. The MAX225 variant specifically provides four drivers and five receivers, offering higher channel density compared to dual-channel counterparts in the same family.

Replacement Considerations

Direct replacements include other members of the MAX220–MAX249 family such as the MAX232A or MAX245, provided they support the required number of drivers and receivers. Verify that alternative parts maintain the same 28-pin Wide SOIC footprint and enable pin configurations for pin-to-pin compatibility.