MAX231CWE

Overview

The MAX231CWE is a +5V-powered, multichannel RS-232 driver and receiver integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 4.5V to 5.5V and supports data rates up to 160kbps. The device features one transmitter and two receivers, providing full-duplex communication capabilities. It utilizes an internal charge pump to generate the required ±10V levels from a single +5V supply, requiring four external capacitors (typically 1µF) for operation. The component is housed in a 16-pin Wide SOIC package and is rated for commercial operating temperatures ranging from 0°C to +70°C.

Feature Summary

• Integrates dual charge-pump DC-DC converters to generate internal ±10V supplies from a single +5V source
• Provides one RS-232 driver and two RS-232 receivers for standard serial communication interfaces
• Supports TTL/CMOS input logic levels with RS-232 compliant output voltage swings

Applications

• Interface translation between TTL/CMOS logic and RS-232 standards
• Multidrop RS-232 network connections
• Portable diagnostic equipment requiring single-supply operation

Procurement Notes

Verify the specific suffix 'CWE' against the manufacturer's current ordering guide to confirm the package type and temperature grade. Ensure that the required external capacitors are included in the bill of materials, as the MAX231 does not contain integrated capacitors unlike other variants in the family. Confirm RoHS compliance status through official documentation prior to procurement.

Selection Notes

Select this component when a single +5V supply is available and external capacitors can be accommodated on the PCB layout. Compare against MAX232 or MAX233 if integrated capacitors or different channel counts are required. Verify that the 160kbps data rate meets the system requirements and that the 0°C to +70°C temperature range is sufficient for the intended environment.

Part Context

The MAX231 belongs to the MAX220–MAX249 family of +5V-powered, multichannel RS-232 drivers and receivers. This family is designed for applications where bipolar ±12V supplies are unavailable. The MAX231 specifically offers one driver and two receivers, distinguishing it from other members like the MAX232 which provides two drivers and two receivers.

Replacement Considerations

The MAX232 is a pin-compatible alternative offering two drivers instead of one. The MAX233 is a pin-compatible option featuring integrated capacitors, eliminating the need for external components.