MAX238ERG

Overview

The MAX238ERG is a fully compliant RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It features four drivers and four receivers, supporting full-duplex communication at data rates up to 120 kbps. The device operates on a single 4.5V to 5.5V supply with a typical quiescent current of 2 mA. It utilizes internal charge pumps to generate ±6V from the single supply, eliminating the need for external voltage sources. The component includes 500 mV receiver hysteresis for noise immunity and offers 15 kV ESD protection on I/O pins. It is housed in a 24-SOIC package and rated for an industrial temperature range of -40°C to +85°C.

Feature Summary

• Fully compliant with EIA/TIA-232E and V.28/V.24 standards
• Integrated charge pump eliminates requirement for external dual supplies
• High noise immunity via 500 mV receiver hysteresis
• Robust protection against electrostatic discharge events

Applications

• Industrial equipment serial communication ports
• Test and measurement instrument interfaces
• Point-of-sale (POS) systems requiring reliable RS-232 connectivity

Procurement Notes

Verify the specific suffix 'ERG' against official manufacturer documentation to confirm the exact package type and temperature grade. Ensure compatibility with existing PCB footprints for the 24-SOIC form factor. Confirm RoHS compliance status through the latest datasheet revision before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring four independent RS-232 channels without external power rails. It is suitable for applications needing moderate data speeds up to 120 kbps. Consider the 24-SOIC package constraints during layout planning. Verify that the 4.5V minimum supply voltage aligns with the system's power architecture.

Part Context

The MAX238 belongs to the MAX220–MAX249 family of multichannel RS-232 drivers and receivers. This series is designed for applications where generating ±12V is impractical. The MAX238 specifically provides four driver/receiver pairs, offering higher channel density compared to single-channel variants while maintaining standard RS-232 signal levels.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.