MAX238ENG+

Overview

The MAX238ENG+ is a +5V-powered, multichannel RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It integrates four drivers and four receivers to support full-duplex communication at data rates up to 120 kbps. The device operates from a single +5V supply, utilizing internal charge pump circuitry to generate the necessary ±10V levels for RS-232 signaling without external bipolar supplies. Packaged in a 24-pin Narrow DIP (0.300 inch) format, it is designed for EIA/TIA-232E and V.28/V.24 interface applications where board space and power supply complexity are constraints.

Feature Summary

• Integrates four drivers and four receivers within a single package
• Operates from a single +5V power supply eliminating need for external bipolar rails
• Includes internal charge pump circuitry for voltage generation
• Supports full-duplex data transmission up to 120 kbps

Applications

• Interface translation between TTL/CMOS logic and RS-232 standards
• Multidrop RS-232 network connections
• Portable diagnostic equipment requiring compact serial interfaces

Procurement Notes

Verify component authenticity through authorized distribution channels due to potential availability of refurbished or counterfeit units. Confirm the specific engineering grade suffix matches design requirements. Check current lifecycle status as older Maxim parts may be discontinued or subject to last-time-buy restrictions. Ensure packaging integrity upon receipt to prevent pin damage during installation.

Selection Notes

Select this component when designing systems requiring four independent RS-232 channels with minimal external passive components. It is suitable for applications constrained by single +5V power availability. Compare against the MAX232 family for channel count differences. Verify that the 120 kbps speed meets system timing requirements. Consider the 24-pin DIP package for prototyping or through-hole manufacturing processes.

Part Context

The MAX238 belongs to the broader MAX220–MAX249 family of +5V-powered multichannel RS-232 drivers and receivers. This series was developed to simplify RS-232 interface design by integrating charge pumps and reducing external capacitor counts. The MAX238 specifically provides a higher channel count compared to dual-channel variants like the MAX232, offering a solution for more complex serial communication needs within the same footprint constraints.

Replacement Considerations

Direct replacements include other members of the MAX220-MAX249 family such as the MAX232 for reduced channel counts or the MAX233/MAX235 for integrated capacitor options. Cross-reference with the MAX3238 for lower voltage operation if system power changes. Verify pin compatibility and electrical specifications before substituting.