MAX251CSD

Overview

The MAX251CSD is a monolithic, low-power RS-232 driver and receiver integrated circuit manufactured by Analog Devices Inc. (Maxim Integrated). Designed for single-supply operation at +5V, this component provides two drivers and two receivers to facilitate full-duplex communication compliant with EIA/TIA-232-F standards. The device incorporates internal charge pumps that generate the necessary positive and negative voltages from the single supply, eliminating the requirement for external dual-voltage power sources. It features low supply current consumption and supports data transmission rates up to 120kbps. The CSD suffix indicates a 16-lead Small Outline package.

Feature Summary

• Integrated charge pump eliminates need for external dual voltage supplies
• Low power consumption suitable for battery-operated systems
• Full compliance with EIA/TIA-232-F interface specifications

Applications

• Portable computers and laptop serial ports
• Battery-powered handheld terminals
• Industrial control systems requiring RS-232 connectivity

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature range. Ensure compatibility with system voltage requirements and signal integrity needs before procurement. Cross-reference the part number with authorized distributors to confirm availability and authenticity.

Selection Notes

Select the MAX251CSD when designing circuits requiring isolated or standard RS-232 communication with minimal external components. Consider its low power profile for portable applications. Verify that the 120kbps speed meets the system's data throughput requirements and that the 16-lead SO package fits the PCB layout constraints.

Part Context

The MAX251 is part of the broader MAX250/MAX251 family of RS-232 transceivers. While the MAX250 focuses on logic-level interfacing for isolation applications, the MAX251 provides direct RS-232 voltage levels. Both share similar low-power characteristics and internal charge pump technology, simplifying design for single-supply environments.

Replacement Considerations

Direct pin-compatible replacements include the MAX3232 series for higher speed requirements or the MAX232 for legacy designs. Verify electrical parameters such as drive strength and operating frequency when substituting to ensure system performance remains within specification.