74LCX540SJ

Overview

The Fairchild Semiconductor 74LCX540SJ is a low-voltage octal buffer and line driver featuring inverting outputs with three-state capability. It operates within a supply voltage range of 2V to 3.6V. The device incorporates 5V tolerant inputs and outputs, allowing safe interfacing between 3.3V logic systems and legacy 5V components. Packaged in a 20-SOP format, it contains eight independent buffering elements designed for high-speed digital signal transmission.

Feature Summary

• Provides five-volt tolerant input and output interfaces for mixed-voltage system compatibility
• Features three-state outputs to facilitate bus-oriented architectures and data sharing
• Delivers inverting buffer functionality for signal conditioning and inversion

Applications

• Bus-oriented memory and address drivers
• Clock distribution and buffering circuits
• Data register I/O buffering in mixed-voltage environments

Procurement Notes

Verify the specific suffix SJ corresponds to the 20-SOP package configuration when sourcing. Confirm that the operating supply voltage requirements align with your system's 2V to 3.6V specification. Ensure that the inverting logic function matches your circuit design needs rather than non-inverting alternatives.

Selection Notes

Select this component when designing systems requiring interface between 3.3V logic and 5V peripherals. The three-state feature is essential for shared bus applications where multiple devices must drive common lines without contention. Verify thermal performance within the specified operating temperature range for your enclosure.

Part Context

This part belongs to the 74LCX family of low-voltage CMOS logic devices. It serves as an octal buffer variant within the broader 74xx series ecosystem. The device complements non-inverting counterparts like the 74LCX244 by providing inverted signal paths for specific logic requirements.

Replacement Considerations

Check for direct pin-compatible substitutes from ON Semiconductor or other manufacturers offering the 74LCX540SJ equivalent. Ensure replacement parts maintain the same 20-SOP footprint and electrical characteristics.