DM74ALS521WMX

Comparators Overview

The DM74ALS521WMX is an advanced low-power Schottky (ALS) octal magnitude comparator manufactured by Fairchild Semiconductor. It performs an identity comparison of two 8-bit words, providing a single active-low output indicating equality. The device features expansion inputs to allow cascading for comparisons of bit widths greater than eight. It is housed in a 20-pin SOIC package and supports bidirectional data flow control via direction pins.

Comparators Feature Summary

• Performs identity comparison of two 8-bit binary words
• Provides active-low output signal when input words are equal
• Includes expansion inputs for cascading multiple units
• Supports bidirectional communication between buses

Comparators Applications

• Microprocessor systems requiring data validation
• Memory address matching circuits
• Asynchronous bidirectional data bus interfaces
• Digital logic systems needing word equality verification

Comparators Procurement Notes

Verify the component matches the specific ALS series designation and SOIC-20 package configuration. Confirm that the manufacturer source aligns with Fairchild Semiconductor specifications. Ensure the part number suffix corresponds to the correct tape-and-reel or tube packaging variant if applicable. Cross-reference the datasheet revision date to ensure compatibility with current design requirements.

Comparators Selection Notes

Select this component when an 8-bit identity comparator is required within an ALS logic family environment. Consider the bidirectional nature of the I/O ports for flexible bus integration. Evaluate the need for expansion capabilities if larger bit-width comparisons are anticipated in the system architecture.

Comparators Part Context

This part belongs to the Fairchild DM74ALS521 series of octal comparators. It is designed for use in memory and microprocessor systems where efficient, low-power comparison of digital words is necessary. The ALS technology ensures faster switching speeds compared to standard LS logic while maintaining lower power consumption.

Comparators Replacement Considerations

Direct substitutes include other DM74ALS521 variants from Fairchild or ON Semiconductor. Verify pinout compatibility and electrical characteristics before substitution.