DM74ALS521WM

Comparators Overview

The DM74ALS521WM is an 8-bit identity comparator from the 74ALS series, manufactured by Fairchild Semiconductor. It performs an 'equal to' comparison of two 8-bit words, providing an active low output when inputs match. The device operates within a supply voltage range of 4.5V to 5.5V. Key electrical parameters include a maximum propagation delay of 20ns at 5V with 50pF load and absolute propagation delay of 22ns. Output currents are specified as -2.6mA for high level and 24mA for low level. It is housed in a 20-SOIC package.

Comparators Feature Summary

• Performs identity comparison of two 8-bit data words
• Provides active low output signal upon input equality
• Supports expansion capabilities and external enabling functions

Comparators Applications

• Digital systems requiring word-level equality verification
• Memory address matching circuits
• Microprocessor interface logic for status checking

Comparators Procurement Notes

Verify the manufacturer marking matches Fairchild or ON Semiconductor specifications. Confirm the 20-SOIC package dimensions align with MS-013 standards. Ensure the component meets the required operating temperature range of 0°C to 70°C. Check for RoHS compliance if environmental regulations apply. Validate that the part number suffix corresponds to the tube packaging format.

Comparators Selection Notes

Select this component when an 8-bit identity comparison function is required in advanced low-power Schottky logic designs. Consider the 20-pin SOIC footprint for board layout compatibility. Evaluate the 20ns propagation delay against system timing requirements. Ensure the active low output polarity suits the downstream logic inputs. Verify power supply stability within the 4.5V to 5.5V range for optimal performance.

Comparators Part Context

This device belongs to the 74ALS logic family, known for advanced low-power Schottky technology. It serves as a specialized comparator within digital integrated circuits. The 8-bit configuration allows for comprehensive word comparison tasks. The design supports integration into larger digital systems requiring precise data validation.

Comparators Replacement Considerations

Check for compatible 8-bit identity comparators in the 74ALS series. Verify pinout compatibility for direct substitution. Ensure equivalent electrical characteristics such as propagation delay and output current. Confirm package type matches the existing PCB footprint.