74AC520PC

Overview

The Fairchild Semiconductor 74AC520PC is an expandable 8-bit identity comparator designed for high-speed digital applications. It compares two 8-bit words and provides a low output signal when the inputs are identical (A=B). The device operates within a supply voltage range of 2V to 6V and supports a wide operating temperature range from -40°C to +85°C. It features active-low outputs and utilizes a 20-pin PDIP package with a standard 0.300-inch width.

Feature Summary

• Expands easily to compare larger word sizes by cascading multiple units
• Provides active-low logic output indicating equality between input words
• Operates across a broad voltage spectrum from 2V to 6V

Applications

• Digital data comparison circuits
• Address decoding systems
• Error detection logic in data transmission
• Identity verification modules

Procurement Notes

Verify the specific suffix 'PC' corresponds to the 20-pin DIP package configuration. Confirm the manufacturer origin, as ON Semiconductor acquired Fairchild's semiconductor business. Check current product status, as some listings indicate this part may be obsolete or subject to last-time buy restrictions. Ensure compatibility with existing PCB footprints before procurement.

Selection Notes

Select this component when an 8-bit identity comparison function is required with active-low signaling. Consider the 2V to 6V operating range for flexibility in various logic families. Evaluate the need for expandability if comparisons beyond 8 bits are necessary. Verify that the PDIP package fits the assembly constraints and thermal requirements of the target design.

Part Context

This component belongs to the AC/ACT520 family of expandable comparators. These devices are engineered for high-speed performance and low power consumption. The AC variant typically offers higher speed compared to older LS or HC series counterparts. The family allows designers to scale comparison capabilities by connecting multiple chips together efficiently.

Replacement Considerations

Public confirmed substitute part numbers: None identified.