74ACT520SCX

Overview

The onsemi 74ACT520SCX is an octal identity comparator housed in a 20-SOIC package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports surface-mount installation. The device features eight-bit parallel comparison with low-active outputs indicating equality between input pairs. It exhibits a propagation delay of 9 ns at 5 V, with high-level output current of -24 mA and low-level output current of 24 mA. Static current is specified at 4 µA, while operating supply current reaches 40 µA. The component functions reliably across temperatures from -40°C to +85°C.

Feature Summary

• Performs parallel identity comparison for eight-bit data words
• Provides low-active logic output when input pairs are identical
• Features three-state outputs for bus-oriented system integration

Applications

• Data integrity verification in digital communication systems
• Memory address matching circuits
• Parallel data validation modules

Procurement Notes

Verify the specific suffix 'SCX' against the manufacturer's official datasheet to confirm pinout compatibility and electrical characteristics. Ensure the procurement source provides valid RoHS compliance documentation. Confirm that the supplier handles moisture-sensitive devices appropriately, as indicated by the component's sensitivity classification. Validate that the delivered units match the exact part number to avoid functional mismatches in critical logic applications.

Selection Notes

Select this component when designing systems requiring precise parallel data comparison without inversion. The ACT series offers CMOS speed advantages over standard TTL equivalents. Consider the 20-SOIC package dimensions for PCB layout constraints. Evaluate the 9 ns propagation delay against system clock requirements to ensure timing margins are sufficient for the intended application frequency.

Part Context

This component belongs to the 74ACT logic family, which combines CMOS low power consumption with TTL-compatible speeds. The 74ACT520 specifically addresses identity comparison needs, distinguishing it from buffers or decoders in the same series. It serves as a specialized logic gate for verifying data consistency in microprocessor-based architectures.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.