SN74F521DWR

Overview

The SN74F521DWR is an octal binary/BCD identity comparator manufactured by Texas Instruments in a 20-pin SOIC package. It performs logic comparison where outputs indicate if input A equals input B. Key electrical parameters include a propagation delay of 4.6 ns, 6.1 ns, and 6.6 ns. The device operates within a supply voltage range of 4.5 V to 5.5 V with a maximum power supply current of 32 mA. Operating temperatures range from 0°C to +70°C.

Feature Summary

• Octal binary and BCD identity comparison functionality
• Active low output indicators for equality conditions
• Enable input control for operational gating

Applications

• Digital data path validation
• Memory address matching circuits
• Control logic verification systems

Procurement Notes

Verify the specific suffix 'DWR' corresponds to the tape and reel packaging format required for automated assembly processes. Confirm that the 20-SOIC body dimensions align with the target PCB footprint specifications. Ensure the commercial temperature grade meets the environmental operating requirements of the final system design before procurement.

Selection Notes

Select this component when octal parallel data equality checking is required within standard TTL-compatible voltage levels. The active low outputs simplify interface connections to subsequent logic stages. Consider the propagation delay characteristics relative to system clock speeds to ensure timing margins are sufficient for the intended application frequency.

Part Context

This part belongs to the Texas Instruments SN74F series of logic comparators. It provides eight-bit identity comparison capabilities using standard Schottky technology. The device is designed for high-speed digital applications requiring reliable equality detection between two eight-bit data words or BCD codes.

Replacement Considerations

The SN74ALS521DWR serves as a functional alternative within the same package, offering different speed and power characteristics. Verify pin compatibility and logic level tolerances when substituting with other octal comparators from the SN74 family.