40085BDM

Overview

The Fairchild Semiconductor 40085BDM is a 4-bit magnitude comparator integrated circuit housed in a 16-lead Ceramic Dual In-Line Package (CDIP). It provides three distinct outputs to indicate the relationship between two 4-bit binary inputs: A less than B, A equal to B, and A greater than B. The device features high-level valid outputs, ensuring clear logic state representation for digital comparison applications.

Feature Summary

• Provides simultaneous indication of A<B, A=B, and A>B conditions
• High-level valid output configuration for direct logic interfacing
• Designed for 4-bit binary magnitude comparison operations

Applications

• Digital arithmetic logic units requiring magnitude determination
• Control systems comparing setpoints against measured values
• Address decoding circuits in microprocessor-based designs

Procurement Notes

Verify the manufacturer part number 40085BDM against official Fairchild Semiconductor documentation to confirm the 16-CDIP package and 4-bit comparator functionality. Ensure compatibility with existing ceramic DIP footprints and voltage levels specified in the datasheet before integration into production assemblies.

Selection Notes

Select this component when a dedicated hardware solution for 4-bit magnitude comparison is required within a system utilizing ceramic dual in-line packaging constraints. Consider the specific output logic polarity and propagation delay characteristics defined in the electrical specifications relative to the target application speed requirements.

Part Context

This component belongs to the family of discrete digital logic comparators manufactured by Fairchild Semiconductor. It serves as a fundamental building block for digital decision-making circuits, offering a fixed-function alternative to programmable logic devices for simple binary value comparisons in embedded systems.

Replacement Considerations

Consult official substitution guides for equivalent 4-bit magnitude comparators in CDIP packages. Verify pinout compatibility and logical function equivalence before replacing the original Fairchild part with alternatives from other manufacturers.