SN74LS85N

Overview

The SN74LS85N is a four-bit magnitude comparator manufactured by Texas Instruments in the 74LS logic family. It performs comparisons of straight binary and BCD codes, providing three fully decoded outputs indicating whether input A is less than, equal to, or greater than input B. The device operates within a supply voltage range of 4.75 V to 5.25 V, with a maximum power supply current of 20 mA. Propagation delays are specified at 24 ns and 27 ns. It is housed in a 16-pin PDIP package and supports through-hole mounting for industrial temperature ranges from 0°C to +70°C.

Feature Summary

• Provides three fully decoded decision outputs for magnitude comparison
• Supports both straight binary and straight BCD code formats
• Features active high output types for direct interfacing

Applications

• Digital magnitude comparison circuits
• BCD code processing systems
• Binary arithmetic logic units

Procurement Notes

Verify the specific manufacturer datasheet for the SN74LS85N to confirm pinout compatibility and electrical characteristics against your design requirements. Ensure the procurement source provides original Texas Instruments components to guarantee adherence to the specified 74LS family performance standards and packaging integrity.

Selection Notes

Select this component when a dedicated four-bit magnitude comparator is required for binary or BCD operations. The 74LS technology offers a balance of speed and power consumption suitable for general digital logic applications. Consider the 16-pin DIP package constraints for PCB layout and ensure the operating environment remains within the specified commercial temperature limits.

Part Context

This part belongs to the Texas Instruments 74LS series, which utilizes Low-power Schottky technology. The SN74LS85N specifically addresses the need for multi-bit comparison functions without requiring external decoding logic. It serves as a fundamental building block in digital systems where relative value determination between two four-bit operands is necessary.

Replacement Considerations

Check for SN74LS85 equivalents from other manufacturers such as ON Semiconductor, ensuring identical pinouts and logical functionality. Verify that substitute parts maintain the same 4.75V to 5.25V operating voltage range and propagation delay specifications.