74LS85PC

Comparators Overview

The National Semiconductor 74LS85PC is a 4-bit magnitude comparator housed in a 16-DIP package. It compares two 4-bit words (A and B) with active high outputs indicating A<B, A=B, or A>B relationships. The device operates within a supply voltage range of 4.75V to 5.25V and supports an operating temperature range of 0°C to 70°C. Key electrical specifications include a maximum quiescent current of 20 mA and a propagation delay of 45ns at 5V with a 15pF load.

Comparators Feature Summary

• Performs parallel comparison of two 4-bit binary or BCD words
• Provides distinct active high outputs for less than, equal, and greater than conditions
• Supports cascading expansion for multi-bit magnitude comparisons

Comparators Applications

• Binary data comparison circuits
• BCD code validation systems
• Digital control logic requiring magnitude decision making

Comparators Procurement Notes

Verify the manufacturer origin carefully, as National Semiconductor assets were acquired by Texas Instruments. Confirm the specific suffix 'PC' corresponds to the requested 16-pin DIP package and lead-free status if required. Check datasheet revisions from ON Semiconductor or TI archives to ensure pinout and electrical characteristics match your design requirements exactly.

Comparators Selection Notes

Select this component when a dedicated 4-bit magnitude comparison function is needed within standard TTL logic families. Ensure the system operates within the specified 0°C to 70°C temperature range and that the 20mA quiescent current draw is acceptable for the power budget. Verify compatibility with existing 5V logic levels and input/output voltage thresholds.

Comparators Part Context

This part belongs to the 74LS series of low-power Schottky logic devices. It serves as a fundamental building block for arithmetic logic units and digital comparators. The 74LS85 family is widely recognized for its ability to handle monotonic codes beyond standard binary, offering flexibility in digital signal processing applications.

Comparators Replacement Considerations

Equivalent parts include DM74LS85N and SN74LS85. Verify pin compatibility and electrical specs before substitution.