MM74HC688N

Comparators Overview

The MM74HC688N is an 8-bit magnitude comparator from the 74HC series, manufactured by onsemi. It operates within a supply voltage range of 2V to 6V and features low static current consumption of 8 µA. The device provides active-low outputs indicating equality (A=B) between two 8-bit binary words. It supports propagation delays up to 30ns at 6V with 50pF load and delivers output currents of 5.2mA for both high and low states. Designed for through-hole mounting in a 20-PDIP package, it functions reliably across temperatures from -40°C to 85°C.

Comparators Feature Summary

• Performs 8-bit magnitude comparison with active-low equality output
• Operates over wide voltage range from 2V to 6V
• Low static power consumption characteristic
• Compatible with standard 74HC logic families

Comparators Applications

• Digital data comparison circuits
• Address decoding systems
• Error detection logic
• Control system input validation

Comparators Procurement Notes

This component is officially obsolete and no longer manufactured by onsemi. Procurement must focus on verified replacement parts from other manufacturers. Verify pin compatibility and electrical specifications against original datasheets before integration. Ensure substitute components meet required operating temperature and voltage ranges for your specific application environment.

Comparators Selection Notes

Select this part only if legacy compatibility is required or if existing designs utilize the 20-PDIP form factor. Due to obsolescence, prioritize alternatives with identical pinouts and electrical characteristics. Consider modern equivalents that offer improved availability while maintaining 74HC series performance standards and interface compatibility for seamless design updates.

Comparators Part Context

The MM74HC688N belongs to the widely adopted 74HC logic family, known for high-speed CMOS operation. As an 8-bit identity comparator, it compares two binary inputs to determine equality. This specific variant utilizes a 20-pin dual in-line package suitable for through-hole assembly. It serves as a fundamental building block in digital electronics for decision-making processes based on numerical value comparisons.

Comparators Replacement Considerations

Verified substitutes include CD74HC688E and SN74HC688N from Texas Instruments. These parts maintain functional equivalence and pin compatibility. Verify package dimensions and electrical parameters match original requirements before substitution.