74HC688DB,118

Overview

The 74HC688DB,118 is an 8-bit magnitude comparator from the Nexperia HC logic family. It performs comparisons of two 8-bit binary or BCD words. The device features clamp diodes on its inputs and operates within a supply voltage range of 2 V to 6 V. It is housed in a 20-SSOP package suitable for surface mount installation. The component supports a wide operating temperature range from -40 °C to +125 °C.

Feature Summary

• Performs direct comparison of two 8-bit binary or BCD words
• Includes input clamp diodes for protection
• Provides active low outputs indicating equality or inequality states

Applications

• Digital system monitoring
• Address decoding circuits
• Data validation logic

Procurement Notes

Verify current availability status as distribution channels may indicate limited stock or discontinuation phases. Confirm RoHS compliance details through official documentation before integration. Ensure the SSOP-20 footprint matches the target PCB design constraints. Validate electrical specifications against the specific application requirements.

Selection Notes

Select this component when an 8-bit magnitude comparison function is required within the HC logic family. The 20-SSOP package offers a compact solution for surface mount applications. Consider the 2 V to 6 V operating range for compatibility with various power supply architectures. Verify thermal performance limits for high-temperature environments.

Part Context

This part belongs to the Nexperia 74HC series of high-speed CMOS logic devices. The 74HC688 specifically functions as an 8-bit magnitude comparator. It is designed for general-purpose digital logic applications requiring reliable comparison operations. The DB suffix indicates the SSOP-20 package variant.

Replacement Considerations

Check for equivalent 8-bit comparators in the HC family from other manufacturers. Verify pinout compatibility if substituting with similar packages. Ensure logical functionality matches the original design requirements.