74HC688D,652

Overview

The 74HC688D,652 is an 8-bit magnitude comparator from the Nexperia 74HC series. It compares two 8-bit binary or BCD words and provides active-low outputs indicating equality (A=B). The device operates within a wide supply voltage range of 2.0 V to 6.0 V. It features CMOS input levels, low power dissipation, and high noise immunity. The component includes clamp diodes on inputs for interfacing with voltages exceeding VCC via current-limiting resistors. It complies with JEDEC standards JESD8C and JESD7A.

Feature Summary

• Performs comparison of two 8-bit binary or BCD words
• Provides active-low output for A=B condition
• Includes input clamp diodes for extended voltage interfacing
• Complies with JEDEC JESD8C and JESD7A standards

Applications

• Digital system data comparison
• BCD code validation circuits
• Magnitude detection in control logic

Procurement Notes

Verify availability status as distributors list this part as obsolete or no longer manufactured. Confirm if alternative package types or substitute components are required for new designs. Check official Nexperia longevity program documentation for end-of-life timelines. Ensure sourcing channels provide genuine components with valid traceability records.

Selection Notes

Select this component for applications requiring 8-bit magnitude comparison within the 74HC logic family. Consider the SOIC-20 package constraints and operating temperature ranges. Evaluate compatibility with existing 2.0 V to 6.0 V supply rails. Assess noise immunity requirements against specified latch-up performance levels.

Part Context

This component belongs to the 74HC series of high-speed CMOS logic devices. It functions specifically as a magnitude comparator rather than a general-purpose gate or flip-flop. The device is designed for digital logic applications requiring precise word comparison capabilities within standard industrial temperature ranges.

Replacement Considerations

Distributors indicate this product is no longer manufactured. Review available substitutes or alternative package types listed by suppliers. Verify functional equivalence of replacement parts for 8-bit comparison tasks.