CD74HCT688M

Comparators Overview

The CD74HCT688M is an 8-bit magnitude comparator from Texas Instruments, operating within a 4.5 V to 5.5 V supply range. It features active low outputs indicating equality (A=B) between two 8-bit binary or BCD words. The device utilizes high-speed CMOS technology with propagation delays of 9 ns and 14 ns. It supports through-hole mounting in a PDIP-20 package, with a maximum supply current of 8 uA and output currents of ±4 mA. Operating temperatures span from -55°C to +125°C.

Comparators Feature Summary

• Provides active low logic output when two 8-bit inputs are identical
• Supports cascading for expanded bit comparison capabilities
• Compatible with standard LSTTL loads for fanout

Comparators Applications

• Digital systems requiring 8-bit magnitude comparison
• Cascaded multi-word identity verification circuits
• BCD code validation in control logic

Comparators Procurement Notes

Verify the specific suffix 'M' corresponds to the SOIC-20 package variant rather than the PDIP-20 version found in other listings. Confirm RoHS compliance status directly with the manufacturer datasheet. Check for obsolescence notices as some variants in this series may be scheduled for discontinuation. Ensure the ordering part number matches the required pin configuration and package type for your PCB layout.

Comparators Selection Notes

Select this component when an 8-bit identity check is required with active low signaling. The HCT input compatibility allows direct interfacing with TTL logic families. Consider the SOIC-20 surface mount package for automated assembly processes. Verify that the 4.5V to 5.5V operating voltage aligns with the system power rails. Evaluate the propagation delay specifications against the target clock speeds of the application.

Comparators Part Context

This device belongs to the CD74HCT688 family of high-speed CMOS logic comparators. It serves as a digital integrated circuit designed for precise binary word matching. The component is part of Texas Instruments' broader portfolio of logic ICs, specifically tailored for magnitude and identity comparison tasks in complex digital architectures.

Comparators Replacement Considerations

Public confirmed substitute part numbers: CD74HCT688E, CD74HC688M.