M74HCT688B1R

Comparators Overview

The M74HCT688B1R is an 8-bit equality comparator from STMicroelectronics, designed for high-speed digital logic applications. It operates within a supply voltage range of 2V to 6V and features low quiescent current of 4µA. The device supports through-hole mounting in a 20-DIP package with a maximum propagation delay of 29ns at 6V with 50pF load. It functions across an extended temperature range from -55°C to +125°C, ensuring reliable performance in industrial environments.

Comparators Feature Summary

• Provides eight-bit parallel data comparison to determine equality between two input words
• Features low power consumption with minimal static current draw during operation
• Supports wide operating voltage ranges compatible with standard CMOS logic families

Comparators Applications

• Digital address decoding systems requiring precise bit matching
• Data validation circuits in microprocessor-based control units
• Equality checking modules in automated test equipment

Comparators Procurement Notes

Verify component authenticity through authorized distributors due to discontinued status. Confirm RoHS compliance documentation matches specific manufacturing lot requirements. Ensure packaging integrity remains intact for DIP-20 through-hole installation. Cross-reference datasheet revisions to confirm pinout consistency with existing design schematics before final procurement decisions.

Comparators Selection Notes

Select this comparator when eight-bit parallel equality detection is required within standard HC/HCT logic voltage constraints. Consider the 29ns propagation delay for timing-sensitive paths. Evaluate thermal management needs given the extended temperature range capability. Verify that the 20-DIP package fits available PCB real estate and mounting constraints compared to surface-mount alternatives.

Comparators Part Context

This component belongs to the M74HCT series of logic comparators manufactured by STMicroelectronics. It serves as a specialized integrated circuit for digital signal processing tasks where binary data equivalence must be determined rapidly. The part represents a transition between older HC technology and modern HCT compatibility standards.

Comparators Replacement Considerations

Public confirmed substitute part numbers are not available in verified sources. Designers should evaluate generic 8-bit equality comparators from other manufacturers only after confirming electrical parameter compatibility and pin-to-pin correspondence.