M74HC688B1R

Comparators Overview

The M74HC688B1R is an 8-bit equality comparator from the STMicroelectronics 74HC series, housed in a 20-DIP package. It operates on a supply voltage range of 2 V to 6 V and features active-low outputs indicating when input A equals input B. The device supports a wide operating temperature range from -55 °C to +125 °C with a maximum propagation delay of 29 ns at 6 V and 50 pF load.

Comparators Feature Summary

• Performs 8-bit magnitude comparison with active-low output assertion for equality conditions
• Compatible with standard CMOS logic families within specified voltage limits
• Designed for through-hole mounting in industrial-grade temperature environments

Comparators Applications

• Digital system data validation circuits
• Address decoding networks
• Comparator-based control logic

Comparators Procurement Notes

Verify component status as this part may be obsolete or discontinued. Confirm pinout compatibility with legacy designs before integration. Check current manufacturer availability channels for replacement options or last-time buy notifications. Ensure datasheet revisions match design requirements.

Comparators Selection Notes

Select this component for applications requiring precise 8-bit equality detection in through-hole assemblies. Consider the 74HC series speed and voltage characteristics against system requirements. Evaluate alternative packages if surface-mount solutions are preferred for new designs.

Comparators Part Context

This part belongs to the 74HC family of high-speed CMOS logic devices produced by STMicroelectronics. The 74HC688 specifically functions as an identity comparator, distinguishing itself from shift registers or buffers found in other series members like the M74HC164 or M74HC368.

Comparators Replacement Considerations

• M74HC688TTR
• M74HC688RM13TR