M74HC688TTR

Comparators Overview

The M74HC688TTR is an 8-bit identity comparator from the STMicroelectronics 74HC logic family, housed in a 20-TSSOP surface-mount package. It operates within a supply voltage range of 2V to 6V and features low quiescent current of 4µA. The device provides active-low outputs indicating equality between two 8-bit binary words. It supports output drive currents of 5.2mA for both high and low states, with a maximum propagation delay of 29ns at 6V with 50pF load. Operating temperatures span from -55°C to +125°C.

Comparators Feature Summary

• Performs parallel comparison of two 8-bit digital inputs
• Provides active-low output signal when input data sets are identical
• Features three-state compatible outputs for bus interfacing

Comparators Applications

• Address decoding in memory systems
• Data validation circuits
• Control logic for equality checking

Comparators Procurement Notes

Verify component authenticity through authorized channels as this part may be obsolete. Confirm package integrity and moisture sensitivity handling requirements prior to assembly. Cross-reference datasheet revisions to ensure parameter compatibility with existing designs. Check for available replacement components if long-term supply is required.

Comparators Selection Notes

Select this component for applications requiring precise 8-bit data matching with minimal power consumption. Ensure operating voltage remains within the specified 2V to 6V range. Consider the 29ns propagation delay for timing constraints in high-speed digital interfaces. Verify thermal management capabilities for operation up to 125°C ambient temperature.

Comparators Part Context

This integrated circuit belongs to the standard 74HC series of CMOS logic devices, widely used in general-purpose digital electronics. The TTR suffix indicates tape-and-reel packaging suitable for automated surface-mount assembly processes. As an identity comparator, it serves fundamental roles in digital system control and data processing architectures.

Comparators Replacement Considerations

Check manufacturer documentation for direct pin-compatible alternatives. Verify that substitute components maintain identical 8-bit comparison functionality and active-low output polarity. Ensure electrical parameters such as supply voltage range and propagation delay meet original design specifications.