74HCT688D,652

Comparators Overview

The NXP USA Inc. 74HCT688D,652 is an 8-bit magnitude comparator from the 74HCT logic family, housed in a 20-pin SOIC package. It functions as an identity comparator with active low outputs indicating equality (A=B). The device operates within a supply voltage range of 2 V to 6 V and supports a wide operating temperature range from -40 °C to +125 °C. Propagation delays are specified at 170 ns, 34 ns, and 29 ns under varying conditions, with a maximum supply current of 8 µA.

Comparators Feature Summary

• Provides 8-bit magnitude comparison functionality with active low output signals for equality detection.
• Features high-speed Si-gate CMOS technology compatible with low power Schottky TTL (LSTTL) pinouts.
• Operates across an extended industrial temperature range suitable for demanding environments.

Comparators Applications

• Digital data validation circuits
• Address decoding systems
• Error checking modules

Comparators Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and specific packaging variants such as tube quantities. Ensure the part number suffix matches required specifications. Check for lifecycle status updates as availability may vary by region.

Comparators Selection Notes

Select this component when 8-bit equality comparison is required with HCT logic level compatibility. Consider the 20-pin SOIC package for surface mount applications. Evaluate propagation delay requirements against the specified 170 ns, 34 ns, and 29 ns values. Ensure supply voltage constraints align with the 2 V to 6 V operational range.

Comparators Part Context

This part belongs to the 74HC/HCT688 series of high-speed CMOS logic comparators. It is designed for general-purpose digital applications requiring reliable magnitude comparison. The device integrates multiple comparison functions into a single IC, reducing board space compared to discrete solutions.

Comparators Replacement Considerations

The 74HCT688D,652 is functionally equivalent to other 74HCT688 variants such as 74HCT688DB,118 and 74HCT688PW,112. Verify package compatibility and electrical parameters before substitution.