74HCT688N,652

Comparators Overview

The NXP USA Inc. 74HCT688N,652 is an 8-bit magnitude comparator belonging to the HCT logic series. It operates within a supply voltage range of 4.5 V to 5.5 V and features active-low outputs for identity comparison (A=B). The device utilizes a 20-pin PDIP package and supports surface mount or through-hole installation depending on the specific variant configuration. It is designed for high-speed applications with propagation delays typically ranging from 17 ns to 34 ns under standard test conditions.

Comparators Feature Summary

• Performs 8-bit magnitude comparison operations with dedicated identity output
• Compatible with low power Schottky TTL (LSTTL) logic levels
• Features active-low output signals for direct interface compatibility

Comparators Applications

• Digital data validation circuits requiring equality checks
• Address decoding systems in microprocessor interfaces
• Error detection logic in data transmission pathways

Comparators Procurement Notes

Verify the exact suffix and package type when ordering, as availability varies by region. Confirm RoHS compliance status directly with the manufacturer or authorized distributor. Ensure the selected variant matches the required pin count and mounting style for your PCB design. Check for end-of-life notices or obsolescence warnings before finalizing procurement plans.

Comparators Selection Notes

Select this component when an 8-bit identity comparator is required within a 5V logic system. The HCT series ensures compatibility with standard TTL inputs while offering CMOS noise immunity. Consider the 20-pin DIP package for prototyping or legacy board replacements. Verify that the operating temperature range meets your environmental requirements.

Comparators Part Context

This part belongs to the 74HC/HCT688 family of high-speed Si-gate CMOS devices. These comparators are pin-compatible with low power Schottky TTL standards. The series provides reliable performance for digital comparison tasks in industrial and consumer electronics applications.

Comparators Replacement Considerations

Equivalent parts include the 74HC688PW-T for surface mount applications. Verify pinout compatibility and electrical specifications before substitution. Ensure the replacement maintains the same logic family voltage requirements.