SN74HC688DBR

Comparators Overview

The SN74HC688DBR is an 8-bit identity comparator from Texas Instruments, housed in a 20-pin SSOP package. It compares two 8-bit binary or BCD words, outputting a logic low when inputs are identical (A=B). Operating on a 2V to 6V supply, it features active-low outputs and an output enable input. Key electrical parameters include propagation delays of 36ns at 6V and 42ns at 5V, with a maximum delay of 210ns at 2V. The device supports surface mount installation and operates within a -40°C to +85°C temperature range.

Comparators Feature Summary

• Performs 8-bit identity comparison between two binary or BCD words
• Provides active-low output signal when input values are equal
• Includes output enable input for forcing high-impedance state

Comparators Applications

• Digital data validation circuits
• Address decoding systems
• Memory address matching applications

Comparators Procurement Notes

Verify the specific package type, as SN74HC688 variants exist in SOIC, TSSOP, and SSOP configurations. Confirm RoHS compliance status through official manufacturer documentation. Ensure the selected part number matches the required pinout and thermal characteristics for the target PCB design. Cross-reference datasheet revisions for any updates to electrical specifications.

Comparators Selection Notes

Select this component for applications requiring precise equality checking of 8-bit digital words. Consider the SSOP package constraints regarding board space and thermal dissipation. Evaluate the propagation delay requirements against system clock speeds. Verify that the operating voltage range aligns with the system power supply rails.

Comparators Part Context

This device belongs to the SN74HC688 family of 8-bit identity comparators manufactured by Texas Instruments. It is part of the broader HC series of high-speed CMOS logic devices. The DBR suffix indicates the specific SSOP-20 packaging variant. This family provides reliable digital comparison functionality for standard logic applications.

Comparators Replacement Considerations

Compatible alternatives include SN74HC688DWR (SOIC-20) and SN74HC688PWRE4 (TSSOP-20), which share identical logical functions but differ in physical package dimensions. Verify pin compatibility before substitution.