74HC688PW,118

Overview

The 74HC688PW,118 is an 8-bit CMOS magnitude comparator manufactured by Nexperia USA Inc. It performs comparison of two 8-bit binary or BCD words and is pin compatible with low power Schottky TTL (LSTTL). The device operates within a supply voltage range of 2V to 6V and features active low outputs indicating equality (A=B). It is housed in a 20-TSSOP package with dimensions of 0.173 inches (4.40mm) width. The component supports a wide operating temperature range from -40°C to 125°C.

Feature Summary

• Performs direct comparison of two 8-bit binary or BCD words
• Pin compatible with low power Schottky TTL (LSTTL)
• Provides active low output signal when input values are equal

Applications

• Digital magnitude comparison circuits
• Binary coded decimal (BCD) processing systems
• Logic control applications requiring identity verification

Procurement Notes

Verify the specific suffix '118' corresponds to the standard tape and reel packaging configuration as defined by Nexperia. Confirm that the 20-TSSOP footprint matches the target PCB design constraints. Ensure the operating voltage requirements align with the 2V to 6V specification for reliable performance in the intended application environment.

Selection Notes

Select this component when an 8-bit magnitude comparison function is required with LSTTL pin compatibility. It is suitable for designs needing active low equality detection for binary or BCD data. Consider the 20-TSSOP package size for surface mount assembly constraints. Verify that the 2V to 6V supply range meets the system power architecture requirements.

Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices. It serves as a digital comparator within the broader family of Nexperia logic integrated circuits. The device provides a standardized solution for comparing two 8-bit digital inputs, offering a compact alternative to discrete comparator implementations in mixed-signal or digital logic environments.

Replacement Considerations

Direct replacements must maintain 8-bit magnitude comparison functionality and LSTTL pin compatibility. Verify that any substitute component supports the same 20-TSSOP package and operates within the 2V to 6V supply range. Ensure the replacement offers equivalent active low output characteristics for A=B detection.