SN74HC688DWRE4

Comparators Overview

The SN74HC688DWRE4 is an 8-bit identity comparator from Texas Instruments' HC logic family, housed in a 20-pin SOIC package. It performs equality checks between two 8-bit binary or BCD words, providing an active-low output when inputs are identical (A=B). The device operates within a supply voltage range of 2 V to 6 V and supports surface-mount installation. Key electrical parameters include a maximum propagation delay of 26 ns at 6 V and 45 ns at 2 V, with a maximum supply current of 80 µA. It functions reliably across an industrial temperature range of -40 °C to +85 °C.

Comparators Feature Summary

• Performs direct equality comparison of two 8-bit binary or BCD data words
• Provides active-low output signal indicating input match status
• Includes output-enable control for bus management flexibility
• Compatible with standard CMOS logic levels for broad system integration

Comparators Applications

• Digital data validation circuits requiring word-level equality verification
• Memory address matching systems for access control
• Industrial control logic for state identification and error checking
• Communication protocol handlers for packet integrity verification

Comparators Procurement Notes

Verify the E4 suffix indicates lead-free composition and RoHS compliance per manufacturer specifications. Confirm the SOIC-20 package dimensions and pinout align with PCB footprint requirements. Ensure operating conditions remain within the specified 2 V to 6 V voltage range and -40 °C to +85 °C temperature limits for reliable performance. Cross-reference datasheet revision history for any recent parameter updates.

Comparators Selection Notes

Select this component when 8-bit identity comparison is required with low power consumption and wide voltage tolerance. The HC series offers speed suitable for general-purpose digital applications. Consider the SOIC-20 package for standard surface-mount assembly processes. Verify that the active-low output polarity matches downstream logic gate requirements without additional inversion stages.

Comparators Part Context

This part belongs to the SN74HC688 family of 8-bit identity comparators manufactured by Texas Instruments. It is part of the broader 74HC logic series, designed for high-speed CMOS operations. The device serves as a fundamental building block for digital systems needing precise data comparison capabilities, offering a balance of performance and power efficiency typical of the HC technology node.

Comparators Replacement Considerations

SN74HC688DWR is a compatible alternative within the same product line. Verify pin compatibility and electrical characteristics before substitution. Ensure the replacement maintains the same package type and logic functionality for seamless integration.