CD74HC688PW

Comparators Overview

The CD74HC688PW is an 8-bit identity comparator manufactured by Texas Instruments, designed for high-speed CMOS logic applications. It performs comparisons of two 8-bit binary or BCD words, asserting an active-low output when the inputs are equal (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 +85°C. Key electrical characteristics include propagation delays of 210 ns, 42 ns, and 36 ns under varying conditions. Packaged in a 20-TSSOP surface-mount format, it includes an output-enable input to control signal transmission.

Comparators Feature Summary

• Performs identity comparison between two 8-bit digital words
• Provides active-low output indication for equality detection
• Includes dedicated output-enable input for signal control

Comparators Applications

• Digital system data validation
• Memory address matching circuits
• Control logic equality verification

Comparators Procurement Notes

Verify the specific suffix 'PW' confirms the TSSOP-20 package variant during sourcing. Ensure compatibility with the required 2 V to 6 V supply rails and -40°C to +85°C industrial temperature range. Confirm RoHS compliance status matches project environmental requirements. Cross-reference the manufacturer part number against official Texas Instruments documentation to avoid counterfeit components.

Comparators Selection Notes

Select this component when an 8-bit identity comparison function is required within standard CMOS logic families. The TSSOP-20 package suits space-constrained surface-mount designs. Consider the specified propagation delays and supply voltage limits relative to system timing and power constraints. Verify that the active-low output polarity aligns with downstream logic gate requirements.

Comparators Part Context

This part belongs to the SN74HC688 series of 8-bit identity comparators. It shares functional similarities with variants like SN74HC688DWRG4 but differs in packaging, utilizing a TSSOP-20 form factor instead of SOIC-20. The series is characterized by high-speed CMOS technology suitable for general-purpose digital logic applications requiring precise equality detection.

Comparators Replacement Considerations

SN74HC688PWRE4 serves as a direct equivalent with identical functionality and TSSOP-20 packaging. SN74HC688DWRG4 offers comparable performance but utilizes an SOIC-20 package, requiring footprint adaptation.