SN74HC688PWTG4

Overview

The SN74HC688PWTG4 is an 8-bit identity comparator from Texas Instruments, designed to compare two 8-bit binary or BCD words. It features active-low outputs that indicate equality (A=B) when the inputs match. The device operates within a supply voltage range of 2 V to 6 V and supports surface mount installation in a TSSOP-20 package. Propagation delays are specified at 210 ns, 42 ns, and 36 ns under varying conditions. It functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Performs identity comparison of two 8-bit binary or BCD words
• Features an output-enable input to control signal states
• Provides active-low outputs for equality indication

Applications

• Digital data validation circuits
• Address decoding systems
• Control logic verification

Procurement Notes

Verify the specific suffix 'TG4' indicates lead-free and RoHS compliance status as per manufacturer documentation. Confirm the TSSOP-20 package dimensions against PCB footprint requirements. Ensure the operating voltage range aligns with system power rails. Check for any specific handling instructions regarding moisture sensitivity level during assembly processes.

Selection Notes

Select this component when 8-bit magnitude comparison is required with active-low signaling. The HC technology ensures compatibility with standard CMOS logic families. Consider the propagation delay specifications for timing-critical applications. Verify thermal performance within the specified industrial temperature range for robust operation.

Part Context

This part belongs to the SN74HC688 series of 8-bit identity comparators manufactured by Texas Instruments. It is part of the broader SNx4HCxx logic family, offering high-speed CMOS performance. The device serves as a digital comparator for verifying data integrity in electronic systems.

Replacement Considerations

SN74HC688DWRG4 offers identical functionality in a SOIC-20 package. SN74HC688PWRE4 is a compatible alternative in the same TSSOP-20 package format. Verify pinout compatibility before substitution.