CD74HCT688EG4

Comparators Overview

The CD74HCT688EG4 is an 8-bit magnitude comparator from Texas Instruments, housed in a 20-pin PDIP package. It operates on a supply voltage range of 4.5V to 5.5V with a maximum quiescent current of 8µA. The device features active-low outputs and supports through-hole mounting. Propagation delays are specified at 9ns and 14ns under standard conditions, while maximum delay reaches 34ns at 4.5V with 50pF load. Operating temperatures span from -55°C to +125°C.

Comparators Feature Summary

• Provides identity comparison functionality for 8-bit digital inputs
• Compatible with LSTTL logic loads for standard and bus driver applications
• Capable of cascading for expanded bit-width comparisons

Comparators Applications

• Digital magnitude comparison circuits
• Identity verification systems
• Cascaded multi-bit comparator arrays

Comparators Procurement Notes

Verify the specific suffix 'G4' indicates lead-free compliance and RoHS adherence as per Texas Instruments documentation. Confirm the 20-PDIP package style matches your PCB footprint requirements. Ensure operating voltage constraints between 4.5V and 5.5V align with your system power rails before integration.

Comparators Selection Notes

Select this component when high-speed CMOS performance is required alongside LSTTL compatibility. The 8-bit width suits direct byte-level comparisons without additional logic gates. Consider the PDIP-20 package for prototyping or through-hole manufacturing needs where surface mount options are unsuitable.

Comparators Part Context

This part belongs to the CD74HCT688 family of high-speed CMOS logic comparators. It serves as a specialized integrated circuit for determining equality between two binary numbers. The HCT technology ensures compatibility with standard TTL logic levels while maintaining low power consumption characteristics typical of CMOS devices.

Comparators Replacement Considerations

The CD74HCT688E is the non-green equivalent variant. Verify if lead-free compliance is mandatory for your assembly process. Both parts share identical electrical specifications and pinouts, allowing for direct substitution if environmental regulations permit.