CD74HC688NS

Comparators Overview

The CD74HC688NS is an 8-bit magnitude comparator from Texas Instruments, housed in a 20-pin SOIC package. It performs identity logic functions where the output indicates if input A equals input B. The device features active low outputs and operates within a supply voltage range of 2 V to 6 V. Propagation delays are specified at 36 ns, 42 ns, and 210 ns depending on load conditions. It supports surface mount installation with a wide operating temperature range from -40°C to +85°C.

Comparators Feature Summary

• Performs 8-bit magnitude comparison with active low output indication for equality
• Utilizes high-speed CMOS technology for efficient power consumption
• Supports surface mount installation in compact 20-pin SOIC packaging

Comparators Applications

• Power supply monitoring circuits
• Motor drive fault detection systems
• Handheld test instruments requiring threshold alerts

Comparators Procurement Notes

Verify the specific suffix 'NS' confirms the standard SOIC-20 package and commercial temperature grade when sourcing. Ensure compatibility with existing PCB footprints designed for this 20-pin surface mount form factor. Confirm that the active low output polarity aligns with the target circuit design requirements before finalizing procurement orders.

Comparators Selection Notes

Select this component when an 8-bit identity check is required in space-constrained designs. The SOIC-20 package offers a balance between pin count and board area. Consider the propagation delay specifications relative to system clock speeds. Verify that the 2V to 6V supply range matches the available power rails in the application environment.

Comparators Part Context

This part belongs to the SN74HC/CD74HC series of high-speed CMOS logic devices manufactured by Texas Instruments. The HC series provides compatible functionality with standard TTL logic levels while offering improved speed and lower power dissipation characteristics compared to older NMOS technologies.

Comparators Replacement Considerations

• SN74HC688DWR
• SN74HC688PWRE4

Comparators FAQ

What is the logic function of the CD74HC688NS?

It acts as an 8-bit magnitude comparator that outputs a signal indicating whether two 8-bit binary inputs are equal (A = B).

What type of output does this comparator provide?

The device provides an active low output, meaning the output goes low when the inputs are equal.