CD74HC688E

Overview

The CD74HC688E is an 8-bit magnitude comparator manufactured by Texas Instruments in the HC logic family. It features a 20-pin PDIP package with active low outputs for A=B identity detection. Operating parameters include a supply voltage range of 2 V to 6 V and a maximum quiescent current of 80 uA. Propagation delays are specified at 255 ns under 50 pF load conditions. The device supports through-hole mounting and functions within a temperature range of -55 °C to +125 °C.

Feature Summary

• Performs 8-bit magnitude comparison with dedicated A=B identity output
• Utilizes high-speed CMOS technology for efficient power consumption
• Provides active low single-ended output configuration

Applications

• Digital data comparison circuits
• Address decoding systems
• Error checking logic modules

Procurement Notes

Verify the specific ordering suffix against the manufacturer datasheet to confirm package type and tape/reel specifications. Ensure the component matches the required logic family characteristics and operating temperature range for your specific application environment before finalizing procurement orders.

Selection Notes

Select this component when an 8-bit magnitude comparison function is required with through-hole packaging constraints. Consider the propagation delay specifications and supply voltage compatibility with your system design. Verify that the active low output polarity aligns with downstream logic requirements.

Part Context

This part belongs to the Texas Instruments HC series of high-speed CMOS logic devices. It serves as a digital comparator within the broader portfolio of arithmetic and logic integrated circuits designed for general-purpose computing and control applications requiring precise binary value evaluation.

Replacement Considerations

SN74HC688DWRE4 offers similar functionality in a surface-mount SOIC-20 package with different electrical timing characteristics.