SN54LS688J

Comparators Overview

The SN54LS688J is an 8-bit identity/magnitude comparator manufactured by Texas Instruments. It operates within a supply voltage range of 4.75V to 5.25V and features a typical propagation delay of 30ns at 5V. The device functions across an extended temperature range from -55°C to 125°C. It utilizes a 20-pin Ceramic Dual In-line Package (CDIP) with glass-sealed construction, suitable for high-reliability military applications.

Comparators Feature Summary

• Provides simultaneous A=B, A>B, and A<B output indications for 8-bit magnitude comparison
• Features internal pull-up resistors on B inputs to simplify circuit design
• Includes an enable input to control comparator operation
• Constructed with ceramic package for enhanced environmental stability

Comparators Applications

• Military-grade data processing systems requiring high reliability
• Industrial control logic involving magnitude verification
• Aerospace instrumentation for signal comparison tasks

Comparators Procurement Notes

Verify the specific ordering suffix J confirms the CDIP package and ceramic construction. Ensure compatibility with existing board layouts designed for 20-pin dual in-line configurations. Confirm that the extended temperature rating meets the operational requirements of the target environment. Check for any specific handling instructions related to ceramic packages during assembly.

Comparators Selection Notes

Select this component when 8-bit magnitude comparison is required in harsh environments. The LS series offers standard speed suitable for general logic applications. Consider the ceramic package for superior thermal and mechanical performance compared to plastic alternatives. Verify power supply constraints align with the 5V nominal requirement.

Comparators Part Context

This part belongs to the SN54LS688 family of 8-bit comparators. The SN54 series denotes military-grade specifications, including wider temperature ranges and stricter manufacturing controls. It complements other LS logic devices in complex digital systems requiring precise numerical comparison capabilities.

Comparators Replacement Considerations

SN54LS688 is the non-package-specific equivalent. SN54LS688N serves as a plastic DIP alternative if packaging differences are acceptable. Verify pinout compatibility before substitution.