SN54ALS688J

Comparators Overview

The SN54ALS688J is an 8-bit identity/magnitude comparator manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and features active low outputs. The device exhibits a propagation delay of 20 ns and draws a maximum supply current of 19 mA. It is housed in a 20-lead ceramic dual in-line package (CDIP) designed for military-grade reliability, supporting an extended operating temperature range from -55°C to +125°C.

Comparators Feature Summary

• Provides 8-bit identity comparison functionality with magnitude output capabilities
• Features active low output polarity for direct logic interfacing
• Constructed in hermetically sealed ceramic packaging for harsh environment durability

Comparators Applications

• Military avionics systems requiring high reliability logic components
• Spacecraft data processing units operating under extreme thermal conditions
• Industrial control systems demanding wide temperature tolerance

Comparators Procurement Notes

Verify the specific suffix J indicates the ceramic CDIP package variant when sourcing. Confirm that the component meets military specifications if required for your application. Ensure compatibility with 5V logic levels given the specified supply voltage constraints. Check datasheet revisions for any updates on mechanical dimensions or electrical characteristics prior to final design integration.

Comparators Selection Notes

Select this component when military-grade environmental resilience is mandatory. The ceramic package offers superior protection against moisture and physical stress compared to plastic variants. Consider the 20 ns propagation delay for timing-critical applications within the system architecture. Evaluate power consumption limits against the 19 mA maximum supply current specification during peak operation.

Comparators Part Context

This part belongs to the SN54 series, which denotes military-grade performance standards distinct from commercial SN74 devices. The ALS technology provides advanced low-power Schottky characteristics, balancing speed and power efficiency. It serves as a specialized comparator solution for critical infrastructure where standard commercial components are insufficient due to environmental or reliability requirements.

Comparators Replacement Considerations

SN54LS688J: Compatible logic function but slower speed and different power profile. SN54ALS688: Same logic family but requires verification of package type compatibility.