54S74DM

Overview

The DM54S74 is a dual negative-edge-triggered master-slave J-K flip-flop manufactured by National Semiconductor. It features independent clear and complementary outputs for each flip-flop. The device operates on a single 5 V supply with a maximum power dissipation of 8 mA. It utilizes LS-TTL logic technology within a 14-pin ceramic DIP package, supporting an extended industrial temperature range from -55 °C to 125 °C. The component meets MIL-STD-883 Class C screening standards.

Feature Summary

• Dual configuration containing two independent J-K flip-flops
• Negative-edge-triggered master-slave architecture
• Integrated clear input and complementary output terminals
• Military-grade ceramic packaging for high reliability

Applications

• High-reliability military aerospace digital systems
• Industrial control logic requiring wide temperature stability
• Data storage registers in harsh environments
• Frequency division circuits in defense electronics

Procurement Notes

Verify the specific suffix indicates the correct screening level and material composition. Confirm that the ceramic package matches the required environmental specifications. Ensure the supplier provides traceable documentation for MIL-STD-883 compliance. Check for any lead-free or RoHS exemptions if applicable to the production era. Validate the authenticity of the National Semiconductor markings against known counterfeits.

Selection Notes

Select this component when military-grade durability and wide temperature operation are mandatory. Choose over plastic variants if hermetic sealing is required for extreme conditions. Consider the LS-TTL speed characteristics against system timing requirements. Evaluate the 14-pin DIP footprint against available board space constraints.

Part Context

This part belongs to the DM54 series of high-performance logic devices designed for military applications. It shares functional similarities with the DM54LS73 but offers different speed and power trade-offs inherent to the S-TTL family. The series supports complex state machine implementations in demanding electronic environments.

Replacement Considerations

The DM54LS73J/883C serves as a verified substitute offering identical logical functionality and similar military screening levels. Cross-reference pinouts and electrical characteristics to ensure compatibility with existing circuit designs before implementation.