DM54L74J/883

Overview

The DM54L74J/883 is a dual positive-edge-triggered D flip-flop manufactured by National Semiconductor. It features independent data (D) and clear inputs for each flip-flop, with complementary Q and Q-bar outputs. The device utilizes Low-power Schottky (LS) TTL technology, ensuring reduced power consumption while maintaining high-speed performance. It is housed in a 14-pin ceramic Dual In-line Package (DIP), designed for MIL-STD-883 Class B screening. The component operates on a nominal 5 V supply, supporting a wide temperature range from -55 °C to 125 °C, making it suitable for demanding military and aerospace applications requiring reliable digital storage.

Feature Summary

• Dual configuration providing two independent positive-edge-triggered D flip-flops within a single package
• Low-power Schottky (LS) TTL technology for optimized power efficiency and speed
• Ceramic DIP construction with MIL-STD-883 Class B screening for enhanced reliability
• Independent clear input functionality allowing asynchronous reset of individual flip-flops

Applications

• Military and aerospace digital systems requiring radiation-hardened or screened components
• High-reliability data storage and shift register circuits
• Industrial control systems operating in extreme temperature environments
• Aerospace telemetry and communication equipment

Procurement Notes

Verify the specific screening level (MIL-STD-883 Class B) and lot traceability upon order confirmation. Ensure compatibility with existing MIL-spec procurement requirements. Confirm that the ceramic package and lead finish meet the project's environmental and mechanical constraints. Request full test data and certification documents from the manufacturer or authorized distributors to validate compliance with defense standards before integration into critical systems.

Selection Notes

Select this component when dual D flip-flops with low power consumption are required in harsh environments. The LS TTL family offers a balance between speed and power dissipation compared to standard TTL. The ceramic package provides superior thermal and mechanical stability over plastic alternatives. Consider the 14-pin DIP form factor for legacy socketed designs or specialized mounting requirements. Verify that the positive-edge triggering aligns with the system clock architecture.

Part Context

This part belongs to the DM54L series, representing military-grade Low-power Schottky TTL logic devices. The 'J' suffix denotes the ceramic DIP package, while '/883' indicates adherence to MIL-STD-883 testing standards. It is functionally similar to commercial variants like the DM74L74 but with stricter manufacturing controls and extended temperature ranges. The series supports complex digital logic implementations in defense and space applications where reliability is paramount.

Replacement Considerations

Direct replacements include other MIL-STD-883 screened versions of the 54L74, such as those from qualified manufacturers producing equivalent LS TTL D flip-flops in ceramic packages. Cross-reference pinouts and electrical characteristics carefully. Ensure any substitute maintains the same screening level and package dimensions. Commercial equivalents like the DM74L74 lack the necessary environmental ruggedness for direct substitution in military contexts without rigorous qualification.