54S112DM

Overview

The 54S112DM is a military-grade, dual negative-edge-triggered master-slave J-K flip-flop manufactured by National Semiconductor. It features complementary outputs and an active-low clear input. The device utilizes Schottky TTL technology within a 14-pin ceramic dual in-line package (DIP). It operates on a nominal 5 V supply with a maximum supply current of 36 mA. Propagation delay is specified at 18 ns. The component supports an extended operating temperature range from -55 °C to 125 °C and meets MIL-STD-883 Class B screening requirements for reliability.

Feature Summary

• Dual J-K flip-flops with complementary outputs
• Negative-edge triggering mechanism
• Active-low asynchronous clear function
• Military-grade ceramic DIP packaging

Applications

• High-reliability digital counting circuits
• Frequency division networks
• Shift register construction
• State machine logic implementation

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm exact pinout, screening level, and package variant. Ensure that the procurement source provides traceable certification data compliant with MIL-STD-883 Class B requirements. Confirm that the component matches the original National Semiconductor specifications prior to integration into sensitive military or aerospace systems.

Selection Notes

Select this component when dual independent bistable memory elements are required in harsh environments. The Schottky TTL technology offers faster switching speeds compared to standard LS variants. The ceramic package provides superior thermal stability and hermetic sealing compared to plastic alternatives. Verify voltage compatibility and load requirements before finalizing the design choice.

Part Context

This part belongs to the 54Sxx series of Schottky TTL logic devices produced by National Semiconductor. The 'DM' suffix indicates a military-grade ceramic dual in-line package. This series was designed for high-speed applications requiring robust performance under extreme temperature conditions typical of defense and aerospace electronics.

Replacement Considerations

Public confirmed substitute part numbers: DM54S112J, SN54S112W.