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Product Detailed Parameters
- Description：DUAL D TYPE POSITIVE-EDGE-TRIGGE
- Series：*
- Mfr：National Semiconductor
- Package：Bulk
- Function：-
- Type：-
- Output Type：-
- Number of Elements：-
- Number of Bits per Element：-
- Clock Frequency：-
- Max Propagation Delay @ V, Max CL：-
- Trigger Type：-
- Current - Output High, Low：-
- Voltage - Supply：-
- Current - Quiescent (Iq)：-
- Operating Temperature：-
- Mounting Type：-
- Supplier Device Package：-
- Package / Case：-
- Input Capacitance：-
- Grade：-
- Qualification：-
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Overview
The JD54LS74B2A is a dual D-type flip-flop component manufactured by National Semiconductor, belonging to the military-grade 54LS series. It features two independent positive-edge-triggered D flip-flops with separate data inputs and outputs. The device operates within a strict temperature range of -55°C to +125°C, ensuring reliability in harsh environments. It utilizes standard LS-TTL logic levels and includes dedicated set and clear inputs for direct control of the output states without clock dependency.
Feature Summary
- Military-grade construction ensures operation across extreme temperature ranges
- Dual independent D-type flip-flops with positive-edge triggering
- Direct asynchronous set and clear functionality for immediate state control
Applications
- Avionics data processing systems
- Spacecraft telemetry control units
- Military communication equipment registers
Procurement Notes
Verify part authenticity through authorized distributors or manufacturer channels. Confirm that the marking matches the official National Semiconductor designation. Check for physical damage on the ceramic package leads. Ensure storage conditions comply with moisture sensitivity levels for hermetic packages. Request batch-specific test reports if required for mission-critical validation.
Selection Notes
Select this component when military-grade thermal stability is mandatory. Compare pin compatibility with existing circuit designs before integration. Verify voltage supply requirements match the system architecture. Consider package size constraints for dense PCB layouts. Evaluate long-term availability due to specialized manufacturing processes.
Part Context
This part belongs to the 54LS family, which offers faster switching speeds than standard 54-series counterparts while maintaining similar power consumption profiles. The 'J' suffix indicates a ceramic flatpack package suitable for high-reliability applications. The 'B2A' suffix typically denotes specific testing or screening criteria defined by the manufacturer for military specifications.
Replacement Considerations
Cross-reference with other manufacturers offering equivalent military-grade LS-TTL dual D flip-flops. Verify identical pinout configurations to ensure board-level compatibility. Confirm matching electrical characteristics such as propagation delay and noise margins. Check for any differences in set/clear input polarity.
