JD54LS74SDA

Overview

The JD54LS74SDA is a dual positive-edge-triggered D flip-flop manufactured by National Semiconductor. It features preset and clear inputs along with complementary outputs. The device operates within a supply voltage range of 4.5V to 5.5V, typically at 5V. It utilizes LS-TTL technology in a ceramic DIP-14 package. Key electrical specifications include a maximum clock frequency of 20 MHz and a maximum propagation delay of 35ns at 5V with a 50pF load.

Feature Summary

• Dual configuration containing two independent positive-edge-triggered D flip-flops
• Includes dedicated asynchronous preset and clear control inputs for state initialization
• Provides both true and complementary output signals for each flip-flop

Applications

• Digital data storage and register circuits
• Sequential logic timing control systems
• Pulse synchronization and edge detection applications

Procurement Notes

Verify the component origin carefully as National Semiconductor was acquired by Texas Instruments. Confirm that the specific JD54LS74SDA variant matches the required military or commercial grade specifications. Ensure the ceramic DIP-14 package condition is intact. Check for RoHS compliance status if required by current manufacturing standards. Validate pinout compatibility with existing circuit designs before integration.

Selection Notes

Select this component when dual D flip-flop functionality with asynchronous control is required. The LS-TTL technology ensures compatibility with standard logic families. The ceramic package offers robustness for demanding environments. Consider the 20MHz clock limit and 35ns delay for high-speed timing constraints. Verify voltage tolerance against the 4.5V to 5.5V operating range.

Part Context

This part belongs to the 54LS series of logic devices, originally designed by National Semiconductor. The 'JD' suffix indicates a ceramic dual in-line package construction. The 54LS family represents Low-power Schottky TTL technology, balancing speed and power consumption. These components are foundational in digital electronics for state retention and sequential processing tasks.

Replacement Considerations

Compatible substitutes include SN54LS74 and SN74LS74 variants from Texas Instruments. Other manufacturers may offer equivalent parts such as MC54LS74. Verify pinout and electrical characteristics match exactly. Ensure the replacement supports the same ceramic package form factor if physical constraints apply.