DM74LS74ASJX

Overview

The DM74LS74ASJX is a dual positive-edge-triggered D flip-flop manufactured by Fairchild Semiconductor. It belongs to the LS logic series and features complementary outputs for each of its two independent circuits. The device operates within a supply voltage range of 4.75 V to 5.25 V, with a typical propagation delay of 27 ns at 5 V. It supports high-level output currents up to -2.6 mA and low-level currents up to 8 mA. Designed for surface-mount applications, it utilizes an SOP-II package and functions reliably across an operating temperature range of 0°C to +70°C.

Feature Summary

• Contains two independent positive-edge-triggered D flip-flops with complementary outputs
• Features asynchronous preset and clear inputs for direct state control
• Supports bidirectional data transfer via standard TTL-compatible interfaces
• Utilizes advanced low-power Schottky technology for enhanced switching speed

Applications

• Data storage and register applications in digital systems
• Shift register configurations for serial-to-parallel conversion
• Timing and synchronization circuits in microprocessor systems
• Frequency division and pulse generation modules

Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm that the specific suffix matches the requested SOP-II surface-mount package variant. Ensure compliance with RoHS directives if environmental standards are required. Cross-reference the datasheet revision date against production batches to guarantee parameter consistency. Request material certificates for critical industrial or automotive deployments.

Selection Notes

Select this component when dual independent flip-flops are required in a compact surface-mount footprint. Consider the LS series characteristics for balanced power consumption and speed. Verify that the 5V logic level compatibility aligns with the system's interface requirements. Evaluate the SOP-II package dimensions against available PCB real estate constraints before finalizing the design.

Part Context

This part is part of the widely adopted 74LS series of bipolar logic integrated circuits. It represents a standard solution for basic sequential logic operations in legacy and modern digital designs. Fairchild Semiconductor, now part of onsemi, has historically been a primary supplier of these components. The device maintains pin-out compatibility with other manufacturers' equivalents within the same logic family.

Replacement Considerations

• SN74LS74 (Texas Instruments)
• MC74LS74P (onsemi)

FAQ

How does the asynchronous clear input affect the flip-flop outputs?

A low logic level on the clear input forces both Q and Q-bar outputs to their respective defined states regardless of the clock or data inputs.

What is the significance of the complementary outputs?

The complementary outputs provide both true and inverted logic signals simultaneously, facilitating complex gate arrangements without additional inverters.