SN74LS109AN

Flip Flops Overview

The SN74LS109AN is a dual J-K positive-edge-triggered flip-flop manufactured by onsemi. It belongs to the Low Power Schottky (LS) logic family, providing two independent circuits in a 16-pin DIP package. The device features preset and clear inputs for direct control of output states. It operates within a supply voltage range of 4.75V to 5.25V, with a typical propagation delay of 40ns at 5V. The component supports TTL input and output levels, ensuring compatibility with standard digital logic systems.

Flip Flops Feature Summary

• Dual independent J-K flip-flops with positive-edge triggering
• Integrated preset and clear functions for direct state control
• Low Power Schottky technology for reduced power consumption

Flip Flops Applications

• Binary counter circuits
• Shift register implementations
• Frequency division networks

Flip Flops Procurement Notes

Verify the manufacturer marking matches onsemi specifications rather than Texas Instruments, as both produce this part number. Confirm the 'A' suffix indicates the specific variant requirements. Check RoHS compliance status against current environmental regulations. Ensure the 16-pin DIP package matches the target PCB footprint. Validate that the LS logic family meets the system's speed and power constraints.

Flip Flops Selection Notes

Select this component when dual edge-triggered storage is required in low-power applications. The LS series offers a balance between speed and power dissipation compared to standard TTL. Consider the 16-pin DIP form factor for through-hole assembly needs. Verify that the 40ns propagation delay satisfies the timing requirements of the target circuit design.

Flip Flops Part Context

This device is part of the widely adopted 74LS logic family, known for its robustness and compatibility. The SN74LS109 specifically addresses the need for dual flip-flops in a single package, reducing board space compared to using separate single flip-flop ICs. It serves as a fundamental building block for sequential logic designs in industrial and consumer electronics.

Flip Flops Replacement Considerations

SN74LS109N from Texas Instruments is a functional equivalent. SN74LS109ADRE4 from Texas Instruments offers a SOIC package alternative. MC74LS109AN from onsemi is an identical part number variant.