74109 – Dual J-K Positive-edge-triggered Flip-Flops SN74LS109AN

74LS109 Dual J-K Flip-Flop IC – TTL Logic Sequential Device
The 74LS109 is a high-speed Dual J-K Positive Edge Triggered Flip-Flop IC from the LS (Low Power Schottky) TTL logic family. Designed for sequential logic operations, timing circuits, counters, frequency division, and digital control systems, the 74LS109 provides reliable flip-flop functionality with fast switching performance and standard TTL compatibility. It is widely used in educational electronics, digital logic experiments, and classic TTL-based embedded designs.

Why it’s a System Essential:
• Dual J-K Flip-Flop Design: Integrates two independent flip-flops in a single IC package.
• Positive Edge Triggered Operation: Reliable state transition on clock rising edge.
• LS TTL Technology: Low Power Schottky family provides fast switching with lower power consumption.
• High-Speed Switching: Supports frequencies up to 35MHz for fast sequential logic applications.
• TTL Logic Compatibility: Easily interfaces with standard TTL digital systems.
• Reliable Output Drive Capability: Suitable for counters, timing circuits, and digital control systems.
• Widely Used in Digital Electronics: Common in educational, industrial, and prototyping applications.

Technical Specifications:
• Part Number: 74LS109
• Technology Family: LS (Low Power Schottky TTL)
• Device Type: Dual J-K Flip-Flop
• Number of Bits / Flip-Flops: 2
• Nominal Operating Voltage: 5V
• VCC Range:
 • Minimum: 4.75V
 • Maximum: 5.25V
• Maximum Operating Frequency: 35MHz
• Maximum Supply Current (ICC): 15mA
• Propagation Delay (tpd): 35ns (Max)
• Output Low Current (IOL): 8mA (Max)
• Output High Current (IOH): -0.4mA (Max)

Features:
• Dual positive edge-triggered J-K flip-flops
• Fast TTL switching performance
• Low power Schottky technology
• Reliable sequential logic operation
• Standard 5V TTL compatibility

Applications:
• Sequential logic circuits
• Binary counters
• Frequency divider circuits
• Timing and clock systems
• Digital state machines
• Educational electronics projects
• TTL-based digital systems
• DIY digital logic prototyping
• Industrial legacy control systems

Best For:
Ideal for students, hobbyists, makers, engineers, and electronics learners working on digital electronics, TTL logic systems, sequential logic design, counter applications, timing circuits, and educational embedded electronics projects requiring reliable J-K flip-flop functionality.