SN74LS109 Dual J-Kbar Positive-Edge-Triggered Flip-Flop with Preset and Clear – 16-Pin DIP

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SCIx5975
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The SN74LS109 is a specialized dual flip-flop that provides high-speed logic and versatile control options. Its defining characteristic is the J-Kbar input configuration. In a standard J-K flip-flop, you must pull both pins high to toggle; in the 74LS109, you pull J high and Kbar low to achieve the same result. This makes the chip particularly useful for interfacing with sensors or logic gates that output inverted signals. This IC is a staple in sequential logic design, used for building counters, shift registers, and synchronization circuits. Because it includes both Preset and Clear inputs, it is incredibly easy to "start" a system at a known state (either 0 or 1). Its positive-edge triggering ensures that the output only changes when the clock signal transitions from low to high, preventing accidental triggers from unstable signals. The 16-pin DIP through-hole package is rugged and industry-standard, making it perfect for repairing legacy computer hardware, building educational logic trainers, or designing custom industrial timing controllers. Whether you need a simple toggle switch or a complex frequency divider, the SN74LS109 offers a professional and robust logic solution.

Key Features:

  • Unique J-Kbar Logic Unlike standard J-K flip-flops, the second input is active-low (Kbar). This allows the chip to act as a D-type flip-flop by simply tying the J and Kbar inputs together.
  • Positive-Edge Triggering Data is transferred from the inputs to the outputs on the rising edge of the clock pulse, ensuring high timing precision.
  • Direct Preset and Clear Inputs Features asynchronous active-low Set and Reset pins that override the clock, allowing for immediate initialization of the flip-flop state.
  • Low-Power Schottky (LS) Technology Offers a professional balance between high-speed switching and low power consumption for 5V systems.
  • High Noise Immunity Specifically designed to maintain stable logic states in environments with electrical noise, such as industrial control panels.
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