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Dual J-K Positive Edge-Triggered Flip-Flop IC - 74HC109

Dual J-K Positive Edge-Triggered Flip-Flop IC - 74HC109

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  • Product: Positive Edge Triggered Dual J-K Flip-Flop IC
  • IC number: 74109
  • No of pins: 16
  • Package: PDIP-16
  • Mounting type: through hole

Dual J-K Positive Edge-Triggered Flip-Flop IC - 74HC109

The 74HC Series 74HC109 IC devices contain two independent J-K positive-edge-triggered flip-flops. A low level at the preset or clear inputs sets or resets the outputs regardless of the levels of the other inputs. When preset and clear are inactive (high), data at the J and K inputs meeting the setup time requirements are transferred to the outputs on the positive-going edge of the clock pulse.

Clock triggering occurs at a voltage level and is not directly related to the rise time of the clock pulse. Following the hold-time interval, data at the J and K inputs may be changed without affecting the levels at the outputs. These versatile flip-flops can perform as toggle flip-flops by grounding K and tying J high. They also can perform as D-type flip-flops if J and K are tied together. The 74HC109 is characterized for operation from 0°C to 70°C. The feature of 74HC109 is a package Options Include Plastic "Small Outline" Packages, Ceramic Chip Carriers and Flat Packages, and Plastic and Ceramic DIPs


Pinout of 74HC109 IC
Pinout of 74HC109 IC

Package Includes:

  • 1 x IC - 74HC109


Part number 74HC109
Technology Family LS
VCC (Min) (V) 4.75
VCC (Max) (V) 5.25
Bits (#) 2
Voltage (Nom) (V) 5
F @ nom voltage (Max) (MHz) 35
ICC @ nom voltage (Max)(mA) 15
tpd @ nom Voltage (Max) (ns) 35
IOL (Max) (mA) 8
IOH (Max) (mA) -0.4

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1.What is the function of the 74HC109 IC? 

  • The 74HC109 is a J-K flip-flop with preset and clear inputs that is dual positive-edge-triggered. In digital circuits, it is commonly used to store and control the state of signals in a variety of applications.

2.What are the preset and clear inputs in the 74HC109 IC used for?

  • The 74HC109 IC's preset and clear inputs are used to set the state of the flip-flops to either high or low. The preset input causes the Q output to be high, while the clear input causes the Q output to be low.