M74HC109 is a high speed CMOS dual J-K flip-flop with preset and clear, fabricated with silicon gate C2MOS technology. In accordance with the logic level on the J and K input this device changes state on positive going transition of the clock pulse. CLEAR and PRESET are independent of the clock and are accomplished by a logic low on the corresponding input. All inputs are equipped with protection circuits against static discharge and transient excess voltage.