M74HC109B1R

The M74HC109B1R from STMicroelectronics is a high-speed CMOS dual JK flip-flop integrated circuit. Fabricated with silicon gate C2MOS technology, it features independent preset and clear inputs that are asynchronous and active low. The flip-flop changes state on the positive-going transition of the clock pulse, controlled by the logic level on the J and K inputs.

This device operates with a wide supply voltage range of 2V to 6V and boasts a typical clock frequency of 67MHz at 6V. It exhibits low power dissipation with a maximum quiescent current of 2μA at 25°C. The symmetrical output impedance is characterized by |IOH| = IOL = 4mA (MIN), and propagation delays are balanced (tPLH ≅ tPHL). Maximum propagation delay is specified as 26ns at 6V with a 50pF load.

All inputs are equipped with protection circuits against static discharge and transient excess voltage. The M74HC109B1R is pin and function compatible with the 74 Series 109. It is housed in a 16-DIP package and is suitable for through-hole mounting.

Key electrical characteristics include a typical input capacitance of 5pF and complementary outputs. The operating temperature range is -55°C to 125°C (TA). This component is designed for applications requiring reliable digital logic functions with fast switching speeds and low power consumption.