SN74LS109ADRE4

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SN74LS109ADRE4, as a part of the 74LS family of logic ICs, a very popular range of components designed to replace and improve upon the ubiquitous 7400 series, is a 3-input D type Flip‑Flop (transparent register) with set and reset functions. It can be used to store and measure information as it changes from one state to the other. The 74LS109ADRE4 contains three inputs (NAND): Clock (CP) Pulse, Data Input (D), and Reset (R); and two outputs (Q and Q\'): the inverted version of each other. Q’ will be 1 whilst Q is 0 and vice versa.

The basic principle of operation is that the Flip-Flop will maintain the present state until a change is applied, this is known as the stable state. When the CP is raised to logic high the state of the output will be changed to the opposite of its current state. When the input triggers a state change, the output is said to be unstable and a finite moment of time will remain until the output returns to its stable state.

This type of Flip-Flop can be used to create a synchronous counter, which is useful for counting manual inputs such as the pressing of buttons, or in the case of multiple Flip-Flops, binary numbers. This would be achieved by feeding the output of one Flip-Flop (the output of Q) as the CP for the next. Each Flip-Flop can hold one bit of a binary number. Powering multiple Flip-Flops with the same Clock results in a synchronous counter.

In addition to the previously mentioned properties, this logic chip offers the spesific feature of a Set and Reset feature. Reset is used to reset the Flip-Flop state to low, regardless of the inputs and Clock pulses. In a similar manner, the Set feature makes the output high regardless of the inputs and Clock pulses. This is particularly useful when used as part of a larger digital circuit as a reset and also provides an asynchronous counter i.e. one not synchronised to a Clock pulse.

The SN74LS109ADRE4 Flip-Flop is used in a variety of applications. Its dual outputs, built-in functionality and robust design mean it is suitable for embedded applications. It can be used in industrial control systems such as Programmable Logic Controllers (PLCs), robotics and embedded systems. It is most commonly used as a permanent memory storage device, as part of an analogue to digital converter, in time keeping systems, frequency dividers and sample and hold circuits. The reset and set features can be used as an additional safety feature if the circuit requires it.

To summarise, the SN74LS109ADRE4 is a Dual Input Positive-Edge-Triggered Flip-Flop which offers an asynchronous reset and set option. It is most commonly used as a memory storage device, as part of a counter, as an input for a PLC, and in timing and safety applications. It is an invaluable part of many digital circuits, making it a very necessary device.

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