74AC374SJX

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The 74AC374SJX logic flip flop is a long established instance of clocked D-type flip flop. This one has separate preset and clear active low inputs. Here, the edge-triggered D-type flip flop will be interrogated and explored.

A flip flop is a special type of clocked synchronous circuit which contains a memory element. This memory element will store a single bit of data, often binary, for an undefined amount of time. Flip flops can be used to build larger memories as well as controlling when events take place. The 74AC374SJX, being an example of edge-triggered D-type flip flop, is capable of doing this and more.

Applications

The 74AC374SJX is most often used to create larger memories, this is due to its ability to output the inverse of its current state. This output of the inverse, or compliment, of the stored bit makes it ideal for use as a memory register, as more specific parts of the memory can be selected. Other uses of the 74AC374SJX include shift registers, as by clocking in data to the flip flop it can be transferred out of the device bit by bit in the same order it was clocked in. The 74AC374SJX is also often used as a data selector, as well as for sampling intermediate values for operational amplifiers.

Functioning of the 74AC374SJX

As a flip flop, the 74AC374SJX contains a clock input, or a “C” in order to activate the device. Also, the 74AC374SJX contains two data inputs, a “D” (data) and a “PN” (Preset/Nand). As the 74AC374SJX is typically used in a higher powered circuit, the “D” output is active low, so a low going pulse on the “D” input will cause a flip flop state change. Another important feature of the 74AC374SJX is that the Complement Output is derived from the true output, they will both lead to the same conclusions. To make sure the device runs properly, a low going pulse on the “C” or clock input is needed, this causes the circuit to latch the data that is currently present at the “D” input, and store it as the present state. After clocking, the “D” input can be changed, and the state will remain in memory until the clock is triggered again. If a low state is present at the “PN” input, this will override any other data presented to the circuit and output a low state no matter what the clock does.

Conclusion

The 74AC374SJX edge-triggered D-type flip flop is one of the most widely used flip flop circuits due to its versatility and low power consumption. It is most often used as a memory register, shift register, and as a data selector due to the inverse output of the attribute. Also, the usage of the 74AC374SJX as an operational amplifier is notable. All in all, the 74AC374SJX is one of the most useful and influential logical flip flop circuits.

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