74LVQ74SJX

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Logic - Flip Flops

Flip flops are electronic circuits whose output responds depending on changes in the input. Flip flops are the basis for more complex digital circuit designs. The 74LVQ74SJX, a dual D-type flip flop, is one of the more common flip-flop designs employed in digital logic and computer integrated circuit designs.

Application Field

The 74LVQ74SJX is a low-voltage, low-power dual D-type flip flop with a single clock input. It is used in communication networks, industrial automation, and consumer electronics. For example, it is used in digital televisions for control of the digital video recorder and such. The 74LVQ74SJX is capable of operating in temperatures ranging from -40°C to 85°C, making it well-suited for functioning within product enclosures.

Working Principle

Flip flops are clocked logic networks that employ a data input and output. Unlike other logic systems, the output is controlled by the clock and is not a direct function of the input. The basic 74LVQ74SJX architecture consists of a pair of D-type flip-flops. A single clock signal (CP) controls the latch in each flip-flop. The clock signal is used to activate the data inputs (D) of the two flip-flops. The data (D) is passed through the flip-flops in a serial manner, with the outputs (Q) of one connected to the inputs (D) of the other. The outputs (Q) of the flip-flops are the output signals of the 74LVQ74SJX.

Operations Details

The operations mode of the 74LVQ74SJX can be divided into two parts: post-trigger output and pre-trigger output. In the post-trigger operations mode, the output follows the input in a serial manner. If a trigger signal is received, the outputs of the two flip-flops are latched and held in the same state until the trigger signal is removed. This means that the data is captured at its current state when the trigger signal is triggered, and the same data is held until the trigger is removed. In the pre-trigger operations mode, the output follows the input in a parallel manner. The output of each flip-flop is immediately updated to the current data state when a trigger signal is received, and is held until the trigger is removed.

Conclusion

The 74LVQ74SJX is a dual D-type flip flop used in a wide range of electronic and computer logic circuit designs. It operates with a single clock input and can be used in temperatures from -40 °C to 85 °C. The flip flop offers two operational modes; post-trigger output, in which the output follows the input in serial mode, and pre-trigger output, in which the output follows the input in parallel. These features make the 74LVQ74SJX an attractive and reliable digital circuit design element employed in many consumer electronics, communications, and industrial automation fields.

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