DM74LS90N

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The DM74LS90N is a type of logic integrated circuit that is used for frequency division and counting functions. It is part of a family of counters and dividers, primarily used in digital circuits. The device has four internal counters, and can be used to create high frequency digital signals.The DM74LS90N is a synchronous four stage binary counter made up of four JK negative edge triggered flip-flops. The device is capable of operating to a maximum frequency of 50 megahertz over the temperature range of -55°C to 125°C. Each flip-flop features an E-reset input, which clears the output of its first stage to 0 as long as the enable input is high.The device consists of four J-K flip-flop stages, and each has its own enable input, a common clock input, and individual reset inputs. Each stage is positive edge-triggered, and will therefore change states on the positive rising edge of the clock signal. The output of the device can be taken from the flip-flops’ Q outputs.In terms of frequency division applications, the DM74LS90N can be used to produce a signal of frequency one-fourth (1/4) of the clock applied to the device. This signal can then be used to divide a higher frequency clock signal into four equal parts with the same frequency, duration and amplitude of each part being equal.The DM74LS90N can also be used to count a digital signal. This is achieved by the sequential setting of the flip-flops in the DM74LS90N. When the clock signal is applied to the device, each stage of the flip-flops sets itself to the state of the signal applied to its data input. This then produces a digital signal corresponding to the count of the clock signal.The DM74LS90N can also be used in multiplexer applications. This is achieved by applying a specific count to the device, and then applying binary digital inputs to the output. The count at which the binary inputs will be selected can be pre-set. This allows for more complex operations to be carried out.In conclusion, the DM74LS90N is a versatile logic device used for frequency division and counting applications. It is capable of operating up to a maximum frequency of 50 megahertz and is capable of performing a wide range of operations, due to its multiplexer capabilities. The device is also capable of being used as a programmable synchronous counter and it also possesses reset inputs for each of its flip-flop stages.

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