74HC390DB,118

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The 74HC390DB,118 is a high-performance circuit within the logic division of counters, dividers. This part is a dual decade up/down counter with decoded seven-segment display output. It contains two 4-bit binary counters, binary presettable counters, oscillator, constant-current segment, and decoder which is used to generate the output. The up/down signals, select inputs, and other control signals are decoded to produce the appropriate output.

The 74HC390DB,118 application field is in medium-speed and high-speed logic systems. It can be used in digital circuits that require counting and division of digital signals. The device can be used to count from 0 to 99 with a single input, such as a digital strobe, or the device can be used to count from 0 to 99 with two inputs, such as a digital clock and an up/down counter counter. The device can also be used to divide digital signals in frequency division multiplexers.

The working principle of the 74HC390DB,118 is based on a binary counter circuit. The binary counter is a circuit with n-bit input and output. The output of the counter is determined by an input code of the binary signals. The counter increases the output by one each time a pulse is applied to the input terminal. For example, if the binary counter has 4-bit input, when the input field contains the code “1001”, the output will be “0001”. The counter will then successively increase the output to “0010”, “0011”, “0100”, and so on, until the maximum output of “1111” has been achieved.

The 74HC390DB,118 circuit includes two binary counter circuits. The first counter is a 4-bit binary counter with a selectable up/down mode. The second counter is a 4-bit binary counter with binary presettable capability. Both counters can be used together or separately according to the user requirement. The output of the selectable 4-bit binary counter is connected to a decode logic circuit which produces a 7-segment code that can be used to drive the 7-segment display. The binary presettable counter is used in reset operation and can be preset with any 4-bit binary signal.

The 74HC390DB,118 includes a constant-current segment decoder which is used to convert the binary signal of each segment into constant-current signals to drive the 7-segment display. The decoder also includes safeguards against incorrect decoding and incorrect data input. It also includes logic circuits to reset the counters and to generate a 7-segment display coded “00” on power-on.

In conclusion, the 74HC390DB,118 is a high-performance circuit that is part of the logic division of counters, dividers. It provides excellent performance for medium-speed and high-speed logic systems. It can be used to count from 0 to 99 with a single input or two inputs, or to divide digital signals in frequency division multiplexers. The device is built with two binary counter circuits and a constant-current segment decoder that provides a 7-segment code to drive the 7-segment display, as well as reset and display initialization features.

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