DM74AS163M

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The DM74AS163M is a ripple counter, a type of sequential logic device typically referred to as “cascadable”. A ripple counter is unlike synchronous counters because the inputs and outputs of coplanar devices are asynchronous, meaning they operate on different clocks. The DM74AS163M has a ripple control input and is used when an orderly sequence of signals must be generated to perform an operation. It counts on each clock pulse, so the output frequency is a division of the input pulse. Therefore, it is classified as one of many counter logic circuits, as well as in the list of dividers.

The application field of the DM74AS163M is quite extensive. In addition to being a divide-by-N counter, it can also be used to implement any repetitive operation in digital systems, such as production line control, cycle counters, or digital display counters. Another application is in the field of data processing and calculation. Digital dividers can be used to subdivide digital input frequencies into output frequencies or to generate an output signal cyclically. As a simple divide-by-N binary counter, it can provide the signals necessary to implement binary or gray counting, or even one-hot parity functions.

A basic introduction to the working principle of the DM74AS163M can help to explain its use. The DM74AS163M consists of two basic components - a four-bit synchronous counter and an asynchronous presettable counter. The synchronous counter, commonly known as a divide-by-N counter, takes the low-to-high-to-low input pulse and counts the number of rising edges to provide the output. The presettable counter, on the other hand, is an asynchronous counter that provides a count equal to the programmed preset value. It is possible to program the count by loading the preset value over the asynchronous data inputs.

The DM74AS163M provides an efficient means to generate repetitive count patterns from any asynchronous clock. The synchronous counter outputs a synchronous count on each rising clock edge, while the asynchronous counter provides a constant count with the programmed preset data. The four outputs of the synchronous counter and the four outputs of the asynchronous counter are fed into a 4-bit ripple counter. The ripple effect occurs when each output pulse is used to reset its following counter, thereby inducing the ripple effect known as a cascadable ripple counter. The cascadable ripple counter thus provides a frequency division of the input clock of N times (N is determined by the preset data).

The DM74AS163M is used to implement divide-by-N functions in a variety of applications. In addition to using the DM74AS163M as a simple binary counter, it can also be used to realize any divide-by-N counter for data processing and calculation by providing a divide-by-N output. In order to obtain precise output divisions of the input clock, it is necessary to adjust the input duty cycle properly (using a duty cycle corrector) for best results.

In summary, the DM74AS163M is a cascadable ripple counter that uses a four-bit synchronous counter and an asynchronous presettable counter to generate repetitive count patterns from any asynchronous clock. It is an ideal device for applications requiring a divide-by-N output and allows to precisely divide the input clock frequency. This makes it a very versatile device with a wide range of applications in the fields of data processing, calculation, production line control, cycle counters, digital displays, and binary or gray counting.

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