DM74ALS521WM

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The DM74ALS521WM is a monolithic synchronous-type 4-bit binary up/down counter with an asynchronous preset. This integrated circuit belongs to the logic-comparators family and it is designed specifically to incorporate a wide range of features and provide high performance. As such, its application field is primarily focused on devices requiring clock synchronization, counting and data processing.

The device features two functions - a synchronous input stage and an asynchronous preset stage. Its synchronous input stage consists of a 4-bit serial data input terminal, a clock input terminal and a synchronous clear input terminal. This stage is responsible for sequentially counting up or down according to the input clock signal. The asynchronous preset stage is responsible for direct loading of predetermined data into the synchronous counter upon receipt of a preset enable signal. The input data is also synchronized with the incoming clock prior to being stored in the synchronous counter.

In terms of its working principle, the DM74ALS521WM can be configured to count either up or down depending on the state of the clock input. When the clock is high, the counter will increment and when the clock is low, the counter will decrement. Additionally, the asynchronous preset stage provides for direct loading of predetermined data into the counter upon receipt of a preset enable signal. Once the preset enable signal is asserted, the data is synchronized with the clock and then loaded into the counter.

Furthermore, the device features two outputs - an overflow output (OVF) and a terminal count output (TC). When the counter reaches its maximum count, the overflow output is asserted, while the terminal count output is asserted when the counter reaches its minimum count. In addition, the DM74ALS521WM also contains a power-on reset (POR) circuit, which can be used to reset the counter at power-up.

In summary, the DM74ALS521WM belongs to the logic-comparators family and it is a monolithic synchronous-type 4-bit binary up/down counter. It features two functions: a synchronous input stage and an asynchronous preset stage, and provides two outputs - an overflow output and a terminal count output. It is designed to incorporate a variety of features and provide high performance and as such, finds its application on devices requiring clock synchronization, counting and data processing.

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