74AC163SCX

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The 74AC163SCX is a synchronous presettable 4-bit binary counter with asynchronous preset. The counter uses a parallel load register, providing quick access of individual bits within the group of four. An asynchronous clear input resets all outputs, regardless of clock status. The counter is particularly suited for high-speed counting applications. This article covers the application field and working principle of the 74AC163SCX.

Application Field

The 74AC163SCX is designed to meet the needs of a wide variety of application fields. It can be used in communication systems, computer systems, industrial automation, automotive industry, educational product and consumer electronics. For example, in communications systems, it is often used for automatic counting of pulses and data serial transmission, such as in high-speed modems and multiplexers. In the computer field, it is used for character frequency counting, pulse counting and simple data organization, such as in microprocessors and memory management. In industrial automation, the counter is used for assembly line control, speed adjustment, and time control. In automotive systems, it can be used for vehicle speed measuring and motor and generator speed control. In educational tools, it can be used for digital display, data storage and pulse counting. Finally, it is useful in consumer electronics for digital clock/calendar applications and distance counters.

Working Principle

The 74AC163SCX is a 4-bit binary counter with asynchronous preset. It comprises four D-type flip-flops, with buffered inputs and open-collector outputs. It is synchronous to the rising edge of the clock input, and all four flip-flops change simultaneously. The clear input performs an asynchronous reset of all outputs. As a result, the output of each flip-flop can be either one or zero. In addition, the 74AC163SCX has inputs that allow parallel loading of any desired data pattern. This feature provides quick access of individual bits within the counter.

The 74AC163SCX has two control inputs. The Preset (PRE) input, upon being activated, causes all outputs to go to the number one state without regard to any other signals. The Clock Enable (CEN) input, when high, allows the counter to clock from low to high. When CEN is low, the outputs will remain in the same state. These two control inputs can be used to load multiple counters with the same data pattern and then simultaneously enable them for counting.

The 74AC163SCX can be used to count from 0 to 15 in binary. Its outputs are laid out in a true binary format, meaning that the least significant bit is connected to the output Q4, and the most significant bit is connected to the output Q1. The outputs are open-collector outputs, and require external pull-up resistors to enable them. Also, note that the counter has no built-in oscillator, and thus needs to be clocked externally.

In summary, the 74AC163SCX is a synchronous presettable 4-bit binary counter with asynchronous preset. It can be used in a wide variety of applications, and its open-collector outputs require external pull-up resistors to enable them. The counter has two control inputs, Preset and Clock Enable, which make it easy to load multiple counters with the same data pattern and then simultaneously enable them for counting.

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