74AC191SJX

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The 74AC191SJX is a high-performance high-speed synchronous 4-Bit Binary Counter. It is a member of the Sierra family of CMOS logic devices from Texas Instruments. The Sierra family includes a wide range of CMOS devices, including programmable logic, memory, and data conversion ICs, as well as various logic converters, buffers, and gates, providing designers with a single source for all their logic and I/O needs. The 74AC191SJX is a 4-bit Binary Counter that combines a synchronous programmable preset with parallel load capability.

Application Field

The 74AC191SJX is ideal for use as a Programmable Counter, Presettable Down Counter, or Divide-by-N Counter. It is most often used to generate timing, clock, and frequency division applications, or as a counter in robotics, industrial automation, and process control systems. The asynchronous master reset input allows fast and easy resetting of the counter’s value, while the synchronous parallel load input allows the user to preset the counter’s count.

Working Principle

The 74AC191SJX is a synchronous 4-bit binary counter that counts in a binary ripple fashion from 0 to 15. A low-to-high transition at the “UP” input causes the outputs to increment on the low-to-high transition of the clock input. The binary count is loaded into the counter when a low-to-high transition of the Load enable input is coincident with the low-to-high transition of the clock. The outputs are preset to “15” when a low-to-high transition of the Master Reset pin is coincident with the low-to-high transition of the clock. The counter will not be preset if the Load enable pin is low during the low-to-high transition of the Master Reset pin.

The synchronous loading of parallel data into the counter is accomplished by using the Load enable input. When the Load enable input is high, the data present on the Parallel Inputs is loaded into the counter, overriding the count on the next clock rising edge. The data is loaded only when the Load enable input is high and is not loaded if the Load enable input is low.

The 74AC191SJX operates from a single power supply that can range from 2.4 to 5.5 volts. The device is supplied in a standard 14-pin dual in-line package and is rated for operation from 0 to 70 degrees Celsius. It can also be specified as a mil-qualified device.

In summary, the 74AC191SJX is a high-performance logic device for programmable counter, presettable down counter, and divide-by-N counter applications, providing fast and easy resetting of the counter’s value, as well as synchronous parallel load capability.

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