74AC163SC

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The 74AC163SC is a high-speed synchronous 4-bit binary ripple counter/divider/register. It uses a low power Schottky-CLtechnology for high speed and dependability and is a member of a large family of LS parts. It is a CMOS device that is binary-coded accepting a high-frequency non-retriggerable input clock and provides individual outputs to indicate the count. The 74AC163SC application field involves large-scale field-programmable-gate-arrays (FPGAs), programmable-logic controllers (PLCs) clocks, frequency synthesisers and dividers as well as other applications.

Working Principle

At power-on, the 74AC163SC will start counting from 0 to 15 in binary, depending on the value of the count TTL input at power-up. The device requires a low-to-high transition of the clock input for each count. When the device is connected to a common clock, multiple devices can be daisy-chained, passing the count from one to the other to form a multi-bit counter. Every count is synchronous, meaning all the outputs change simultaneously. To prevent counting one more time, a load control input is provided for the device so it can be reset just before it completes its next count.

The 74AC163SC also includes an asynchronous reset input allowing the device to start counting from any given number on the reset terminal. When the reset terminal is low, the count is reset to zero. The counting sequence is then initiated with the next high-low clock transition on the clock input. This reset input can be used to reset a chain of counter circuits simultaneously or singly, depending on the reset enable circuit used.

The 74AC163SC has three different operating modes: individual mode, chained mode and daisy chained mode. In individual mode, only one device is connected with no additional components, and the reset and clock inputs are driven directly by TTL. In chained mode, multiple chips are connected together in a chain where the output from the first chip is used to drive the clock input of the second, and so on. In daisy-chained mode, multiple chips are connected together in a chain where the output from the first chip is connected to the reset of the second, the output of the second is connected to the clock input of the third and so on.

Conclusion

The 74AC163SC is a high-speed synchronous 4-bit binary ripple counter. It uses a low-power Schottky-CL technology for high speed and dependability and is a member of a large family of LS parts. The 74AC163SC can be used for FPGAs, PLCs clocks, frequency synthesisers, dividers as well as any other counting application. It has three different operating modes: individual mode, chained mode and daisy chained mode. The 74AC163SC can count from 0 to 15 and can be reset to any given number at start-up. Its reset input allows the device to start counting from any given number on the reset terminal. Overall, the 74AC163SC offers the user excellent performance and a reliable and efficient counting operation.

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