CD74ACT163E

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The CD74ACT163E is a synchronous, presettable 4-bit binary counter. It has an asynchronous master reset input, which when used in conjunction with the synchronous parallel counted data input, or presetting allows the counter output count sequence to be preset or externally synchronous. Because it is synchronous, it can be driven by the system clock discrete logic while the binary outputs are available to the system. This article will discuss the application of CD74ACT163E and its working principle.

Application of CD74ACT163E

The CD74ACT163E is widely used in many electronic systems because of its wide range of applications. One of its main usages is as a couter for timing purposes. It can be used to count incoming pulses and generate a binary output or it can be used to divide a frequency by an integer number. Another application is buffering address and data lines between memory and data processing logic, which improves the reliability and speed of an electronic system. The presettable feature of CD74ACT163E also allows its use in logic control systems such as storage registers.

Working principle of CD74ACT163E

CD74ACT163E consists of four synchronous, edge-triggered binary counters. Each of the four counter stages drives a separate D-type flip-flop. Data on each of the D inputs can be loaded into the flip-flop on the rising edge of the clock pulse (CP). The output of each flip-flop is connected directly to the D inputs of the next flip-flop. As a result, the output count sequence of the flip-flops is determined by the sequence of data loaded.

The counter can be preset or cleared by the asynchronous master reset (MR) control input. The master reset will reset all counters when it is asserted. It can also be used to disable the counter output.

The synchronous parallel data (PD) input allows the binary count information to be loaded synchronously and in parallel into each of the four stages. This feature permits the synchronous loading of the count information and simplifies the liberation of the counter output.

The output of the flip-flops of the CD74ACT163E will remain unchanged when any of the control inputs, MR or CP, is low. When CP is high, the output depends on both the state of the D and CP.

When either the MR or the PD pins are left unconnected, both are assumed to be logic low. Unconnected MR will enable the counter, with an MR of logic high, the counter is reset and no operation is possible. Unconnected PD will cause the data present on the D inputs at the time of the rising edge of CP will be passed through to the Q Outputs.

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