MC74HC393AN

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MC74HC393AN is a logic IC (Integrated Circuit) that belongs to the family of logic counters, dividers and registers. It is a dual 4-bit synchronous presettable up/down counter that consists of two identical D-type flip-flop stages, each with a clock enable input and two individual master reset inputs. With this IC, one can design various applications, including medical and industrial control systems, along with event timers.

In its simplest form, the MC74HC393AN is designed to count accurately between 0 and 15 (four bits from 0000 to 1111) when triggered by an appropriate signal, usually a clock. This entity can be used for counting and timing, frequency division and division of clock speeds in different parts of a circuit. When connected to other counters, it can increase the range of counting capabilities by several orders of magnitude.

The working principle of MC74HC393AN is based on the concept of dual 4-bit presettable counter. Each of the two stages consists of two individual 4-bit synchronous presettable up/down counters with a common clock enable and a master reset. These two stages are internally wired to cascade onto each other, thus allowing the number of counts to be extended. The power supply required is 5V and the output is active at TTL level.

The up/down feature enables the user to control the MC74HC393AN via two input signals, an up/down (UD) signal, and a reset signal. Upon receiving a low level input on either of these two signals, the count is incremented (increase) or decremented (decrease) in an up or down direction, respectively. The reset signal will reset the count to its start state (all bits to zero). When the UD input is high, the count is disabled, and an up/down cycle will not take place.

The MC74HC393AN has two outputs, a Q output and a complement-of-Q output. The output signals are either low or high, depending on the state of the count bits. The device also has an additional output, a counting enable (CE), which goes high to let the user know that the count has changed and a low value indicates that the count has stopped.

The MC74HC393AN is typically used in industrial and medical control systems, along with event timers. It can be used as a frequency divider, which can divide the frequency of a signal by an integer value, as well as a clock divider, which can divide the speed of multiple clocks to different parts of a circuit. Its ability to count accurately from 0 to 15, combined with its presettable up/down feature and the two outputs, makes this IC suitable for a wide range of applications.

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