MC74HC390AN

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MC74HC390AN, produced by ON Semiconductor, is an integrated circuit (IC) designed in the form of a dual fixed-modulus frequency divider/divider-counter IC, which is a type of 4-bit binary counter. The device is based on a sequence of up/down counter stages, each with a separately- controllable reset feature. The device can be driven from a single clock line via a controlled slew, which allows for accurate control of the output frequency from the clock line even when the two counters are operating out of phase.

The MC74HC390AN comes in a 14-pin dual-in-line plastic package with an open collector output configuration. The device is designed to work with a wide range of input frequencies, from DC to 50 MHz. Its wide input frequency range makes it useful for applications involving pulse counting, frequency division, and other types of counting or framing. It can also be used as a down-counter (counting backwards from a preset value to 0) or as an up/down counter, with a reset and a preset feature.

The working principle of the MC74HC390AN is a simple counter. A 4-bit latch is incorporated into the design of the IC, which is 5-bit in those devices with connectable enable pins. There is a single enable pin for the device and two enable pins for each of the four registers. The enable pins, DE and OE, must be connected together when the device is being used. This connection to the enable pins allows the data output of the IC to be synchronized with the clock input.

The inputs to the IC are supplied clocks and the output is a periodic signal. The output frequency is determined by the clock input frequency. The output can be counted up or down depending on the direction control pin, which is available on some models. The device also has a reset pin to reset the counter and a preset pin to control when the counter should start.

The MC74HC390AN\'s output can be used in various applications, from digital signal processing and instrumentation to microcomputer systems and digital logic circuits. It is used in applications such as triggering alarms and counters, making it useful for communications systems. It can be used for frequency counting and division, as well as for precise phase-locked loop circuits. The device is also often used for making precise phase measurements for a variety of applications.

Overall, the MC74HC390AN is a versatile, reliable IC that can be used for a wide range of applications. Its wide input frequency range makes it suitable for many signal processing and communications applications, while its precise output makes it useful in instrumentation and precise phase measurements. Its ability to count up and down, reset, and preset makes it ideal for use in frequency dividers, alarm triggers, and counters.

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