74HCT390D,653

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74HCT390D based counters are integrated circuits that form the core of many types of digital devices, from automation components to medical processors. The particular type of counter they use, the NE-653, is one of the most frequently used designs in the industry. It is usually paired with custom logic, since NE-653 requires a specific interface.

The 74HCT390D can be used in a wide range of applications, including electronic payment and ticketing systems, industrial automation equipment, medical instruments, and radio communications. In all these applications, accurate counters must be integrated, which is where the 74HCT390D comes in.

The 74HCT390D is based on the NE-653 counter, which is an 8-bit counter composed of three basic elements: a register, an arithmetical unit, and a logic gate. The register stores the count, the arithmetical unit adds and subtracts, and the logic gate determines when to increment, decrement, or reset the count. In a 74HCT390D device, the logic gate will typically be two separate NAND gates.

The 74HCT390D can be used as either a divide-by-n counter, where the count is increased or decreased by a fixed amount (e.g. 8 or 12), or a divide-by-x counter, where the count is increased or decreased by a variable amount (e.g. 1, 2, or 4). The divide-by-x counter can also be configured to count in powers of two (1, 2, 4, 8, 16, etc.).

The 74HCT390D can also be used as an up/down counter, with the count being increased or decreased by one every time a preset value is reached. This type of counter is often used in applications such as metering, where the count is reset after reaching a predetermined value.

In addition to counting, the 74HCT390D can also be used as a shift register, where the output of one stage is fed into the input of the next, allowing data to be quickly moved through the register. This type of register is used in applications such as circuit testing, where data is quickly loaded into the register and then shifted out.

The 74HCT390D is a versatile device, capable of performing a wide range of counting and shifting operations. It is an essential part of many digital devices, and its use is sure to continue for many years to come.

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