HCF4021BM1

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Logic - Shift Registers are among the most common integrated circuits. As their name implies, they are used to store, regulate and manipulate digital signals. The HCF4021BM1 is a component designed for logic-shift-register applications. It is made of on-chip CMOS logic and latches with high speed, low power capabilities that are perfect for many applications.

The HCF4021BM1 is an 8-bit parallel-in-serial-out shift register. This component is used in many different applications, including LCD displays, door access control, and robotics. In each application, the HCF4021BM1 operates with a common clock signal and its input signals (data, clock, etc.).

When operating with a clock signal, the HCF4021BM1 operates in a basic way: data that is provided in the Parallel-In (PI) pins is parallel loaded into the register on the rising edge of the clock. This data is then shifted out serially on the falling edge of the clock until all 8-bits of data have been shifted. Usually the Serial-Out (Q_) pin is connected to the next logic component to continue Logical Shifting, but the Q_ pin can also be used as part of the controlling input.

In addition, the HCF4021BM1 has two other input pins. The carry-in pin (C_) allows for additional data values to be carried into the register. The reset pin (R_) can be used to reset the register to a known state. By using the reset and carry-in pins the HCF4021BM1 can be used as a synchronous or asynchronous Counter, or as a parallel or serial load register.

One of the main problems with using shift registers is timing. The speed of the register performance is determined by the frequency of the clock signal. The HCF4021BM1 has a greater than 300 kHz maximum frequency and is also tolerant of large clock pulse-width variations, making them relatively fast and reliable.

The HCF4021BM1 is a very versatile component in the world of Logic - Shift Registers. Using the basic clocking and data-loading approach, the HCF4021BM1 can be used for a variety of different applications. Whether its simple serial shifting, Counters or LCD displays, the HCF4021BM1 is a great choice for many different applications.

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