CD4021BPW

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The CD4021BPW is a high-performance 8-stage serial-in, serial-out shift register. It belongs to the logic-shift-registers family and has the capability of operating on the lower supply voltage with individual clock enable functions. This type of shift register is designed to minimize the size, complexity, and power consumption while providing efficient parallel, shift register operations.

The CD4021BPW can be used as a modulo counter and is able to hold 8 bits of data in a serial and parallel format. The device has multiple control inputs including Pin 1’s master reset, and pins 3 and 4’s clock enable which allows individual channels to be enabled or disabled, based on the logic of the information. The D input of the device is wired directly to the S pin, making the CD4021BPW a universal shift register for almost any application.

The CD4021BPW has the ability to operate from a wide range of supply voltage and is able to drive multi-channel logic to a high-precision level. The type of logic that utilizes this device is typically low power logic applications, such as logic level converters, line drivers/ receivers, encoders and decoders. With its 8-stage design, once switched on, the bitstream will continue to shift from the 8th to the 1st pin in a very short period of time.

The working principle of the CD4021BPW is relatively simple and is based on the universal shift register theory. There are three main inputs to the shift register; the S pin, which is the serial data input and the clock and reset inputs. When the clock signal is high, the data at the S pin is clocked into the first stage of the register, in parallel and then shifted through the rest of the stages. The reset signal is used as an asynchronous reset which sets all state outputs to the low logic level.

When designing with the CD4021BPW, its recommended that series resistors are connected between any input and the power supply and any output and the power supply to minimize overshoot and ringing. Suppressors can also be connected across each side of the power supply to help suppress any variations on the power supply. It is also important to pay attention to the voltage on the clock input and the S pin, as it can create errors.

The CD4021BPW offers the user a reasonably priced and efficient technique for storing data. Its 8-stage design makes it bulky and power efficient, suitable for various application domains like data acquisition systems, communication systems, traffic lights, etc. It is important to note that this device uses high frequency clocking which might result in uncontrolled spiking and ringing in the output signals. Hence, it is important to make sure that the board loop and the power supply loops are adequately isolated through resistors and suppressors to prevent any problems.

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