HCF4021
HCF4021 is an 8-stage static shift register that can be used for serial-to-parallel data conversion.HCF4021
HCF4021 is an 8-stage static shift register that can be used for serial-to-parallel data conversion.
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Manufacturer Part # : HCF4021
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Package/Case: SOP-16
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Brand: STMicroelectronics
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Product Categories : Shift Registers
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HCF4021 DataSheet
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Details
The HCF4021 is a synchronous up/down counter IC (integrated circuit) that consists of an 8-stage binary counter with a storage register and three-state outputs. It is commonly used in various applications such as frequency division, time delay generation, event counting, and address generation.The IC has a maximum clock frequency of 10MHz and an input voltage range of 3V to 18V. It features parallel and serial data inputs, allowing for flexible operation in either up or down counting modes. The HCF4021 also includes a carry input and output for cascading multiple counters together.One of the key features of the HCF4021 is its three-state outputs, which allow the outputs to be disabled or enabled depending on the control input. This provides flexibility in interfacing with other devices or circuits without the need for additional buffers.The HCF4021 is housed in a 16-pin DIP (dual in-line package) or SOIC (small outline integrated circuit) package, making it easy to solder onto a circuit board. It is a cost-effective and reliable solution for a wide range of counting and timing applications
Key Features
- 8-bit parallel-in/serial-out shift register
- Parallel input is synchronous with the clock
- Clock and clear inputs
- Serial output available
- Direct overriding clear function
- Wide operating voltage range
- Compatible with TTL and CMOS logic
Application
- The HCF4021 can be used in electronic circuits for applications such as shift registers, data storage, and input/output expansion.
- It can also be used in microcontroller projects to expand the number of input pins available for connecting external sensors, switches, and other devices.
- Other applications include LED displays, digital clocks, and other projects where a large number of inputs need to be monitored or controlled.
- The HCF4021 is commonly used in hobbyist electronics projects, educational activities, and prototyping to simplify the process of connecting multiple input devices to a single microcontroller.
Specifications
The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.
Manufacturer | STMicroelectronics | Product Category ! | IC Chips |
Datasheet PDF
Datasheets record the features, absolute maximum ratings, applications and more of the device, which benefit a lot as an overall guide to the specific application of the part.
FAQs
What is HCF4021?
The HCF4021 is an 8-stage static shift register IC (Integrated Circuit) manufactured by STMicroelectronics. It is commonly used for parallel-to-serial data conversion, storage, and transfer applications in digital systems.
How Does HCF4021 Work?
The HCF4021 operates by capturing parallel input data and shifting it serially through its stages. Each clock pulse advances the data from one stage to the next, allowing for serial output. The IC can store the incoming data until needed, making it suitable for various serial data handling tasks.
How Many Pins does HCF4021 have and What are the Functions of the Pinout Configuration?
The HCF4021 is housed in a 16-pin DIP (Dual Inline Package) or SOIC (Small Outline Integrated Circuit) package. The pinout configuration includes:
- QA-QH: Data output pins for the 8 stages.
- DS: Serial data input pin.
- SH_CP: Shift clock input for shifting data.
- ST_CP: Storage clock input for latching data.
- MR: Master reset input for clearing the register.
- VDD, GND: Power supply and ground pins.
What are the Pros and Cons of HCF4021?
Pros:
- Parallel-to-Serial Conversion: Facilitates easy conversion of parallel data to serial output.
- Simple Control Interface: Requires basic clock signals for shifting and latching data.
- Expandable Capability: Multiple HCF4021 ICs can be cascaded for increased storage stages.
- Versatile Use: Suitable for various applications including data logging, LED displays, and serial communication.
Cons:
- Limited Features: Basic shift register functionality without advanced processing capabilities.
- Propagation Delay: Clock skew can affect the timing and synchronization of the output data.
- Additional Logic Required: External control logic may be needed for specific applications beyond basic shifting and storage.
Are There Any Equivalents/Alternatives to HCF4021 for Recommendation?
- The CD4021 from Texas Instruments is a similar 8-stage shift register IC.
- Alternatives to the HCF4021 include the 74HC595 from NXP Semiconductors and the SN74HC165 from Texas Instruments.
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