How 74HC595 Shift Register Works ? | 3D animated 🔥

Blue Butterfly
27 Apr 202103:45
EducationalLearning
32 Likes 10 Comments

TLDRThe video script introduces the 74HC595 shift register IC, a device that converts serial input to parallel output, effectively multiplying output pins by 8 with a single chip. It explains the IC's pin configuration, including VCC, ground, and eight output leads, as well as the data input pins comprising the clock (RCLK), and data in. The script demonstrates the IC's functionality with a practical example using an LED, highlighting how data is synchronized with clock signals and refreshed with RCLK. It also touches on processor registers and humorously calculates the number of ICs needed to create a 34 kilobit memory with an Arduino Uno, emphasizing the scale of such a project. The video concludes with an encouragement to like and subscribe.

Takeaways
  • 😀 The 74HC595 is a shift register IC that operates on a serial in, parallel out protocol.
  • 🔌 It has VCC and ground pins, along with eight output pins for connecting LEDs or other devices.
  • 🔄 The data input pins include a clock (CLK), a reverse clock (RCLK), and a data in (SER) pin.
  • 📶 Data is sent to the IC with pulses of high and low voltages synchronized with the clock signal.
  • 🕒 The clock signal is a consistent high and low signal with a fixed frequency that shifts data through the register.
  • 🔄 RCLK is used to refresh the output of the IC, ensuring the output is updated even after data is sent.
  • 💡 A processor register is a quickly accessible location for a computer's processor, often consisting of fast storage.
  • 🔌 The video demonstrates testing the 74HC595 with an LED, connecting it to the IC's ground and positive pins.
  • 🔗 Multiple ICs can be connected in series to increase the number of outputs, using the output seven-bar as data into the next IC.
  • 🧠 To create a memory of 34 kilobits using an ATmega328, one would need 34,816 ICs, illustrating the scale of such a project.
  • 👍 The video encourages viewers to like and subscribe to the channel for more content.
Q & A

  • What is the 74HC595 shift register IC used for?

    -The 74HC595 shift register IC is used for serial-in, parallel-out operations, allowing data to be received serially from a microcontroller and then outputted through parallel pins.

  • How does the 74HC595 shift register increase the number of output pins?

    -The 74HC595 shift register can increase the number of output pins by 8 using a single chip, which can be cascaded with additional ICs to further expand the number of outputs.

  • What are the main pins of the 74HC595 IC?

    -The main pins of the 74HC595 IC include VCC, ground, eight output pins, and data input pins which consist of clock (RCLK), and data in (SER).

  • How is data sent to the 74HC595 IC?

    -Data is sent to the 74HC595 IC by pulses of high and low voltages synchronized with a clock signal, where 5 volts represent a digital value of 1 and zero volts represent a digital value of 0.

  • What is the role of the clock signal in the 74HC595 IC?

    -The clock signal in the 74HC595 IC is a consistent high and low signal with a fixed frequency that acts as a data shifter for the register.

  • What does the RCLK (Register Clock) do in the 74HC595 IC?

    -The RCLK in the 74HC595 IC refreshes the output of the IC. It ensures that the output is updated even after the data has been sent to the IC, but it will not show the output until this signal is turned high.

  • What is a processor register and how does it differ from a shift register?

    -A processor register is a quickly accessible location available to a computer's processor, usually consisting of a small amount of fast storage. It differs from a shift register as it may have specific hardware functions and could be read-only or write-only, whereas a shift register is designed for serial data transfer and storage.

  • How can the 74HC595 be tested with a LED?

    -The 74HC595 can be tested with an LED by connecting the LED to the output pins of the IC. The LED will light up or change state based on the data shifted into the IC, demonstrating its functionality.

  • How many 74HC595 ICs would be needed to create a memory of 34 kilobits using an ATmega328 microcontroller?

    -To create a memory of 34 kilobits, which is 34 * 1024 bits, you would need 34,816 ICs of 74HC595, as each IC provides 8 bits of storage.

  • What is the significance of cascading 74HC595 ICs in series?

    -Cascading 74HC595 ICs in series allows for an increase in the number of output pins, enabling the control of more LEDs or other devices with a single microcontroller, thus expanding the system's capabilities.

Outlines
00:00
📶 Introduction to 74HC595 Shift Register

This paragraph introduces the 74HC595 shift register IC, a component that operates on a serial in, parallel out protocol. It explains how the shift register receives data serially from a microcontroller and outputs it in parallel through eight pins, effectively multiplying the number of output pins by eight using a single chip. The pin configuration of the IC is described, including VCC, ground, and the eight output pins for leads or other applications. Additionally, the data input pins and their functions—clock (CLK), reverse clock (RCLK), and data in (DS)—are detailed, with an explanation of how data is sent through pulses of high and low voltages synchronized with a clock signal. The paragraph also touches on processor registers and their role in providing quick access to a computer's processor, with some registers having specific hardware functions. The practical application of the 74HC595 is demonstrated through a connection with a lead, and the video script concludes with a call to action for viewers to like and subscribe to the channel.

Mindmap
Keywords
💡74HC595 Shift Register IC
The 74HC595 is a type of integrated circuit designed to shift data serially in and output it in parallel. It is a key component in the video script as it demonstrates how to expand output pins using a single chip. The script explains that this IC works on a serial in parallel out protocol, receiving data serially from a microcontroller and then outputting it through parallel pins, which is central to the video's theme of explaining the function and working of the shift register.
💡Serial in Parallel Out Protocol
This protocol refers to the method by which data is transmitted in a sequence (serially) and then outputted simultaneously on multiple pins (in parallel). In the context of the video, the 74HC595 shift register operates on this protocol, which is essential for understanding how the IC can increase output pins by 8 using a single chip, as mentioned in the script.
💡Pin Out
Pin out refers to the arrangement of pins on an integrated circuit and their functions. The script describes the pin out of the 74HC595 IC, mentioning VCC and ground pins, eight output pins, and data input pins like clock (RCLK) and data in. Understanding pin out is crucial for knowing how to connect and use the IC correctly, which is a central aspect of the video's educational content.
💡Data Input Pins
Data input pins are the terminals on an IC where data is fed into the device. The script specifies the data input pins of the 74HC595 as clock (RCLK) and data in. These pins are vital for the functioning of the shift register, as they receive the data that will be shifted and outputted in parallel, illustrating the core operation of the IC.
💡Clock Signal
A clock signal is a consistent high and low voltage signal with a fixed frequency that controls the timing of data operations in digital circuits. In the script, the clock signal is described as working as a data shifter for the register, synchronizing the data sent to the IC with pulses of high and low voltages, which is critical for the shift register's operation.
💡RCLK (Register Clock)
RCLK, or Register Clock, is a signal used to refresh the output of the IC. The script explains that even after data is sent to the IC, it will not show the output until the RCLK is turned high. This concept is important for understanding how the shift register manages data output, which is a key part of the video's educational message.
💡Processor Register
A processor register is a quickly accessible location available to a computer's processor. The script briefly mentions processor registers, describing them as consisting of a small amount of fast storage, with some having specific hardware functions. Although not the main focus of the video, this concept provides a broader context for understanding different types of registers, including the shift register being discussed.
💡Lead
In the context of the script, a lead refers to a component used for testing the 74HC595, with specific mention of connecting the lead with the IC. The ground and positive pin of the lead are connected to demonstrate the practical application of the shift register, showing viewers how to use the IC in a real-world scenario.
💡Output Seven-Dash
Output seven-dash refers to the data signal that passes after taking input from the data in pin of the 74HC595. The script explains that by connecting output seven-dash as a data into the next IC, one can increase the number of outputs using multiple ICs in series. This concept is crucial for understanding how to expand the functionality of the shift register IC.
💡Memory Calculation
The script includes a calculation to determine how many 74HC595 ICs would be needed to create a memory of 34 kilobits, using the 328 as a multiplier. This example serves to illustrate the scale of the IC's application and the vast number of ICs required for large memory capacity, which is an important consideration in digital electronics and a notable point in the video's narrative.
Highlights

The 74HC595 is a shift register that operates on a serial-in, parallel-out protocol.

It receives data serially from a microcontroller and outputs it through parallel pins.

The 74HC595 can increase output pins by 8 using a single chip.

The IC features VCC, ground, and eight output pins.

Data is input to the IC through a data in pin with synchronization from a clock signal.

A 5-volt signal represents a digital value of 1, while a 0-volt signal represents a digital value of 0.

The clock signal serves as a data shifter with a consistent high and low signal at a fixed frequency.

The RCLK signal refreshes the IC's output even after the data has been sent.

A processor register is a quickly accessible location for a computer's processor.

Some registers have specific hardware functions and may be read-only or write-only.

Testing the 74HC595 involves using a lead with a ground and positive pin.

The number of outputs can be increased using multiple ICs in series.

Output seven is used as a data input for the next IC in the series.

Calculating the number of 74HC595 ICs needed for a 34 kilobit memory using an ATmega328.

Thirty-four thousand eight hundred sixteen ICs would be needed for a 34 kilobit memory.

The video encourages viewers to like and subscribe to the channel.

Transcripts

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Shift Register74HC595Serial DataParallel OutputMicrocontrollerIC PinoutDigital SignalsElectronics TutorialOutput ExpansionTechnical Education