74HC165

The 74HC165 is an 8-bit parallel-load shift register integrated circuit (IC) belonging to the 74HC logic family. Here’s a breakdown of its key features:

• Function:

  • Serial Input: It can receive data serially (one bit at a time) through a dedicated data input pin (DS).
  • Parallel Input: It can also load data in parallel (all 8 bits simultaneously) through eight individual data input pins (D0 to D7).
  • Shift Register: It stores and manipulates data in a series of flip-flops. Data is shifted one bit position at a time with each clock pulse.

• Logic Family: 74HC – Uses high-speed CMOS technology, offering good noise immunity and relatively low power consumption.

• Additional Features:

  • Parallel Load Enable (PL): Controls whether data is loaded in parallel (low PL) or serially (high PL).
  • Clock Enable (CE): Enables or disables the clock input (CLK) that governs the shifting operation.
  • Clock Input (CLK): On the rising edge (low-to-high transition) of this signal, data is shifted within the register.
  • Serial Output (QH): Provides the data that is being shifted out of the register. It also has a complementary output (Q̅H) available on some variants.

Applications:

• Serial-to-parallel data conversion: Receiving data serially and storing it in parallel format for a microcontroller or other device to access.
• Data buffering: Holding data temporarily before it’s used in a circuit.
• Shifting data patterns: Implementing various functionalities like sequence generation or controlling multiple outputs in a specific order.
• Interfacing with microcontrollers: Expanding the number of input or output pins for a microcontroller by using multiple 74HC165s in cascade.

Resources:

You can find the datasheet for the 74HC165 online at various electronics component distributors or websites like:

• Texas Instruments: [invalid URL removed]
• Nexperia: https://www.nexperia.com/product/74HC165BQ-Q100
• Alldatasheet (may include datasheets from various manufacturers): https://www.alldatasheet.com/view.jsp?Searchword=OPEN&sField=3

The datasheets will provide detailed specifications, pin configuration, truth table, and timing diagrams to help you understand how to use the 74HC165 effectively in your electronic projects.