IC 7475 – Dual 4-Bit Static Shift Register

Overview

The IC 7475 is a dual 4-bit static shift register designed for use in digital circuits. It is used for storing and shifting data serially. The IC can handle parallel load operations and serial data shifts, making it versatile for various data handling tasks in electronic systems.

Features

• Dual 4-Bit Shift Registers: Contains two independent 4-bit shift registers.
• Static Operation: Maintains data without needing a clock signal for data retention.
• Parallel Load: Allows loading data in parallel into the shift registers.
• Serial Input/Output: Facilitates serial data shifting in and out of the registers.
• Shift and Load Control: Provides control inputs for shifting and loading operations.
• Asynchronous Reset: Includes a reset function to initialize the registers to zero.

Pin Configuration

The IC 7475 is typically available in a 16-pin Dual In-line Package (DIP) format. The pinout is as follows:

• Pin 1: QD (Least Significant Bit, Shift Register 1)
• Pin 2: QC (Next Bit, Shift Register 1)
• Pin 3: QB (Next Bit, Shift Register 1)
• Pin 4: QA (Most Significant Bit, Shift Register 1)
• Pin 5: CLR (Asynchronous Reset for Shift Register 1)
• Pin 6: PL (Parallel Load for Shift Register 1)
• Pin 7: DS (Serial Data Input for Shift Register 1)
• Pin 8: Clock (Clock Input for Shift Register 1)
• Pin 9: QD (Least Significant Bit, Shift Register 2)
• Pin 10: QC (Next Bit, Shift Register 2)
• Pin 11: QB (Next Bit, Shift Register 2)
• Pin 12: QA (Most Significant Bit, Shift Register 2)
• Pin 13: CLR (Asynchronous Reset for Shift Register 2)
• Pin 14: PL (Parallel Load for Shift Register 2)
• Pin 15: DS (Serial Data Input for Shift Register 2)
• Pin 16: Clock (Clock Input for Shift Register 2)

Working Principle

The IC 7475 operates as follows:

1. Parallel Load: Data can be loaded into the shift registers in parallel via the parallel load inputs when the PL (Parallel Load) pin is activated.
2. Serial Shift: Data can be shifted serially in and out of the registers via the DS (Serial Data Input) and the Clock pin.
3. Clock Signal: The Clock input controls the shifting of data through the registers.
4. Asynchronous Reset: The CLR (Clear) pin resets the registers to zero asynchronously, regardless of the clock signal.

Applications

• Data Storage: Used for temporary storage of data in digital circuits.
• Data Shifting: Facilitates shifting data serially for data manipulation and transfer.
• Digital Displays: Drives digital displays by shifting data to control segments or LEDs.
• Data Transfer: Assists in serial-to-parallel or parallel-to-serial data conversion.
• Communication Systems: Used in communication systems for serial data handling and processing.

Example Circuit

• Data Shift Register: Connect the IC to a data source and a display to shift and display data serially.
• Parallel-to-Serial Converter: Use the IC to convert parallel data into a serial stream for transmission.
• Data Storage Buffer: Implement the IC in a system to temporarily store and shift data for processing.

Advantages

• Dual Registers: Provides two independent shift registers for versatile applications.
• Static Operation: Maintains data without requiring a clock signal for data retention.
• Parallel and Serial Functions: Offers both parallel loading and serial shifting capabilities.
• Asynchronous Reset: Allows for immediate reset of the registers.
• Versatile Use: Suitable for various data handling and storage applications.

Conclusion

The IC 7475 is a reliable and versatile dual 4-bit static shift register designed for efficient data handling in digital circuits. With its capabilities for parallel loading, serial shifting, and asynchronous resetting, it is ideal for applications such as data storage, digital displays, and communication systems. Its dual register design and flexible operation make it a valuable component in many electronic systems.

IC 4085 – 8-Bit Serial-In/Parallel-Out Shift Register with 3-State Outputs