The MM74LS299N is an 8-bit Universal Shift Register with 3-STATE outputs manufactured by Fairchild Semiconductor, now part of ON Semiconductor. This device features parallel inputs and outputs, as well as serial input and output capabilities, making it highly versatile for a wide range of digital logic applications.

Applications

• Data storage: It can be used as a temporary storage location for data in digital systems.
• Sequence generation: Its shift register functionality allows for the creation of specific digital sequences.
• Digital delay lines: By shifting data through the register, a controlled time delay can be introduced.
• Serial-to-parallel and parallel-to-serial data conversion: This capability makes it suitable for interfacing between systems with different data transmission formats.
• Arithmetic operations: Certain arithmetic functions, such as multiplication and division by powers of two, can be implemented using shift registers.

Features

• 8-bit bidirectional shift register: Allows data to be shifted in either direction.
• Parallel inputs and outputs: Provides easy access to all 8 bits simultaneously.
• 3-STATE outputs: Enables the outputs to be disconnected from the bus, allowing multiple devices to share the same bus lines.
• Asynchronous Master Reset: Clears the register to all zeros independently of the clock signal.
• J-K serial inputs: Offers versatile serial data input options.
• Low power consumption: Operates with a low power requirement, suitable for battery-powered applications.

Benefits

• Versatile functionality: The combination of parallel and serial capabilities provides flexibility in system design.
• Easy integration: The standard DIP package simplifies board layout and assembly.
• Reduced component count: The integrated 8-bit register reduces the need for discrete components.
• Improved system performance: The 3-STATE outputs minimize bus loading and improve signal integrity.
• Simplified data manipulation: Bidirectional shifting simplifies data handling tasks.

Additional Details

The MM74LS299N operates from a 5V power supply and is TTL compatible. The operating temperature range is typically 0°C to +70°C. It is available in a 20-pin DIP package. The logic levels are standard TTL levels, with a HIGH level typically above 2.0V and a LOW level below 0.8V. The maximum clock frequency is typically around 25 MHz. The device has a propagation delay of around 15 ns. The input loading factor is typically 1 LS TTL load. The device is commonly used in computer systems, data processing equipment, and control systems.