onsemi

SN74LS299N

SN74LS299N Description

The SN74LS299N is an 8-bit universal shift/storage register from onsemi's 74LS series, designed for high-performance digital systems. This through-hole mounted IC operates within a 4.75V to 5.25V supply range and is optimized for 0°C to 70°C environments. As a single-element, 8-bit shift register, it integrates parallel and serial data handling with bidirectional shifting capabilities, making it highly versatile for data manipulation tasks. The device is classified under EAR99 and HTSUS 8542.39.0001, indicating its compliance with export and trade regulations. Though marked obsolete, it remains a reliable choice for legacy systems and specific industrial applications.

SN74LS299N Features

• Universal Functionality: Supports parallel load, serial shift (left/right), and hold modes, enabling flexible data flow control.
• Bidirectional Operation: Allows left or right shifting for efficient data reordering.
• Wide Operating Voltage: 4.75V–5.25V range ensures compatibility with standard TTL logic levels.
• High-Speed Performance: Typical propagation delay of 15ns (max) at 5V, suitable for time-critical applications.
• Integrated Clear Function: Features a master reset to initialize the register.
• Compact 20-Pin DIP Package: Facilitates easy integration into breadboards and through-hole PCBs.

SN74LS299N Applications

• Data Buffering: Ideal for temporary storage in microprocessor systems.
• Serial-to-Parallel Conversion: Used in communication interfaces (e.g., UART, SPI) to deserialize incoming data.
• Arithmetic Operations: Enables barrel shifting in ALUs for binary multiplication/division.
• Industrial Control Systems: Deployed in PLC modules for signal routing and delay generation.
• Legacy Equipment Maintenance: A cost-effective solution for repairing/upgrading older test instruments or embedded controllers.

Conclusion of SN74LS299N

The SN74LS299N stands out for its bidirectional shifting, parallel load capability, and robust TTL compatibility, making it a versatile choice despite its obsolete status. Its ease of integration and reliable performance in data processing and control systems ensure continued relevance in niche applications. Engineers working with retrofit designs or legacy hardware will find this shift register a pragmatic solution for efficient data handling without requiring modern, complex alternatives.