Texas Instruments

SN74LS279AD

SN74LS279AD Description

The SN74LS279AD from Texas Instruments is a quad S-R (Set-Reset) latch integrated circuit housed in a 16-SOIC package. Designed for reliable digital logic applications, it operates within a 4.75V to 5.25V supply range, making it compatible with standard TTL (Transistor-Transistor Logic) systems. With a propagation delay of 12ns, it ensures fast signal processing, while its ROHS3 compliance and REACH unaffected status make it suitable for environmentally conscious designs. The device features four independent 1:1 latches, each capable of maintaining a stable output state until reset, ideal for sequential logic implementations.

SN74LS279AD Features

• Quad S-R Latches: Four independent latches in a single IC, reducing board space and complexity.
• TTL Compatibility: Operates at 5V with standard TTL logic levels, ensuring seamless integration.
• High-Speed Performance: 12ns propagation delay enables efficient real-time processing.
• Robust Output Drive: Supports 400µA (high) and 8mA (low) output currents, suitable for driving moderate loads.
• Surface-Mount Design: 16-SOIC package facilitates compact PCB layouts in space-constrained applications.
• Wide Operating Temperature: Functions reliably from 0°C to 70°C, suitable for commercial-grade electronics.
• Low Power Consumption: Optimized for energy-efficient designs, typical of the 74LS series.

SN74LS279AD Applications

• Data Storage Systems: Used in temporary data retention circuits, such as register banks.
• Control Logic Circuits: Ideal for debouncing switches or stabilizing control signals in embedded systems.
• Sequential Logic Designs: Employed in state machines, counters, and flip-flop-based timing circuits.
• Industrial Automation: Suitable for PLCs (Programmable Logic Controllers) requiring reliable latching functions.
• Consumer Electronics: Found in devices like gaming consoles and digital displays for signal conditioning.

Conclusion of SN74LS279AD

The SN74LS279AD is a versatile, high-performance quad S-R latch offering low power consumption, fast response times, and robust TTL compatibility. Its compact SOIC package and independent latch configuration make it a preferred choice for designers needing reliable digital storage solutions. While classified as Last Time Buy, its proven performance in data retention, control logic, and industrial systems ensures continued relevance in legacy and new designs. For engineers seeking a dependable latch IC with low propagation delay and strong output drive, the SN74LS279AD remains a compelling option.