SN74AS21NSR

The SN74AS21NSR is a dual 4-input NAND gate integrated circuit (IC) manufactured by Texas Instruments. It belongs to the Advanced Schottky (AS) logic family, which is known for its high-speed performance and low power consumption. Here’s a detailed description of its features and specifications:

General Features:

• Functionality: The SN74AS21NSR contains two independent 4-input NAND gates. Each gate can take four input signals and produce a single output signal that is the logical NAND of the inputs.
• High-Speed Operation: The AS series is designed for high-speed applications, with propagation delays typically around 5 ns at a supply voltage of 5V.
• Low Power Consumption: The device operates with low power requirements, making it suitable for battery-operated devices and energy-efficient designs.

Electrical Characteristics:

• Supply Voltage (Vcc): The IC operates within a supply voltage range of 4.5V to 5.5V, making it compatible with standard TTL logic levels.
• Input Voltage Levels: The input high voltage (VIH) is typically 2.0V, while the input low voltage (VIL) is 0.8V, ensuring compatibility with various logic families.
• Output Drive Capability: The outputs can drive standard TTL loads, with a typical output high current (IOH) of -0.4 mA and output low current (IOL) of 16 mA.

Package Information:

• Package Type: The SN74AS21NSR is available in a surface-mount SOIC (Small Outline Integrated Circuit) package, which is compact and suitable for modern PCB designs.
• Pin Count: The IC has 14 pins, with specific pins designated for each of the two NAND gates, as well as power and ground connections.

Logic Functionality:

• NAND Gate Operation: The output of each NAND gate is low only when all its inputs are high. This makes it useful for implementing various logic functions and circuits, including flip-flops, counters, and more complex combinational logic.

Applications:

• Digital Logic Circuits: The SN74AS21NSR is widely used in digital logic applications, including arithmetic logic units (ALUs), multiplexers, and other combinational logic circuits.
• Signal Processing: It can be utilized in signal processing applications where high-speed logic operations are required.
• Consumer Electronics: Commonly found in consumer electronics, automotive systems, and industrial control systems due to its reliability and performance.

Additional Information:

• Temperature Range: The device is rated for operation over a temperature range of -40°C to +85°C, making it suitable for a variety of environments.
• RoHS Compliant: The SN74AS21NSR is compliant with the Restriction of Hazardous Substances (RoHS) directive, ensuring it is environmentally friendly.

In summary, the SN74AS21NSR from Texas Instruments is a versatile and high-performance dual 4-input NAND gate that is ideal for a wide range of digital logic applications, offering speed, efficiency, and reliability in a compact package.