SN74LS21NSR

Product Overview

Category

SN74LS21NSR belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronics for various applications such as logic gates, flip-flops, and counters.

Characteristics

• Low power consumption
• High-speed operation
• Wide operating voltage range
• Compatibility with TTL (Transistor-Transistor Logic) inputs and outputs

Package

SN74LS21NSR is available in a small-outline package (SOIC) with 14 pins.

Essence

The essence of SN74LS21NSR lies in its ability to perform logical operations and store data efficiently.

Packaging/Quantity

SN74LS21NSR is typically sold in reels containing a quantity of 2500 units per reel.

Specifications

• Supply Voltage: 4.75V to 5.25V
• Operating Temperature Range: -40°C to +85°C
• Logic Family: LS-TTL
• Number of Inputs: 2
• Number of Outputs: 1
• Propagation Delay Time: 9ns (max)
• Power Dissipation: 22mW (typ)

Detailed Pin Configuration

1. Input A
2. Input B
3. Ground (GND)
4. Output Y
5. Input C
6. Input D
7. VCC (+5V)
8. Input E
9. Input F
10. Input G
11. Input H
12. Input I
13. Input J
14. Not Connected (NC)

Functional Features

SN74LS21NSR is a dual 4-input positive AND gate. It performs logical AND operations on four input signals (A, B, C, D) and provides the output signal (Y) based on the logical combination of these inputs. The IC operates at high speed and is compatible with TTL logic levels.

Advantages and Disadvantages

Advantages

• Low power consumption makes it suitable for battery-powered devices.
• High-speed operation enables efficient data processing.
• Wide operating voltage range allows compatibility with various systems.
• Compatibility with TTL inputs and outputs simplifies integration into existing circuits.

Disadvantages

• Limited number of inputs and outputs restricts its application in complex systems.
• Propagation delay time may affect the overall performance in time-critical applications.

Working Principles

SN74LS21NSR works based on the principles of digital logic gates. It utilizes transistors and other electronic components to perform logical AND operations on the input signals. The output signal is determined by the logical combination of the input states, following the truth table for a 4-input AND gate.

Detailed Application Field Plans

SN74LS21NSR finds applications in various fields, including: 1. Digital circuit design 2. Microcontroller-based systems 3. Industrial automation 4. Communication systems 5. Robotics 6. Automotive electronics

Detailed and Complete Alternative Models

Some alternative models that can be used as replacements for SN74LS21NSR include: 1. SN74LS21D 2. SN74HC21N 3. CD4082BE 4. MC14082BCL 5. DM74LS21N

These alternatives offer similar functionality and can be selected based on specific requirements and availability.

In conclusion, SN74LS21NSR is a versatile integrated circuit belonging to the LS-TTL logic family. Its high-speed operation, low power consumption, and compatibility with TTL make it suitable for a wide range of digital applications. However, its limited number of inputs and outputs may restrict its use in complex systems.