Overview
The SN74LS21NG4 is a dual 4-input positive-AND gate integrated circuit (IC) manufactured by Texas Instruments. This IC is part of the 74LS series, which is widely recognized for its low-power Schottky (LS) technology. The SN74LS21NG4 is designed to perform logical AND operations on two sets of four inputs, making it suitable for various digital logic applications. It is housed in a 14-pin DIP (Dual In-line Package) and operates within a temperature range of 0°C to 70°C. Its robust design and reliable performance make it a popular choice for industrial, automotive, and consumer electronics applications.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Logic Type | Positive-AND Gate | - | Dual 4-input |
| Supply Voltage | 4.75 to 5.25 | V | Standard TTL levels |
| Operating Temperature | 0 to 70 | °C | Commercial grade |
| Propagation Delay | 15 | ns | Typical at 5V |
| Package | PDIP-14 | - | Dual In-line Package |
| Output Current | 8 | mA | Low-level output |
Key Features
- Dual 4-input positive-AND gate functionality.
- Low power consumption due to Schottky technology.
- Wide operating voltage range (4.75V to 5.25V).
- High noise immunity for reliable operation in noisy environments.
- Standard TTL logic levels for compatibility with other logic families.
Applications
The SN74LS21NG4 is widely used in digital logic circuits, including but not limited to:
- Industrial automation systems for signal processing and control.
- Automotive electronics for vehicle control and monitoring.
- Consumer electronics for logic operations in devices like calculators and remote controls.
- Embedded systems for interfacing and logic implementation.
Q & A
1. What is the function of the SN74LS21NG4?
The SN74LS21NG4 is a dual 4-input positive-AND gate IC that performs logical AND operations on two sets of four inputs.
2. What is the operating voltage range of this IC?
The operating voltage range is 4.75V to 5.25V.
3. What is the maximum operating temperature?
The maximum operating temperature is 70°C.
4. What package type does the SN74LS21NG4 use?
It uses a 14-pin DIP (Dual In-line Package).
5. What is the typical propagation delay?
The typical propagation delay is 15ns at 5V.
6. Is the SN74LS21NG4 suitable for automotive applications?
Yes, it is suitable for automotive electronics due to its robust design and reliability.
7. Can this IC be used in industrial automation?
Yes, it is commonly used in industrial automation for signal processing and control.
8. What is the output current capability?
The low-level output current is 8mA.
9. Is the SN74LS21NG4 compatible with other logic families?
Yes, it uses standard TTL logic levels, making it compatible with other TTL logic families.
10. What is the primary advantage of using this IC?
The primary advantage is its low power consumption and high noise immunity, making it reliable for various applications.
