Overview
The SN74LS21N, manufactured by Texas Instruments, is a dual 4-input positive-AND gate integrated circuit (IC) designed for digital logic applications. This model is part of the LS series, known for its low power consumption and high-speed performance. The SN74LS21N is housed in a PDIP14 package, making it suitable for through-hole mounting. It is widely used in various digital systems where multiple input AND logic operations are required.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Manufacturer | Texas Instruments | - | - |
| Series | LS | - | Low power Schottky |
| Logic Type | AND Gate | - | Dual 4-input |
| Package | PDIP14 | - | Through-hole |
| Supply Voltage | 4.75 to 5.25 | V | - |
| Operating Temperature | 0 to 70 | °C | - |
| Propagation Delay | 15 | ns | Typical |
| High-Level Output Current | -0.4 | mA | - |
| Low-Level Output Current | 8 | mA | - |
| Mounting Type | Through Hole | - | - |
Key Features
- Dual 4-input AND gates for complex logic operations.
- Low power consumption typical of the LS series.
- High-speed performance with a typical propagation delay of 15 ns.
- Wide operating voltage range from 4.75V to 5.25V.
- Robust PDIP14 package suitable for through-hole mounting.
Applications
The SN74LS21N is extensively used in digital logic circuits where multiple input AND operations are necessary. Common applications include data processing systems, control units, and various digital logic operations in both consumer and industrial electronics. Its reliability and efficiency make it a preferred choice for designers looking to implement complex logic functions in their digital systems.
Q & A
1. What is the function of the SN74LS21N?
The SN74LS21N functions as a dual 4-input positive-AND gate, performing logical AND operations on four input signals simultaneously.
2. What is the operating voltage range for the SN74LS21N?
The operating voltage range for the SN74LS21N is from 4.75V to 5.25V.
3. What is the typical propagation delay of the SN74LS21N?
The typical propagation delay of the SN74LS21N is 15 nanoseconds.
4. What package does the SN74LS21N come in?
The SN74LS21N comes in a PDIP14 package, which is suitable for through-hole mounting.
5. What is the maximum operating temperature for the SN74LS21N?
The maximum operating temperature for the SN74LS21N is 70°C.
6. Can the SN74LS21N be used in industrial applications?
Yes, the SN74LS21N is suitable for both consumer and industrial digital logic applications.
7. What is the logic family of the SN74LS21N?
The SN74LS21N belongs to the LS (Low power Schottky) logic family.
8. How many AND gates are there in the SN74LS21N?
There are two 4-input AND gates in the SN74LS21N.
9. What is the high-level output current of the SN74LS21N?
The high-level output current of the SN74LS21N is -0.4 mA.
10. Is the SN74LS21N suitable for high-speed digital systems?
Yes, the SN74LS21N is designed for high-speed performance, making it suitable for high-speed digital systems.
