Overview
The SN74HC21D is a dual 4-input AND gate integrated circuit (IC) manufactured by Texas Instruments. It belongs to the 74HC series of high-speed CMOS logic devices, designed to offer a balance between speed and low power consumption. This IC is housed in a SOIC-14 package, making it suitable for surface-mount applications. The SN74HC21D is widely used in digital logic circuits where multiple inputs need to be logically ANDed together. Its compatibility with CMOS and TTL logic levels, along with its robust performance across a wide voltage range (2V to 6V), makes it a versatile choice for various electronic designs.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Manufacturer | Texas Instruments | - | - |
| Series | 74HC | - | - |
| Logic Type | AND Gate | - | Dual 4-input |
| Package | SOIC-14 | - | Surface Mount |
| Supply Voltage | 2.00 ~ 6.00 | V | - |
| Output Current | 5.2 | mA | - |
| Propagation Delay | 140 | ns | - |
| Number of Circuits | 2 | - | - |
| Number of Inputs | 4 | - | Per Gate |
| Operating Temperature | -40 ~ 85 | °C | - |
| Dimensions | 8.65 x 3.91 x 1.58 | mm | Length x Width x Height |
Key Features
- High-speed CMOS logic with low power consumption.
- Wide operating voltage range (2V to 6V).
- Compatible with both CMOS and TTL logic levels.
- Dual 4-input AND gate configuration.
- Robust performance in harsh environments with an operating temperature range of -40°C to 85°C.
Applications
The SN74HC21D is commonly used in digital logic circuits, such as in microcontrollers, data processing systems, and communication devices. Its ability to handle multiple inputs makes it ideal for applications requiring logical AND operations, such as signal conditioning, control systems, and combinatorial logic circuits. Additionally, its low power consumption and high-speed performance make it suitable for battery-powered devices and high-frequency applications.
Q & A
1. What is the operating voltage range of the SN74HC21D?
The SN74HC21D operates within a voltage range of 2V to 6V.
2. What is the package type of the SN74HC21D?
It comes in a SOIC-14 package.
3. How many AND gates are included in the SN74HC21D?
The SN74HC21D contains two independent 4-input AND gates.
4. What is the maximum output current of the SN74HC21D?
The maximum output current is 5.2 mA.
5. What is the propagation delay of the SN74HC21D?
The typical propagation delay is 140 ns.
6. Is the SN74HC21D compatible with TTL logic levels?
Yes, it is compatible with both CMOS and TTL logic levels.
7. What is the operating temperature range of the SN74HC21D?
It can operate in temperatures ranging from -40°C to 85°C.
8. Can the SN74HC21D be used in battery-powered devices?
Yes, its low power consumption makes it suitable for battery-powered applications.
9. What are the typical applications of the SN74HC21D?
It is used in digital logic circuits, signal conditioning, control systems, and combinatorial logic circuits.
10. What is the logic type of the SN74HC21D?
It is a dual 4-input AND gate.
