Xem thông số kỹ thuật để biết chi tiết sản phẩm.
DM74ALS251M
Product Overview
- Category: Integrated Circuit (IC)
- Use: Logic Multiplexer
- Characteristics: High-speed, TTL compatible, 8-input multiplexer
- Package: 16-pin SOIC (Small Outline Integrated Circuit)
- Essence: Combines multiple input signals into a single output signal
- Packaging/Quantity: Available in reels of 2500 units
Specifications
- Logic Family: Advanced Low-Power Schottky (ALS)
- Number of Inputs: 8
- Number of Outputs: 1
- Supply Voltage: 4.75V to 5.25V
- Operating Temperature Range: -40°C to +85°C
- Propagation Delay: 9ns (typical)
- Output Current: ±24mA
- Input Current: ±24mA
- Power Dissipation: 500mW (max)
Detailed Pin Configuration
The DM74ALS251M has the following pin configuration:
| Pin No. | Name | Description | |---------|------|-------------| | 1 | A0 | Input A0 | | 2 | A1 | Input A1 | | 3 | A2 | Input A2 | | 4 | A3 | Input A3 | | 5 | A4 | Input A4 | | 6 | A5 | Input A5 | | 7 | A6 | Input A6 | | 8 | A7 | Input A7 | | 9 | GND | Ground | | 10 | Y | Output Y | | 11 | E1 | Enable 1 | | 12 | E2 | Enable 2 | | 13 | E3 | Enable 3 | | 14 | VCC | Power Supply| | 15 | NC | Not Connected| | 16 | NC | Not Connected|
Functional Features
- Combines any one of the eight input signals to the output based on the enable inputs.
- High-speed operation allows for efficient signal multiplexing.
- TTL compatible inputs and outputs ensure compatibility with other logic devices.
- Low power consumption makes it suitable for battery-powered applications.
Advantages and Disadvantages
Advantages
- Fast propagation delay enables quick signal processing.
- Wide operating temperature range allows for use in various environments.
- TTL compatibility simplifies integration with existing systems.
- Low power dissipation reduces energy consumption.
Disadvantages
- Limited number of inputs may not be sufficient for complex applications.
- Availability in only one package type may limit flexibility in certain designs.
Working Principles
The DM74ALS251M is a multiplexer that selects one of the eight input signals (A0-A7) based on the enable inputs (E1-E3). The selected input is then routed to the output pin (Y). The device operates using advanced low-power Schottky (ALS) technology, which provides high-speed performance while maintaining compatibility with TTL logic levels.
Detailed Application Field Plans
The DM74ALS251M can be used in various applications, including:
- Data communication systems: Multiplexing multiple data streams onto a single transmission line.
- Industrial control systems: Selecting different sensor inputs for monitoring and control purposes.
- Audio/video equipment: Switching between multiple audio or video sources.
- Computer systems: Routing different signals within the system, such as address or data lines.
- Test and measurement instruments: Selecting different input signals for analysis or processing.
Detailed and Complete Alternative Models
- SN74ALS251: Similar 8-input multiplexer from Texas Instruments.
- CD74ALS251: 8-input multiplexer from National Semiconductor.
- MC74ALS251: 8-input multiplexer from Motorola.
These alternative models offer similar functionality and can be considered as substitutes for the DM74ALS251M based on specific requirements and availability.
Word count: 529 words
Liệt kê 10 câu hỏi và câu trả lời thường gặp liên quan đến ứng dụng DM74ALS251M trong giải pháp kỹ thuật
Sure! Here are 10 common questions and answers related to the application of DM74ALS251M in technical solutions:
Q: What is DM74ALS251M? A: DM74ALS251M is a multiplexer IC (Integrated Circuit) that allows multiple input signals to be selected and routed to a single output.
Q: What is the purpose of using DM74ALS251M in technical solutions? A: DM74ALS251M is commonly used in digital systems to save space, reduce complexity, and simplify signal routing by consolidating multiple inputs into a single output.
Q: How many inputs can DM74ALS251M handle? A: DM74ALS251M has 8 input channels, which means it can handle up to 8 different input signals.
Q: What is the output configuration of DM74ALS251M? A: DM74ALS251M has a single output line that can be connected to the desired destination based on the selected input.
Q: Can DM74ALS251M handle both analog and digital signals? A: No, DM74ALS251M is designed specifically for digital signals and is not suitable for handling analog signals.
Q: What is the voltage range supported by DM74ALS251M? A: DM74ALS251M operates with a voltage range of 2V to 6V, making it compatible with standard TTL (Transistor-Transistor Logic) levels.
Q: How does DM74ALS251M select the desired input signal? A: DM74ALS251M uses control inputs to determine which input channel to route to the output. The selection is made based on the binary value applied to these control inputs.
Q: Can DM74ALS251M be cascaded to handle more than 8 inputs? A: Yes, multiple DM74ALS251M ICs can be cascaded together to handle a larger number of input signals. The output of one multiplexer can be connected to the input of another.
Q: What is the propagation delay of DM74ALS251M? A: The propagation delay of DM74ALS251M is typically around 10-15 nanoseconds, which determines the time it takes for the selected input to appear at the output.
Q: Are there any specific precautions to consider when using DM74ALS251M? A: It is important to ensure that the power supply voltage and signal levels are within the specified range. Additionally, proper decoupling capacitors should be used to minimize noise and stabilize the operation of the IC.
Please note that these answers are general and may vary depending on the specific datasheet and manufacturer's guidelines for DM74ALS251M.