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Encyclopedia Entry: 74ACT251SC
Product Overview
Category
The 74ACT251SC belongs to the category of integrated circuits (ICs) and specifically falls under the family of multiplexers.
Use
This IC is primarily used for data selection and routing purposes in digital electronic systems. It allows multiple input signals to be selectively routed to a single output line, based on control inputs.
Characteristics
- High-speed operation: The 74ACT251SC is designed to operate at high clock frequencies, making it suitable for applications requiring fast data switching.
- Low power consumption: This IC is optimized for low power consumption, ensuring efficient operation in various electronic devices.
- Wide operating voltage range: It can operate within a wide voltage range, typically between 2V and 6V.
- Compatibility: The 74ACT251SC is compatible with both TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor) logic families.
Package and Quantity
The 74ACT251SC is available in a standard 16-pin small outline integrated circuit (SOIC) package. It is commonly supplied in reels or tubes, with quantities varying depending on the supplier.
Specifications
- Supply Voltage Range: 2V to 6V
- Input Voltage Range: 0V to Vcc
- Output Voltage Range: 0V to Vcc
- Operating Temperature Range: -40°C to +85°C
- Maximum Clock Frequency: 100 MHz
- Propagation Delay: 5 ns (typical)
Pin Configuration
The 74ACT251SC features a 16-pin configuration, with each pin serving a specific function. The detailed pinout is as follows:
Pin 1: A0
Pin 2: A1
Pin 3: A2
Pin 4: A3
Pin 5: A4
Pin 6: A5
Pin 7: GND (Ground)
Pin 8: Y
Pin 9: S0
Pin 10: S1
Pin 11: S2
Pin 12: S3
Pin 13: Vcc (Supply Voltage)
Pin 14: B0
Pin 15: B1
Pin 16: B2
Functional Features
The 74ACT251SC is a 8-input multiplexer with three control inputs (S0, S1, and S2). It allows the selection of one of the eight input lines (A0-A5, B0-B2) to be routed to the output line (Y), based on the binary combination applied to the control inputs.
Advantages and Disadvantages
Advantages: - High-speed operation enables efficient data switching. - Low power consumption ensures energy efficiency. - Wide operating voltage range provides flexibility in various applications. - Compatibility with TTL and CMOS logic families simplifies integration into existing systems.
Disadvantages: - Limited number of input lines (eight) may not suffice for complex applications requiring more inputs. - Propagation delay of 5 ns (typical) may introduce slight latency in time-critical applications.
Working Principles
The 74ACT251SC operates based on the principle of digital multiplexing. The control inputs (S0-S2) determine which input line (A0-A5, B0-B2) is connected to the output line (Y). By applying the appropriate binary combination to the control inputs, the desired input can be selected and routed to the output.
Application Field Plans
The 74ACT251SC finds application in various digital electronic systems, including but not limited to: - Data routing and selection in microprocessors and microcontrollers. - Address decoding in memory systems. - Signal routing in communication devices. - Input selection in audio/video equipment.
Alternative Models
For those seeking alternatives to the 74ACT251SC, several similar ICs are available in the market. Some notable alternatives include: - 74HC151: An 8-input multiplexer with similar characteristics and pin configuration. - CD4051: A 8-channel analog multiplexer/demultiplexer suitable for both digital and analog applications. - SN74LS157: A quad 2-line to 1-line data selector/multiplexer offering additional functionality.
These alternative models can be considered based on specific requirements and compatibility with existing systems.
In conclusion, the 74ACT251SC is a versatile integrated circuit used for data selection and routing purposes. Its high-speed operation, low power consumption, and wide voltage range make it suitable for various digital electronic applications. While it has certain limitations, such as the number of input lines and propagation delay, alternative models provide options for different needs.
10 domande e risposte comuni relative all'applicazione di 74ACT251SC nelle soluzioni tecniche
Sure! Here are 10 common questions and answers related to the application of 74ACT251SC in technical solutions:
Q: What is the 74ACT251SC? A: The 74ACT251SC is a multiplexer (MUX) IC (integrated circuit) that allows multiple input signals to be selected and routed to a single output.
Q: What is the purpose of using a multiplexer in a technical solution? A: Multiplexers are used to save space, reduce complexity, and improve efficiency by combining multiple input signals into a single output.
Q: How many inputs does the 74ACT251SC have? A: The 74ACT251SC has 8 inputs, labeled A0 to A7.
Q: What is the output configuration of the 74ACT251SC? A: The 74ACT251SC has a single output, labeled Y.
Q: Can the 74ACT251SC handle both analog and digital signals? A: No, the 74ACT251SC is designed to handle digital signals only.
Q: What is the voltage range supported by the 74ACT251SC? A: The 74ACT251SC supports a voltage range of 2V to 6V.
Q: How is the selection of input signals done in the 74ACT251SC? A: The 74ACT251SC has three select inputs (S0, S1, and S2) that determine which input signal is routed to the output.
Q: Can the 74ACT251SC be cascaded to increase the number of inputs? A: Yes, multiple 74ACT251SC ICs can be cascaded together to increase the number of inputs and create larger multiplexers.
Q: What is the maximum operating frequency of the 74ACT251SC? A: The 74ACT251SC can operate at a maximum frequency of 125 MHz.
Q: Are there any special considerations for power supply and grounding when using the 74ACT251SC? A: Yes, it is important to provide stable power supply and proper grounding to ensure reliable operation of the 74ACT251SC. Decoupling capacitors should be used to minimize noise and voltage fluctuations.
Please note that these answers are general and may vary depending on specific application requirements.