Encyclopedia Entry: 74F251ASCX

Product Overview

Category

The 74F251ASCX belongs to the category of integrated circuits (ICs) and specifically falls under the family of digital multiplexers.

Use

This product is primarily used in digital electronic systems for data selection and routing purposes. It allows multiple input signals to be selectively routed to a single output line, based on control inputs.

Characteristics

• The 74F251ASCX is a high-speed, quad 2-input multiplexer.
• It operates on a supply voltage range of 4.5V to 5.5V.
• This IC offers low power consumption and high noise immunity.
• It is designed to work in a wide temperature range, making it suitable for various applications.

Package and Quantity

The 74F251ASCX is available in a small outline integrated circuit (SOIC) package. Each package contains one unit of the IC.

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: 0V to Vcc
• Output Voltage Range: 0V to Vcc
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 7 ns (typical)
• Maximum Operating Frequency: 100 MHz

Pin Configuration

The 74F251ASCX has a total of 16 pins, which are assigned specific functions as follows:

1. A0: Input A0
2. B0: Input B0
3. I0: Control Input I0
4. I1: Control Input I1
5. GND: Ground
6. Y: Output Y
7. Vcc: Power Supply
8. B1: Input B1
9. A1: Input A1
10. I2: Control Input I2
11. I3: Control Input I3
12. Y: Output Y
13. GND: Ground
14. A2: Input A2
15. B2: Input B2
16. B3: Input B3

Functional Features

• The 74F251ASCX offers four independent 2-input multiplexers in a single package.
• It allows the selection of one out of four input lines to be routed to the output line based on the control inputs.
• The IC operates at high speed, making it suitable for time-critical applications.
• It provides low power consumption, ensuring efficient energy usage.
• The 74F251ASCX exhibits high noise immunity, enabling reliable operation in noisy environments.

Advantages and Disadvantages

Advantages

• High-speed operation enables quick data selection and routing.
• Low power consumption ensures energy efficiency.
• High noise immunity allows reliable performance in noisy conditions.
• Compact SOIC package facilitates easy integration into electronic systems.

Disadvantages

• Limited to quad 2-input multiplexing functionality.
• Requires external control inputs for proper operation.

Working Principles

The 74F251ASCX operates by utilizing the control inputs (I0, I1, I2, I3) to select one of the four input lines (A0, A1, A2, B0, B1, B2, B3) to be connected to the output line (Y). The selected input is determined by the binary value applied to the control inputs. The IC uses internal logic gates and switches to achieve this functionality.

Application Field Plans

The 74F251ASCX finds application in various digital electronic systems, including but not limited to: - Data multiplexing in microprocessors and microcontrollers. - Address decoding in memory systems. - Signal routing in communication systems. - Input selection in data acquisition systems.

Alternative Models

Several alternative models with similar functionality to the 74F251ASCX are available in the market. Some notable alternatives include: - SN74LS157: Quad 2-input multiplexer with Schottky-clamped inputs. - CD4053B: Triple 2-channel analog multiplexer/demultiplexer. - MC14051B: 8-channel analog multiplexer/demultiplexer.

These alternative models offer similar features and can be used as substitutes depending on specific application requirements.

In conclusion, the 74F251ASCX is a high-speed quad 2-input multiplexer IC that finds application in various digital electronic systems. Its compact package, low power consumption, and high noise immunity make it a versatile choice for data selection and routing tasks.

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