SN74ALS251D

Product Overview

Category

SN74ALS251D belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital logic applications.

Characteristics

• High-speed operation
• Low power consumption
• Wide operating voltage range
• Multiple input/output options

Package

SN74ALS251D is available in a 16-pin dual in-line package (DIP).

Essence

The essence of SN74ALS251D lies in its ability to perform multiplexing functions in digital systems.

Packaging/Quantity

SN74ALS251D is typically packaged in reels or tubes, with quantities varying based on customer requirements.

Specifications

• Supply Voltage: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Logic Family: ALS
• Number of Inputs: 8
• Number of Outputs: 1
• Logic Type: Multiplexer
• Propagation Delay: 9ns (typical)
• Output Current: ±24mA

Detailed Pin Configuration

1. A0 (Input)
2. A1 (Input)
3. A2 (Input)
4. A3 (Input)
5. A4 (Input)
6. A5 (Input)
7. A6 (Input)
8. A7 (Input)
9. G (Input)
10. Y (Output)
11. E1 (Enable Input)
12. E2 (Enable Input)
13. E3 (Enable Input)
14. VCC (Power Supply)
15. GND (Ground)
16. NC (Not Connected)

Functional Features

SN74ALS251D is an 8-input multiplexer that allows the selection of one out of eight data inputs based on the control inputs. It features three enable inputs (E1, E2, and E3) that control the operation of the multiplexer. When all enable inputs are high, the multiplexer is enabled, and the selected input is transferred to the output (Y). The selection of the input is determined by the binary code applied to the address inputs (A0-A7).

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient data processing.
• Low power consumption makes it suitable for battery-powered devices.
• Wide operating voltage range provides flexibility in various applications.
• Multiple input/output options enhance versatility.

Disadvantages

• Limited number of outputs restricts the complexity of the system.
• Propagation delay may affect real-time applications with strict timing requirements.

Working Principles

SN74ALS251D operates based on the principles of digital multiplexing. It uses a combination of address inputs and enable inputs to select and transfer data from one of the eight inputs to the output. The internal circuitry ensures proper signal routing and data integrity.

Detailed Application Field Plans

SN74ALS251D finds applications in various digital systems, including but not limited to: - Data communication systems - Industrial automation - Instrumentation equipment - Consumer electronics - Automotive electronics

Detailed and Complete Alternative Models

1. SN74ALS253D: Dual 4-line to 1-line data selectors/multiplexers
2. SN74ALS257D: Quad 2-line to 1-line data selectors/multiplexers
3. SN74ALS259D: 8-bit addressable latches with 3-state outputs
4. SN74ALS244D: Octal buffers/drivers with 3-state outputs
5. SN74ALS138D: 3-line to 8-line decoders/demultiplexers

These alternative models offer similar functionality and can be considered as substitutes for SN74ALS251D in different applications.

In conclusion, SN74ALS251D is a versatile integrated circuit that performs multiplexing functions in digital systems. Its high-speed operation, low power consumption, and wide operating voltage range make it suitable for various applications. However, its limited number of outputs and propagation delay should be considered when designing real-time systems. Alternative models provide additional options with similar functionality.