Encyclopedia Entry: 74AC251MTCX

Product Overview

Category

The 74AC251MTCX belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronic systems for data multiplexing and demultiplexing applications.

Characteristics

• The 74AC251MTCX is a quad 2-input multiplexer with three-state outputs.
• It operates on a supply voltage range of 2V to 6V.
• This IC offers high-speed operation and low power consumption.
• It is designed to be compatible with TTL (Transistor-Transistor Logic) inputs.

Package

The 74AC251MTCX is available in a small outline surface mount package (TSSOP-16).

Essence

The essence of the 74AC251MTCX lies in its ability to efficiently select one of four input signals and route it to a single output line.

Packaging/Quantity

This IC is typically sold in reels or tubes, with each reel containing 2500 units.

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
• Propagation Delay Time: 5.5 ns (max)
• Output Current: ±24 mA

Detailed Pin Configuration

The 74AC251MTCX has a total of 16 pins arranged as follows:

+---+--+---+ A1 --|1 +--+ 16|-- VCC B1 --|2 15|-- Y C1 --|3 14|-- S0 D1 --|4 13|-- S1 A2 --|5 12|-- S2 B2 --|6 11|-- GND C2 --|7 10|-- B1 D2 --|8 9|-- B2 +----------+

Functional Features

• The 74AC251MTCX offers four independent 2-input multiplexers in a single package.
• It provides three-state outputs, allowing multiple devices to be connected to the same output line without interference.
• This IC has built-in protection against electrostatic discharge (ESD), ensuring its reliability in various environments.

Advantages and Disadvantages

Advantages

• High-speed operation enables efficient data processing.
• Low power consumption contributes to energy efficiency.
• Compatibility with TTL inputs allows for easy integration into existing systems.
• Three-state outputs facilitate bus sharing and reduce signal conflicts.

Disadvantages

• Limited input/output options compared to more complex multiplexer ICs.
• Propagation delay may affect real-time applications requiring immediate response.

Working Principles

The 74AC251MTCX operates based on the principles of digital logic. It uses internal circuitry to select one of the four input signals based on the control inputs (S0, S1, S2). The selected input is then routed to the output pin (Y). The three-state outputs allow the device to disconnect from the output line when not actively driving it, preventing signal interference.

Detailed Application Field Plans

The 74AC251MTCX finds applications in various fields, including:

1. Data communication systems: Used for multiplexing and demultiplexing data signals in networking equipment.
2. Industrial automation: Enables efficient control signal routing in programmable logic controllers (PLCs).
3. Consumer electronics: Integrated into audio/video equipment for signal selection and routing.
4. Automotive electronics: Utilized in vehicle control systems for signal processing and routing.

Detailed and Complete Alternative Models

1. 74HC251: Similar functionality, but operates at a wider supply voltage range (2V to 6V).
2. CD4051B: Offers eight channels instead of four, suitable for applications requiring more input/output options.
3. SN54/74LS151: Compatible with TTL inputs, but operates at a slower speed compared to the 74AC251MTCX.

In conclusion, the 74AC251MTCX is a versatile integrated circuit that provides efficient data multiplexing and demultiplexing capabilities. Its high-speed operation, low power consumption, and compatibility with TTL inputs make it a popular choice in various digital electronic systems.