Encyclopedia Entry: 74AC11257DWR

Product Overview

Category

The 74AC11257DWR 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 74AC11257DWR is a quad 2-input multiplexer with three-state outputs.
• It operates on a supply voltage range of 2V to 6V, making it suitable for various electronic systems.
• This IC offers high-speed operation and low power consumption.
• It features Schmitt-trigger inputs, which provide hysteresis for improved noise immunity.
• The three-state outputs allow for easy connection to multiple devices without interference.

Package and Quantity

The 74AC11257DWR is available in a standard SOIC-24 package. Each package contains one IC.

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: 5ns (typical)
• Maximum Quiescent Current: 4μA

Pin Configuration

The pin configuration of the 74AC11257DWR is as follows:

+---+--+---+ A1 --|1 +--+ 24|-- VCC B1 --|2 23|-- A3 Y1 --|3 22|-- B3 A2 --|4 21|-- Y3 B2 --|5 20|-- A4 Y2 --|6 19|-- B4 GND --|7 18|-- Y4 AY --|8 17|-- OE# BY --|9 16|-- GND Y --|10 15|-- B A --|11 14|-- Y B --|12 13|-- A +----------+

Functional Features

• The 74AC11257DWR is designed to multiplex or demultiplex four data inputs (A1, A2, A3, A4) onto a single output (Y).
• It features two select inputs (B and A) that control the data routing.
• The output enable input (OE#) allows for three-state outputs, enabling multiple devices to share the same bus without interference.
• This IC provides high-speed operation, making it suitable for applications requiring fast data switching.

Advantages and Disadvantages

Advantages

• High-speed operation enables efficient data switching.
• Low power consumption makes it energy-efficient.
• Schmitt-trigger inputs provide improved noise immunity.
• Three-state outputs allow for easy bus sharing.

Disadvantages

• Limited number of inputs and outputs restricts its application in complex systems.
• Requires external components for proper voltage regulation and protection.

Working Principles

The 74AC11257DWR operates based on the principles of digital multiplexing and demultiplexing. It uses the select inputs (B and A) to determine which data input (A1, A2, A3, A4) is routed to the output (Y). The output enable input (OE#) controls the state of the outputs, allowing them to be either active or in a high-impedance state.

Application Field Plans

The 74AC11257DWR finds applications in various digital electronic systems, including: 1. Data communication systems 2. Multiplexed data transmission 3. Address decoding in memory systems 4. Data routing in microcontrollers 5. Bus sharing in computer peripherals

Alternative Models

Some alternative models to the 74AC11257DWR include: - 74HC11257: Similar functionality, but operates at a higher voltage range (2V to 6V). - CD4051: Analog multiplexer/demultiplexer with similar pin configuration. - SN74LS157: Quad 2-line to 1-line data selector/multiplexer.

These alternative models can be considered based on specific application requirements and compatibility with the existing system.

In conclusion, the 74AC11257DWR is a versatile integrated circuit used for data multiplexing and demultiplexing applications. Its high-speed operation, low power consumption, and three-state outputs make it suitable for various digital electronic systems. However, its limited number of inputs and outputs may restrict its use in complex systems.