Encyclopedia Entry: 74AC257PC

Product Overview

Category

The 74AC257PC belongs to the category of integrated circuits (ICs) and specifically falls under the family of digital multiplexers.

Use

This IC is primarily used for data selection and routing purposes in various electronic applications.

Characteristics

• The 74AC257PC is a quad 2-input multiplexer with 3-state outputs.
• It operates on a supply voltage range of 2V to 6V, making it compatible with a wide range of systems.
• This IC offers high-speed operation and low power consumption, making it suitable for use in power-sensitive applications.
• It features 3-state outputs, allowing multiple devices to share a common bus without interference.

Package and Quantity

The 74AC257PC is available in a 16-pin DIP (Dual In-line Package) format. It is commonly sold in packs of 10 or more.

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 Propagation Delay: 8 ns
• Maximum Power Dissipation: 500 mW

Pin Configuration

The 74AC257PC has 16 pins arranged as follows:

+---\/---+ A1 --|1 16|-- Vcc B1 --|2 15|-- B2 C1 --|3 14|-- C2 D1 --|4 13|-- D2 G1 --|5 12|-- G2 Y1 --|6 11|-- Y2 GND --|7 10|-- GND A2 --|8 9|-- B3 +--------+

Functional Features

• The 74AC257PC has four independent 2-input multiplexers, allowing for simultaneous data selection and routing.
• It offers 3-state outputs, enabling the sharing of a common bus without interference.
• This IC provides high-speed operation, making it suitable for applications requiring quick data switching.

Advantages and Disadvantages

Advantages

• Wide supply voltage range allows compatibility with various systems.
• Low power consumption makes it suitable for power-sensitive applications.
• High-speed operation enables quick data switching.

Disadvantages

• Limited number of inputs and outputs compared to other multiplexer ICs.
• Not suitable for applications requiring a large number of data inputs.

Working Principles

The 74AC257PC operates based on the principles of digital multiplexing. It selects one of the multiple input signals and routes it to the output based on the control inputs. The 3-state outputs allow the device to be effectively disconnected from the bus when not in use, preventing signal interference.

Application Field Plans

The 74AC257PC finds application in various electronic systems, including: 1. Data communication systems 2. Digital audio equipment 3. Industrial automation 4. Automotive electronics 5. Consumer electronics

Alternative Models

Some alternative models that can be used as substitutes for the 74AC257PC include: - 74HC257: Similar functionality but operates at a higher voltage range (2V to 6V). - CD4051: Offers more input/output channels but operates at a lower speed.

In conclusion, the 74AC257PC is a versatile quad 2-input multiplexer IC that provides high-speed operation, low power consumption, and 3-state outputs. Its wide range of applications and availability in a standard DIP package make it a popular choice among electronic designers and hobbyists.

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