SN74AS257D

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Selector/Multiplexer
• Characteristics:
  • High-speed operation
  • Low power consumption
  • Wide operating voltage range
  • Multiple package options available
• Package: Dual In-Line Package (DIP)
• Essence: SN74AS257D is a quad 2-input multiplexer with 3-state outputs.
• Packaging/Quantity: Available in tubes or reels, quantity varies based on supplier.

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: 9ns (typical)
• Output Current: ±24mA
• Input Capacitance: 10pF
• Power Dissipation: 500mW (max)

Detailed Pin Configuration

The SN74AS257D has a total of 16 pins arranged as follows:

+---+--+---+ A1 --|1 +--+ 16|-- VCC B1 --|2 15|-- Y1 A2 --|3 14|-- Y2 B2 --|4 13|-- Y3 E --|5 74AS 12|-- Y4 Y --|6 257D 11|-- GND GND --|7 10|-- B1 Y4 --|8 9|-- A1 +----------+

Functional Features

• Quad 2-input multiplexer with 3-state outputs
• Allows selection of one out of four data inputs
• Output can be enabled or disabled using the Enable (E) pin
• High-speed operation allows for efficient data selection

Advantages and Disadvantages

Advantages: - High-speed operation enables quick data selection - Low power consumption helps conserve energy - Wide operating voltage range provides flexibility in various applications - Multiple package options allow for easy integration into different circuit designs

Disadvantages: - Limited to 2-input multiplexing, not suitable for more complex data selection tasks - Propagation delay time may affect real-time applications with strict timing requirements

Working Principles

The SN74AS257D is a multiplexer that selects one of four data inputs based on the control signals applied to its select inputs (A1, A2, B1, B2). The selected data is then routed to the output pins (Y1, Y2, Y3, Y4). The Enable (E) pin controls whether the outputs are active or in a high-impedance state.

Detailed Application Field Plans

The SN74AS257D is commonly used in various digital systems where multiple data sources need to be selectively connected to a single output. Some application fields include:

1. Data communication systems: Used for data routing and switching in networking equipment.
2. Industrial automation: Enables selection of different sensor inputs for monitoring and control purposes.
3. Audio/video equipment: Allows switching between different audio/video sources in home entertainment systems.
4. Automotive electronics: Used in vehicle control units for selecting various sensor inputs.

Detailed and Complete Alternative Models

1. SN74LS257: Similar quad 2-input multiplexer with 3-state outputs, operates at lower power supply voltage.
2. CD4052: Dual 4-channel analog multiplexer/demultiplexer, suitable for both digital and analog signal routing.
3. MC14051B: 8-channel analog multiplexer/demultiplexer, provides higher input/output options for complex data selection tasks.

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