SN74AS257DRG4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Selector/Multiplexer
• Characteristics: High-speed, low-power, 3-state outputs
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: A quad 2-input multiplexer with 3-state outputs
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Logic Family: AS
• Number of Inputs: 8 (2 inputs per multiplexer)
• Number of Outputs: 4 (1 output per multiplexer)
• Supply Voltage Range: 4.5V to 5.5V
• Propagation Delay Time: 9 ns (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The SN74AS257DRG4 has a 16-pin SOIC package with the following pin configuration:

__ __ Y1 |1 \__/ 16| Vcc Y2 |2 15| B Y3 |3 14| A Y4 |4 13| GND D1 |5 12| C D2 |6 11| Y4 G1 |7 10| Y3 GND |8 9| Y2 ‾‾ ‾‾

Functional Features

• Quad 2-input multiplexer: Allows selection between four different data inputs based on control inputs.
• 3-state outputs: The outputs can be put in a high-impedance state, allowing multiple devices to share a common bus.

Advantages and Disadvantages

Advantages: - High-speed operation: Suitable for applications requiring fast data selection. - Low-power consumption: Helps in reducing overall power requirements. - 3-state outputs: Enables efficient bus sharing.

Disadvantages: - Limited number of inputs and outputs: May not be suitable for applications requiring a higher number of inputs/outputs. - Restricted supply voltage range: Requires a specific voltage range for proper operation.

Working Principles

The SN74AS257DRG4 is a multiplexer IC that selects one of the four input signals based on the control inputs. The selected input is then routed to the output. The 3-state outputs allow multiple devices to share a common bus, enabling efficient data transfer.

Detailed Application Field Plans

The SN74AS257DRG4 can be used in various applications, including:

1. Data routing and selection in digital systems.
2. Address decoding in memory systems.
3. Bus switching and multiplexing in communication systems.
4. Input signal selection in industrial control systems.

Detailed and Complete Alternative Models

Some alternative models to the SN74AS257DRG4 are:

1. SN74LS257: Similar functionality but operates at a lower speed.
2. SN74HC257: Compatible with CMOS logic levels and has a wider supply voltage range.
3. CD4051: Analog multiplexer with similar characteristics but different pin configuration.

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