SN74HCT257N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Selector/Multiplexer
• Characteristics: High-speed, CMOS logic, 4-to-1 multiplexer
• Package: DIP-16 (Dual In-line Package with 16 pins)
• Essence: Logic gate that selects one of four input data lines and routes it to a single output line
• Packaging/Quantity: Available in tubes or reels, typically sold in quantities of 25 or 50 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: 15 ns (typical)

Detailed Pin Configuration

The SN74HCT257N has 16 pins arranged as follows:

__ __ A1 -| 1 16 |- VCC B1 -| 2 15 |- Y A2 -| 3 14 |- B B2 -| 4 13 |- C A3 -| 5 12 |- D B3 -| 6 11 |- GND A4 -| 7 10 |- E B4 -| 8 9 |- F --------

Functional Features

• 4-to-1 Data Selector: Allows selection of one out of four input data lines
• Multiplexer: Routes the selected input data line to the output line
• High-Speed Operation: Suitable for applications requiring fast data switching
• CMOS Logic: Low power consumption and wide voltage range compatibility

Advantages and Disadvantages

Advantages: - High-speed operation enables efficient data selection and routing - CMOS logic ensures low power consumption - Wide supply voltage range allows compatibility with various systems

Disadvantages: - Limited to 4-to-1 multiplexing, not suitable for larger-scale applications - DIP-16 package may require additional space compared to surface-mount alternatives

Working Principles

The SN74HCT257N operates based on the principles of digital logic. It uses internal circuitry to select one of the four input data lines based on the control inputs (A and B). The selected data line is then routed to the output pin (Y). The device operates at high speed due to its CMOS technology, allowing for efficient data selection and transmission.

Detailed Application Field Plans

The SN74HCT257N finds applications in various fields, including:

1. Data Multiplexing: Used to select and route different data sources to a single output line.
2. Address Decoding: Enables decoding of address signals in microprocessor-based systems.
3. Data Routing: Facilitates switching between multiple data sources in communication systems.
4. Control Systems: Utilized for selecting control signals in automated systems.

Detailed and Complete Alternative Models

1. CD74HC157E: Similar 4-to-1 multiplexer IC with identical pin configuration and characteristics.
2. MC74HCT257AN: Another 4-to-1 multiplexer IC with comparable specifications and package type.
3. 74LS157N: A TTL logic alternative with similar functionality but different voltage requirements.

These alternative models can be considered based on specific project requirements and availability.

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