Encyclopedia Entry: 74AHCT257D,112

Product Overview

Category

The 74AHCT257D,112 belongs to the category of integrated circuits (ICs) and specifically falls under the family of multiplexers/demultiplexers.

Use

This product is commonly used in digital electronics for data routing and selection purposes. It acts as a quad 2-input multiplexer with 3-state outputs.

Characteristics

• High-speed operation
• Low power consumption
• Wide operating voltage range
• Schmitt-trigger action on all inputs
• Balanced propagation delays
• Symmetrical output impedance
• Overvoltage tolerant inputs
• Complies with JEDEC standard JESD8-B/JESD36

Package

The 74AHCT257D,112 is available in a small outline package (SOIC) with 16 pins.

Essence

The essence of this product lies in its ability to efficiently route and select digital signals, enabling effective data management in various electronic applications.

Packaging/Quantity

The 74AHCT257D,112 is typically packaged in reels or tubes, containing a quantity of 2500 units per reel/tube.

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: -0.5V to VCC + 0.5V
• Output Voltage Range: -0.5V to VCC + 0.5V
• Operating Temperature Range: -40°C to +125°C
• Input Capacitance: 3.5pF
• Output Capacitance: 6pF
• Propagation Delay: 7ns (max)
• Quiescent Current: 4μA (typ)

Detailed Pin Configuration

The 74AHCT257D,112 has 16 pins, labeled as follows:

1. A1 (Input)
2. B1 (Input)
3. Y1 (Output)
4. GND (Ground)
5. Y2 (Output)
6. B2 (Input)
7. A2 (Input)
8. Y3 (Output)
9. GND (Ground)
10. Y4 (Output)
11. B3 (Input)
12. A3 (Input)
13. GND (Ground)
14. OE (Output Enable)
15. VCC (Power Supply)
16. GND (Ground)

Functional Features

• Quad 2-input multiplexer with 3-state outputs
• Selects one of the four data inputs (A1, A2, A3, B3) based on the control input (OE)
• Output state can be set to high impedance by enabling the output enable (OE) pin
• Schmitt-trigger action on all inputs provides hysteresis for improved noise immunity
• Balanced propagation delays ensure accurate signal routing

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient data processing
• Low power consumption helps in reducing energy usage
• Wide operating voltage range enables compatibility with various systems
• Schmitt-trigger action on inputs enhances noise immunity
• Symmetrical output impedance simplifies circuit design
• Overvoltage tolerant inputs protect against voltage spikes
• Complies with industry standards for reliable performance

Disadvantages

• Limited number of inputs may restrict certain applications requiring more inputs
• Propagation delay of 7ns (max) may introduce slight latency in time-critical operations

Working Principles

The 74AHCT257D,112 operates based on the principles of digital multiplexing. It selects one of the four data inputs (A1, A2, A3, B3) based on the control input (OE). The selected input is then routed to the corresponding output pin (Y1, Y2, Y3, Y4). The output state can be set to high impedance by enabling the output enable (OE) pin, allowing multiple devices to share a common bus without interference.

Detailed Application Field Plans

The 74AHCT257D,112 finds applications in various fields, including:

1. Data communication systems
2. Digital signal processing
3. Industrial automation
4. Automotive electronics
5. Consumer electronics
6. Robotics and control systems
7. Instrumentation and measurement equipment

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the 74AHCT257D,112 include:

1. SN74HC257N
2. CD74HCT257E
3. MC74HCT257AD
4. 74LS257APC

These alternatives can be considered based on specific requirements and availability.

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