74HC21DB,118

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Logic Gate
• Characteristics: Dual 4-input AND gate
• Package: SOIC-14
• Essence: High-speed CMOS technology
• Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 2.0V to 6.0V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +125°C
• Propagation Delay Time: 10ns (typical)
• Maximum Quiescent Current: 1µA at 5.5V

Detailed Pin Configuration

The 74HC21DB,118 has a total of 14 pins arranged as follows:

__ __ 1 |1 \__/ 14| VCC 2 |2 13| A1 3 |3 12| B1 4 |4 11| Y1 5 |5 10| A2 6 |6 9| B2 7 |7 8| Y2 ‾‾‾‾‾‾‾‾‾

Functional Features

• Dual 4-input AND gate with independent inputs and outputs
• High-speed operation due to the use of CMOS technology
• Low power consumption
• Wide supply voltage range allows for compatibility with various systems
• Schmitt-trigger action on all inputs ensures noise immunity

Advantages and Disadvantages

Advantages: - High-speed operation enables efficient processing of logic signals - Low power consumption makes it suitable for battery-powered devices - Wide supply voltage range provides flexibility in different applications - Noise immunity due to Schmitt-trigger action ensures reliable operation

Disadvantages: - Limited number of inputs (4 per gate) - May not be suitable for complex logic operations requiring more inputs

Working Principles

The 74HC21DB,118 is a dual 4-input AND gate that performs logical AND operations on its inputs. It utilizes high-speed CMOS technology, which allows for fast and efficient processing of logic signals. The inputs and outputs are independent, providing flexibility in connecting multiple gates together.

The gate operates by comparing the logic levels of its inputs and producing an output based on the AND function. When all four inputs are high (logic level 1), the output will be high. Otherwise, the output will be low (logic level 0).

Detailed Application Field Plans

The 74HC21DB,118 can be used in various digital logic applications, including but not limited to:

1. Microprocessor-based systems: It can be used as a building block for implementing complex logic functions in microcontrollers or microprocessors.
2. Data communication systems: It can be utilized for signal conditioning, data routing, and protocol implementation in communication systems.
3. Industrial automation: It can be employed in control systems, PLCs (Programmable Logic Controllers), and robotics for logical decision-making.
4. Automotive electronics: It can be integrated into automotive control units for performing logic operations in vehicle systems.
5. Consumer electronics: It can be used in devices such as TVs, DVD players, and gaming consoles for various logic functions.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the 74HC21DB,118 include:

1. SN74LS21N: Dual 4-input AND gate with TTL compatibility
2. CD4082BE: Dual 4-input AND gate with CMOS technology
3. MC14081B: Quad 2-input AND gate with CMOS technology

These alternative models can be considered based on specific requirements, availability, and compatibility with existing systems.

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