DM74ALS21AN

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Logic Gate
• Characteristics: High-speed, TTL-compatible, dual 4-input AND gate
• Package: DIP (Dual In-line Package)
• Essence: Digital logic component for logical AND operations
• Packaging/Quantity: Typically sold in tubes of 25 or reels of 1000 units

Specifications

• Manufacturer: Fairchild Semiconductor
• Logic Family: ALS
• Logic Type: TTL (Transistor-Transistor Logic)
• Number of Inputs: 4
• Number of Gates: 2
• Supply Voltage: 4.75V to 5.25V
• Propagation Delay: 9ns (typical)
• Operating Temperature Range: -55°C to 125°C

Detailed Pin Configuration

The DM74ALS21AN has a total of 14 pins arranged as follows:

__ __ 1 |1 \__/ 14| VCC 2 |2 13| Output Y1 3 |3 12| Input A4 4 |4 11| Input B4 5 |5 10| Output Y2 6 |6 9| Input A3 7 |7 8| Input B3 |_________|

Functional Features

• Dual 4-input AND gate: The DM74ALS21AN contains two independent AND gates, each capable of accepting four input signals and producing a single output.
• High-speed operation: This IC is designed for high-speed applications, making it suitable for use in various digital systems.
• TTL compatibility: The DM74ALS21AN is compatible with other TTL logic devices, allowing for easy integration into existing circuits.
• Low power consumption: The ALS logic family is known for its low power consumption, making the DM74ALS21AN energy-efficient.

Advantages and Disadvantages

Advantages: - High-speed operation enables efficient processing of input signals. - TTL compatibility allows for seamless integration with other TTL logic devices. - Low power consumption reduces energy usage and heat dissipation.

Disadvantages: - Limited number of gates per IC may require multiple components for complex logic operations. - Propagation delay of 9ns may introduce timing issues in certain applications.

Working Principles

The DM74ALS21AN operates based on the principles of digital logic. It performs logical AND operations on the input signals and produces an output signal based on the combination of inputs. The TTL circuitry ensures reliable and accurate logic operations while maintaining compatibility with other TTL devices.

Detailed Application Field Plans

The DM74ALS21AN can be used in various applications that require logical AND operations. Some potential application fields include: - Digital signal processing - Microprocessor systems - Data communication systems - Industrial control systems - Automotive electronics

Detailed and Complete Alternative Models

• SN74ALS21N (Texas Instruments)
• MC74ALS21N (Motorola)
• CD54ALS21/BCAJC (Harris Corporation)
• HD74ALS21P (Hitachi)

These alternative models offer similar functionality to the DM74ALS21AN and can be used as replacements or substitutes depending on availability and specific requirements.

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