DM74AS21MX

Product Overview

• Category: Integrated Circuit (IC)
• Use: Logic Gates
• Characteristics: High-speed, Dual 4-input AND Gate
• Package: 14-pin Ceramic Dual Inline Package (CDIP)
• Essence: The DM74AS21MX is a high-speed integrated circuit that combines two 4-input AND gates in a single package.
• Packaging/Quantity: Available in tubes or reels, with a quantity of 25 units per tube/reel.

Specifications

• Supply Voltage: 4.75V to 5.25V
• Input Voltage: 0V to VCC
• Operating Temperature: -55°C to +125°C
• Propagation Delay: 9ns (typical)
• Output Current: ±8mA
• Power Dissipation: 500mW (max)

Pin Configuration

The DM74AS21MX has a total of 14 pins, which are numbered as follows:

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| | | 1 2 3 4 5 6 7 8 | | X | | 9 10 11 12 13 14 |

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• Pins 1 and 2: Input A1 and A2 for the first AND gate
• Pins 3 and 4: Input B1 and B2 for the first AND gate
• Pins 5 and 6: Output Y1 and Y2 for the first AND gate
• Pins 8 and 9: Input A3 and A4 for the second AND gate
• Pins 10 and 11: Input B3 and B4 for the second AND gate
• Pins 12 and 13: Output Y3 and Y4 for the second AND gate
• Pin 14: Ground (GND)

Functional Features

• High-speed operation allows for quick signal processing.
• Dual 4-input AND gates provide flexibility in logic circuit design.
• Compatible with various TTL families, making it versatile for different applications.
• Wide operating temperature range enables usage in extreme environments.

Advantages and Disadvantages

Advantages: - High-speed operation improves overall system performance. - Dual 4-input AND gates offer design flexibility. - Compatibility with different TTL families enhances versatility.

Disadvantages: - Limited number of inputs per gate may restrict complex logic operations. - Higher power dissipation compared to newer IC technologies.

Working Principles

The DM74AS21MX is based on transistor-transistor logic (TTL) technology. It utilizes multiple transistors and diodes to implement the logical AND function. When all input signals are high, the output becomes high; otherwise, the output remains low.

Detailed Application Field Plans

The DM74AS21MX can be used in various applications that require logical AND operations, such as:

1. Digital signal processing systems
2. Arithmetic logic units (ALUs)
3. Data multiplexers
4. Address decoders
5. Control circuits

Detailed and Complete Alternative Models

• SN74AS21N: Similar dual 4-input AND gate from Texas Instruments
• MC74AS21D: Dual 4-input AND gate from ON Semiconductor
• CD54/74AC21: Dual 4-input AND gate from Texas Instruments (Advanced CMOS family)

These alternative models provide similar functionality and can be used as replacements for the DM74AS21MX in various applications.

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