74HC21D

Product Overview

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

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: 9 ns (typical)
• Quiescent Current: 1 µA (maximum)

Pin Configuration

The 74HC21D has a total of 14 pins. The pin configuration is as follows:

__ __ A1 -| 1 14 |- VCC B1 -| 2 13 |- C1 A2 -| 3 12 |- B2 B2 -| 4 11 |- D2 C2 -| 5 10 |- A3 D1 -| 6 9 |- B3 GND -| 7 8 |- C3 ----------

Functional Features

• Dual 4-input AND gate with independent inputs
• High-speed operation due to CMOS technology
• Low power consumption
• Wide supply voltage range for flexibility in various applications
• Compatible with TTL (Transistor-Transistor Logic) inputs

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient processing of logic signals - Low power consumption reduces energy usage and heat generation - Wide supply voltage range enables compatibility with different systems - Compatibility with TTL inputs allows for seamless integration with existing circuits

Disadvantages: - Limited number of inputs (4 per gate) - Not suitable for applications requiring complex logic operations

Working Principles

The 74HC21D is based on high-speed CMOS technology, which combines the advantages of both CMOS and TTL logic families. It operates by performing logical AND operations on the input signals. The dual 4-input configuration allows for independent processing of two sets of four input signals. The output is determined by the logical AND operation performed on the corresponding input signals.

Detailed Application Field Plans

The 74HC21D can be used in various applications that require logical AND operations. Some potential application fields include:

1. Digital signal processing
2. Data communication systems
3. Microcontroller-based systems
4. Industrial automation
5. Robotics

Detailed and Complete Alternative Models

Some alternative models to the 74HC21D that provide similar functionality are:

1. 74LS21: Dual 4-input AND gate using TTL technology
2. CD4082: Dual 4-input AND gate using CMOS technology
3. SN74HCT21: Dual 4-input AND gate using HCT (High-Speed CMOS) technology

These alternative models offer different characteristics and may be more suitable depending on specific requirements and system compatibility.

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