Encyclopedia Entry: 74AC74B

Product Overview

Category

The 74AC74B belongs to the category of integrated circuits (ICs) and specifically falls under the family of flip-flops.

Use

This IC is primarily used for storing and manipulating digital data in electronic circuits. It serves as a dual D-type positive-edge-triggered flip-flop.

Characteristics

• Dual D-type flip-flop with clear functionality
• Positive-edge-triggered operation
• High-speed performance
• Low power consumption
• Wide operating voltage range
• Compatibility with TTL and CMOS logic families

Package

The 74AC74B is available in various package options, including DIP (Dual In-line Package) and SOIC (Small Outline Integrated Circuit).

Essence

The essence of the 74AC74B lies in its ability to store and synchronize digital signals, making it an essential component in sequential logic circuits.

Packaging/Quantity

The IC is typically packaged in reels or tubes, with quantities ranging from hundreds to thousands per package.

Specifications

• Supply Voltage Range: 2V to 6V
• High-Level Input Voltage: 2V to VCC
• Low-Level Input Voltage: GND to 0.8V
• High-Level Output Voltage: VCC - 0.5V
• Low-Level Output Voltage: 0.5V
• Maximum Operating Frequency: 100 MHz
• Propagation Delay Time: 7 ns

Detailed Pin Configuration

The 74AC74B consists of 14 pins, each serving a specific function:

1. CLR (Clear)
2. D1 (Data Input 1)
3. CLK (Clock Input)
4. D2 (Data Input 2)
5. Q1 (Flip-Flop Output 1)
6. Q1 (Complementary Output 1)
7. GND (Ground)
8. Q2 (Flip-Flop Output 2)
9. Q2 (Complementary Output 2)
10. PRE (Preset)
11. VCC (Supply Voltage)
12. D3 (Data Input 3)
13. CLK (Clock Input)
14. D4 (Data Input 4)

Functional Features

• Dual flip-flop operation for independent data storage
• Positive-edge-triggered clock input for synchronized data transfer
• Clear and preset inputs for control over the stored data
• Complementary outputs for versatile signal manipulation
• Wide operating voltage range allows compatibility with various logic families

Advantages and Disadvantages

Advantages

• High-speed performance enables efficient data processing
• Low power consumption contributes to energy-efficient designs
• Compatibility with TTL and CMOS logic families enhances versatility in circuit integration
• Clear and preset functionality provides flexibility in data manipulation

Disadvantages

• Limited number of flip-flops per IC package
• Propagation delay may affect timing-sensitive applications
• Sensitivity to noise and voltage fluctuations may require additional circuitry for stabilization

Working Principles

The 74AC74B operates based on positive-edge-triggered flip-flop principles. When a rising edge is detected at the clock input (CLK), the data present at the D1-D4 inputs is transferred to the corresponding flip-flop outputs (Q1-Q2). The clear (CLR) and preset (PRE) inputs allow for controlled resetting and setting of the flip-flop states.

Detailed Application Field Plans

The 74AC74B finds extensive use in various digital systems, including but not limited to: - Microprocessors and microcontrollers - Data storage devices - Communication systems - Timing circuits - Control systems

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the 74AC74B include: - 74HC74 - 74LS74 - CD4013 - SN74LS74A

These alternatives may differ in terms of voltage range, speed, power consumption, and package options. It is important to consider specific requirements and compatibility when selecting an alternative model.

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