Encyclopedia Entry: 74F74

Product Overview

Category

The 74F74 belongs to the category of integrated circuits (ICs), specifically flip-flop ICs.

Use

The 74F74 is commonly used in digital electronics for storing and manipulating binary data. It serves as a basic building block for various applications, including sequential logic circuits, counters, registers, and memory units.

Characteristics

• The 74F74 is a dual D-type positive-edge-triggered flip-flop.
• It operates on a wide supply voltage range, typically between 4.5V and 5.5V.
• The IC is designed to provide high-speed performance with low power consumption.
• It offers excellent noise immunity and robustness against electrical disturbances.
• The 74F74 is compatible with other TTL (Transistor-Transistor Logic) family devices.

Package

The 74F74 is available in a standard 14-pin dual in-line package (DIP). This package provides easy integration into electronic circuits and facilitates soldering onto printed circuit boards (PCBs).

Essence

The essence of the 74F74 lies in its ability to store and transfer binary information using flip-flop functionality. It enables the creation of complex digital systems by combining multiple flip-flops and other logic gates.

Packaging/Quantity

The 74F74 is commonly sold in reels or tubes containing multiple ICs. The exact quantity may vary depending on the supplier and customer requirements.

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• High-Level Input Voltage: 2.0V (min)
• Low-Level Input Voltage: 0.8V (max)
• High-Level Output Voltage: 2.7V (min)
• Low-Level Output Voltage: 0.5V (max)
• Operating Temperature Range: -40°C to 85°C
• Propagation Delay Time: 8 ns (typical)
• Power Dissipation: 20 mW (max)

Detailed Pin Configuration

The 74F74 has a total of 14 pins, each serving a specific function. The pin configuration is as follows:

1. Clear (CLR) - Active LOW clear input
2. Data (D) - Data input for the flip-flop
3. Clock (CLK) - Positive-edge-triggered clock input
4. Preset (PRE) - Active LOW preset input
5. Output Q1 - First flip-flop output
6. Output Q1' - Complementary output of Q1
7. Ground (GND) - Common ground reference
8. Output Q2 - Second flip-flop output
9. Output Q2' - Complementary output of Q2
10. Set (SET) - Active LOW set input
11. Enable (EN) - Active HIGH enable input
12. VCC - Positive power supply voltage
13. Output Q2 - Second flip-flop output
14. Output Q2' - Complementary output of Q2

Functional Features

• Dual D-type flip-flops allow independent storage and manipulation of two separate data inputs.
• Positive-edge-triggered clock input ensures synchronized operation with other components in the system.
• Clear and preset inputs provide control over the initial state of the flip-flops.
• Complementary outputs (Q' and Q) facilitate versatile logic operations and signal routing.
• Enable input allows for dynamic activation or deactivation of the flip-flops.

Advantages and Disadvantages

Advantages

• High-speed performance enables efficient data processing in digital systems.
• Low power consumption contributes to energy-efficient designs.
• Excellent noise immunity ensures reliable operation in noisy environments.
• Compatibility with TTL family devices allows for easy integration into existing circuits.

Disadvantages

• Limited voltage supply range may restrict certain applications.
• The 74F74 is not suitable for high-frequency or high-precision applications due to its propagation delay time.

Working Principles

The 74F74 operates based on the principles of flip-flop logic. It utilizes positive-edge-triggered clock signals to latch and store data inputs. The stored data can be accessed through the output pins, which provide both the direct and complementary representations of the stored values. The clear, preset, and enable inputs allow for control over the flip-flop states and their interaction with other components in the system.

Detailed Application Field Plans

The 74F74 finds extensive use in various digital systems and electronic devices. Some notable application fields include:

1. Sequential Logic Circuits: The 74F74 serves as a fundamental component in designing sequential logic circuits such as counters, shift registers, and state machines.

2. Memory Units: It can be employed in memory units to store and retrieve binary information, forming the basis of RAM (Random Access Memory) and other memory technologies.

3. Data