74HCT74D

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74HCT74D

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概述

Description

The 74HCT74D is a dual D-type flip-flop integrated circuit commonly used in digital electronics for data storage and synchronization. It features two separate D flip-flops, each with a data input (D), clock input (CLK), set (SET), and reset (RST) pins.
When the clock signal transitions from low to high, the flip-flop captures the value at the D input and outputs it to the Q output. The SET and RESET inputs allow for asynchronous control, enabling the immediate setting or resetting of the output state without waiting for a clock edge.
The 'HCT' in its name signifies that it is a high-speed CMOS device compatible with TTL logic levels, making it suitable for a wide range of applications in digital circuits. The package type 'D' denotes that it is available in a DIP (Dual In-line Package) form, facilitating easy integration onto circuit boards.
Overall, the 74HCT74D is widely used in memory registers, counters, and state machines due to its reliability and versatility in digital designs.

Features

The 74HCT74D is a dual D-type flip-flop with asynchronous set and reset. Key features include:
1. Dual Flip-Flops: Contains two independent D flip-flops, allowing for versatile data storage and manipulation.
2. Asynchronous Inputs: Each flip-flop has asynchronous set (S) and reset (R) inputs, enabling immediate control over the output states regardless of the clock signal.
3. Edge-Triggered: Operates on the rising or falling edge of the clock signal (CK), ensuring synchronized operation in digital circuits.
4. TTL Compatible: Designed for high-speed performance while maintaining compatibility with TTL logic levels.
5. Wide Supply Voltage Range: Typically operates from 4.5V to 5.5V, making it suitable for various applications.
6. Low Power Consumption: Consumes low static and dynamic power, enhancing efficiency in designs.
7. Standard Pin Configuration: Easy integration into standard circuit designs with a familiar 14-pin DIP or SOIC package.
These features make the 74HCT74D ideal for use in registers, counters, and state machines in digital electronics.

Package

The 74HCT74D is typically available in a dual in-line package (DIP) format, specifically in a 14-pin DIP package. It may also come in surface-mount options like SOIC (Small Outline Integrated Circuit) or TSSOP (Thin Shrink Small Outline Package), depending on the manufacturer.

Pinout

The 74HCT74D is a dual D-type flip-flop with asynchronous clear and preset inputs. It features a total of 14 pins. The pin configuration is as follows:
1. Pin 1 (Q1): Output of the first flip-flop.
2. Pin 2 (Q1'): Inverted output of the first flip-flop.
3. Pin 3 (D1): Data input for the first flip-flop.
4. Pin 4 (CLK1): Clock input for the first flip-flop.
5. Pin 5 (CLR1): Asynchronous clear input for the first flip-flop.
6. Pin 6 (PRE1): Asynchronous preset input for the first flip-flop.
7. Pin 7 (GND): Ground connection.
8. Pin 8 (VCC): Supply voltage (typically +5V).
9. Pin 9 (PRE2): Asynchronous preset input for the second flip-flop.
10. Pin 10 (CLR2): Asynchronous clear input for the second flip-flop.
11. Pin 11 (CLK2): Clock input for the second flip-flop.
12. Pin 12 (D2): Data input for the second flip-flop.
13. Pin 13 (Q2): Output of the second flip-flop.
14. Pin 14 (Q2'): Inverted output of the second flip-flop.
This device operates on the HCT logic family, compatible with TTL inputs.

Manufacturer

The 74HCT74D is manufactured by various semiconductor companies, with Texas Instruments (TI) being one of the prominent producers. Texas Instruments is a global technology company based in the United States that designs and manufactures semiconductors and various integrated circuits. They are well-known for their contribution to the electronics industry, providing products for a wide range of applications, including automotive, industrial, and consumer electronics. The 74HCT74D is a dual D-type flip-flop, commonly used in digital circuits for data storage and synchronization. TI focuses on innovation and quality in semiconductor technology, making them a key player in the electronic components market.

Application

The 74HCT74D is a dual D-type flip-flop with preset and clear inputs, widely used in digital circuits for data storage, synchronization, and state retention. Its applications include memory storage elements, frequency dividers, shift registers, data latching, and timing applications in counters and finite state machines in various electronic devices, including computers, communication systems, and embedded systems.

Equivalent

The 74HCT74D is a dual D-type flip-flop with set and reset. Equivalent products include the 74HC74, 74LS74, and 74F74. These variants may differ in logic levels, speed, and power consumption, so check the specific datasheets for compatibility in your application.

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