74HC245

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IC 74HC245 Octal Tri-State Trans

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  • Peça do Fabricante #74HC245

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Especificações

Atributo Valor
Series 74HC
Part Status Active
Mounting Type Through Hole

Visão Geral

Description

The 74HC245 is a high-speed bi-directional transceiver designed for data communication between buses in digital circuits. It operates with a supply voltage of 2V to 6V and features eight data lines (A1–A8 and B1–B8) that facilitate the transfer of data in both directions. The device includes an output enable (OE) pin and direction control (DIR) pin, allowing users to select whether data flows from A to B or vice versa.
The 74HC245 is particularly useful in applications where data needs to be isolated from the main bus, providing buffering to improve signal integrity. Its low propagation delay and high noise immunity make it suitable for high-speed digital applications. The IC is housed in various packages, including DIP and SOIC, making it easy to integrate into different circuit designs. Overall, the 74HC245 is a versatile component essential for efficient data transfer in electronic systems.

Equivalent

The 74HC245 chip is an octal bus transceiver. Equivalent products include the 74HCT245, which is a high-speed version, and the 74LS245, which is a low-power version. Other alternatives are the 74AC245 and 74ACT245 for faster operation with lower power consumption. Additionally, you may consider the SN74HC245 from Texas Instruments. Ensure compatibility with your application's voltage and speed requirements when selecting an equivalent.

Features

The 74HC245 is an octal bus transceiver with 3-state outputs, designed for high-speed data transfer. Key features include:
1. Dual Direction Data Flow: Supports bidirectional data transmission, allowing data to flow from A to B or B to A.
2. 3-State Outputs: Outputs can be enabled or disabled, allowing multiple devices to share the same bus without interference.
3. High-Speed Operation: Typically operates at speeds up to 25 MHz, suitable for fast data processing applications.
4. Wide Voltage Range: Compatible with a power supply range of 2V to 6V, making it versatile for various logic levels.
5. Low Power Consumption: Operates with low power, ideal for battery-operated devices.
6. TTL Compatible: The device is compatible with TTL logic levels, ensuring easy integration into existing systems.
7. Input/Output Isolation: Provides isolation between data buses, protecting against signal degradation.
Overall, the 74HC245 is widely used in applications such as microcontroller interfacing, data buffering, and signal routing.

Pinout

The 74HC245 is an octal bus transceiver with 3-state outputs, commonly used for bidirectional data transmission. It features 20 pins in total.
Pin Count and Functions:
1. A1-A8 (Pins 2-9): Data input/output pins for transmitting data from the A bus.
2. B1-B8 (Pins 12-19): Data input/output pins for transmitting data from the B bus.
3. DIR (Pin 1): Direction control pin; when high, data is transferred from A to B, and when low, from B to A.
4. OE (Pin 10): Output Enable; when low, outputs are enabled, and when high, outputs are in high-impedance state (3-state).
5. Vcc (Pin 20): Power supply pin (typically +2V to +6V).
6. GND (Pin 11): Ground pin.
The device allows for efficient data transfer between buses and is commonly used in applications requiring data buffering and communication between different parts of a circuit.

Manufacturer

The 74HC245 is a high-speed CMOS octal bus transceiver manufactured by several companies, with Texas Instruments (TI) being one of the most prominent producers. Texas Instruments is a multinational technology company that designs and manufactures semiconductors and various integrated circuits. They are known for their wide range of products including analog electronics, embedded processors, and digital signal processing solutions.
TI primarily serves markets such as automotive, industrial, communications, and consumer electronics. Founded in 1930, the company has established itself as a leader in the semiconductor industry, focusing on innovation and high-performance solutions. Other manufacturers of the 74HC245 include Nexperia, ON Semiconductor, and Fairchild Semiconductor, which also specialize in various electronic components and integrated circuits. These companies typically operate in the broader semiconductor sector, providing components needed for various electronic applications across multiple industries.

Application

The 74HC245 is an octal bus transceiver primarily used in digital circuits for data transmission. Its application areas include:
1. Data Buffering: It buffers data between two buses, enhancing signal integrity.
2. Bus Switching: It facilitates bidirectional data flow, allowing communication between different parts of a system.
3. Microprocessor Interfaces: Often used to interface microcontrollers or microprocessors with peripherals, enabling data exchange.
4. Memory Expansion: Helps expand data paths in systems requiring additional memory or I/O devices.
5. Level Shifting: Assists in compatibility between different voltage levels in mixed-voltage systems.
These applications make it essential for efficient data management in digital systems.

Package

The 74HC245 is commonly available in several package types, including DIP (Dual In-line Package), SOIC (Small Outline Integrated Circuit), and TSSOP (Thin Shrink Small Outline Package). These packages allow for different mounting options in electronic circuits, depending on space and design requirements.

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