Encyclopedia Entry: 74ACT245TTR

Product Overview

Category

The 74ACT245TTR belongs to the category of integrated circuits (ICs), specifically a type of digital logic level shifter.

Use

This IC is commonly used for voltage level shifting in digital systems. It allows for bidirectional data transfer between devices operating at different voltage levels.

Characteristics

• Voltage Level Shifting: The 74ACT245TTR can shift signals between two voltage domains, ensuring compatibility between devices with different voltage requirements.
• Bidirectional Data Transfer: It supports data transmission in both directions, making it suitable for applications requiring communication between devices.
• High-Speed Operation: This IC operates at high speeds, enabling efficient data transfer in time-critical applications.
• Low Power Consumption: It is designed to consume minimal power, making it suitable for battery-powered devices.
• Robust Design: The 74ACT245TTR is built to withstand noise and interference, ensuring reliable data transmission.

Package and Quantity

The 74ACT245TTR is available in a small outline transistor (SOT) package. It is typically sold in reels or tubes containing multiple units.

Essence

The essence of the 74ACT245TTR lies in its ability to facilitate voltage level shifting, enabling seamless communication between devices operating at different voltage levels.

Specifications

• Supply Voltage Range: 2.0V to 6.0V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Maximum Operating Frequency: 120MHz
• Number of Channels: 8
• Input/Output Logic Compatibility: TTL/CMOS

Detailed Pin Configuration

The 74ACT245TTR features a dual in-line package (DIP) with 20 pins. The pin configuration is as follows:

┌───┬───┐ A1 -|1 └─ 20|- VCC B1 -|2 19|- OE# A2 -|3 18|- B7 B2 -|4 17|- A7 A3 -|5 16|- B6 B3 -|6 15|- A6 A4 -|7 14|- B5 B4 -|8 13|- A5 GND-|9 12|- B5 DIR-|10 11|- A5 └───────┘

Functional Features

• Bidirectional Data Transfer: The 74ACT245TTR allows data to be transmitted bidirectionally between devices operating at different voltage levels.
• Automatic Direction Control: The DIR pin controls the direction of data flow, simplifying the interface between devices.
• Output Enable Function: The OE# pin enables or disables the outputs, providing flexibility in controlling data transmission.

Advantages and Disadvantages

Advantages

• Efficient Voltage Level Shifting: The 74ACT245TTR ensures seamless communication between devices with different voltage requirements.
• High-Speed Operation: It supports high-frequency signals, making it suitable for time-critical applications.
• Robust Design: This IC is designed to withstand noise and interference, ensuring reliable data transmission.
• Low Power Consumption: It consumes minimal power, making it ideal for battery-powered devices.

Disadvantages

• Limited Voltage Range: The 74ACT245TTR operates within a specific voltage range, which may not be suitable for all applications.
• Package Size: The small outline transistor (SOT) package may limit its use in certain space-constrained designs.

Working Principles

The 74ACT245TTR utilizes a combination of transistors and logic gates to shift voltage levels. It employs a bidirectional buffer circuit that allows data to flow in both directions, while the DIR pin controls the direction of data transmission. The OE# pin enables or disables the outputs, providing additional control over data transfer.

Detailed Application Field Plans

The 74ACT245TTR finds applications in various fields, including:

1. Microcontroller Interfacing: It facilitates communication between microcontrollers operating at different voltage levels.
2. Sensor Networks: This IC enables data exchange between sensors and microcontrollers with varying voltage requirements.
3. Industrial Automation: It is used in industrial automation systems to interface between devices operating at different voltage levels.
4. Communication Systems: The 74ACT245TTR ensures compatibility between different components in communication systems, such as UART interfaces.

Detailed and Complete Alternative Models

1. SN74LVC245A: This IC offers similar functionality to the 74ACT245TTR, with a wider voltage range and lower power consumption.
2. CD4508B: It provides bidirectional level shifting capabilities with enhanced noise