Encyclopedia Entry: 74ABT2245D,118

Product Information Overview

Category: Integrated Circuit (IC)

Use: The 74ABT2245D,118 is a bidirectional octal bus transceiver IC. It is designed to provide bidirectional communication between two buses with different voltage levels.

Characteristics: - High-speed operation - Low power consumption - Wide operating voltage range - Schmitt-trigger inputs for noise immunity - 3-state outputs for bus isolation

Package: The 74ABT2245D,118 is available in a standard 20-pin SSOP (Shrink Small Outline Package) package.

Essence: This IC acts as a bridge between two buses, allowing data transmission in both directions while maintaining compatibility between different voltage levels.

Packaging/Quantity: The 74ABT2245D,118 is typically sold in reels containing 2500 units per reel.

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Maximum Propagation Delay: 6 ns
• Maximum Quiescent Current: 10 µA

Detailed Pin Configuration

The 74ABT2245D,118 has a total of 20 pins. The pin configuration is as follows:

1. OE (Output Enable) 1
2. A1 (Data Bus A) 1
3. B1 (Data Bus B) 1
4. GND (Ground)
5. B2 (Data Bus B) 2
6. A2 (Data Bus A) 2
7. OE (Output Enable) 2
8. DIR (Direction Control)
9. VCC (Supply Voltage)
10. B3 (Data Bus B) 3
11. A3 (Data Bus A) 3
12. OE (Output Enable) 3
13. B4 (Data Bus B) 4
14. A4 (Data Bus A) 4
15. GND (Ground)
16. A5 (Data Bus A) 5
17. B5 (Data Bus B) 5
18. OE (Output Enable) 4
19. DIR (Direction Control)
20. VCC (Supply Voltage)

Functional Features

• Bidirectional data transmission between two buses with different voltage levels.
• Schmitt-trigger inputs provide noise immunity and improve signal integrity.
• 3-state outputs allow for bus isolation when not actively transmitting data.
• Direction control pin determines the direction of data flow.

Advantages and Disadvantages

Advantages: - High-speed operation enables fast data transfer. - Low power consumption helps conserve energy. - Wide operating voltage range allows compatibility with various systems. - Schmitt-trigger inputs enhance noise immunity, ensuring reliable data transmission. - 3-state outputs enable bus isolation, preventing conflicts on shared buses.

Disadvantages: - Limited to bidirectional communication only. - May require additional components for level shifting in certain applications.

Working Principles

The 74ABT2245D,118 operates by receiving data from one bus and transmitting it to another bus bidirectionally. The direction of data flow is controlled by the DIR pin. When enabled, the IC allows data to pass from Bus A to Bus B, and vice versa. The Schmitt-trigger inputs ensure that the received signals are properly interpreted, even in the presence of noise. The 3-state outputs provide bus isolation when the OE pin is disabled, preventing conflicts on shared buses.

Detailed Application Field Plans

The 74ABT2245D,118 is commonly used in various applications that require bidirectional communication between buses with different voltage levels. Some of the typical application fields include:

1. Microcontroller interfacing: The IC facilitates communication between microcontrollers operating at different voltage levels.
2. Industrial automation: It enables data exchange between control systems and peripheral devices.
3. Communication systems: The IC can be used in networking equipment to interface between different bus architectures.
4. Automotive electronics: It allows for communication between different subsystems within a vehicle.

Detailed and Complete Alternative Models

• SN74ABT2245: This is a similar octal bus transceiver IC offered by Texas Instruments.
• MC74ABT2245: Another alternative from ON Semiconductor, providing similar functionality.

These alternative models offer comparable features and can be considered as substitutes for the 74ABT2245D,118 depending on specific requirements.

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