SN74ALS245A-1N

Product Overview

Category

The SN74ALS245A-1N belongs to the category of integrated circuits (ICs) and specifically falls under the family of bus transceivers.

Use

This IC is primarily used for bidirectional data transfer between different voltage systems. It acts as a buffer, allowing seamless communication between devices operating at different voltage levels.

Characteristics

• Bidirectional data transfer
• Compatible with TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor) logic families
• High-speed operation
• Low power consumption
• Wide operating voltage range
• Robust design for reliable performance

Package

The SN74ALS245A-1N is available in a 20-pin DIP (Dual In-line Package) format. This package offers ease of handling and compatibility with standard IC sockets.

Essence

The essence of the SN74ALS245A-1N lies in its ability to facilitate efficient data transfer between devices operating at different voltage levels, ensuring smooth communication within a system.

Packaging/Quantity

The SN74ALS245A-1N is typically packaged in reels or tubes, containing a quantity of 25 or 50 units per package, respectively.

Specifications

• Supply Voltage: 4.5V to 5.5V
• Input Voltage Levels:
  • High-Level Input Voltage: 2.0V to VCC
  • Low-Level Input Voltage: GND to 0.8V
• Output Voltage Levels:
  • 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: 10ns (typical)

Detailed Pin Configuration

The SN74ALS245A-1N has a total of 20 pins, which are assigned specific functions. The pin configuration is as follows:

1. DIR (Direction Control)
2. GND (Ground)
3. B0 (Data Bus Bit 0)
4. B1 (Data Bus Bit 1)
5. B2 (Data Bus Bit 2)
6. B3 (Data Bus Bit 3)
7. B4 (Data Bus Bit 4)
8. B5 (Data Bus Bit 5)
9. B6 (Data Bus Bit 6)
10. B7 (Data Bus Bit 7)
11. VCC (Supply Voltage)
12. OE (Output Enable)
13. A0 (Address Bus Bit 0)
14. A1 (Address Bus Bit 1)
15. A2 (Address Bus Bit 2)
16. A3 (Address Bus Bit 3)
17. A4 (Address Bus Bit 4)
18. A5 (Address Bus Bit 5)
19. A6 (Address Bus Bit 6)
20. A7 (Address Bus Bit 7)

Functional Features

• Bidirectional data transfer between different voltage systems
• Automatic direction control based on the DIR pin input
• Output enable/disable functionality for bus isolation
• TTL and CMOS compatible inputs and outputs
• High-speed operation for efficient data transmission
• Robust design to withstand varying environmental conditions

Advantages and Disadvantages

Advantages

• Enables seamless communication between devices operating at different voltage levels
• Supports bidirectional data transfer, reducing the need for additional components
• Low power consumption for energy-efficient operation
• Wide operating voltage range enhances compatibility with various systems
• Reliable performance due to robust design

Disadvantages

• Limited number of address and data bus lines (8 bits)
• May require additional components for complex data transfer scenarios
• Propagation delay time may impact real-time applications

Working Principles

The SN74ALS245A-1N operates based on the principle of bidirectional data transfer. It uses a DIR pin to control the direction of data flow between two systems. When the DIR pin is set to logic high, data is transferred from the A-side (input) to the B-side (output), and vice versa when the DIR pin is set to logic low.

The IC also incorporates an output enable (OE) pin, which allows the user to disable the outputs, effectively isolating the bus from the rest of the system. This feature is particularly useful when multiple devices share the same bus but need to be individually controlled.

Detailed Application Field Plans

The SN74ALS245A-1N finds application in various fields where bidirectional data transfer between different voltage systems is required. Some specific application areas include:

1. Microcontroller interfacing with external memory or peripherals
2. Communication interfaces between devices operating at different voltage levels
3. Data acquisition systems involving mixed signal processing
4. Industrial automation and control