SN74LV245ATDWR

Overview

• Category: Integrated Circuit (IC)
• Use: Level Shifter and Bus Transceiver
• Characteristics: Low-voltage, Octal Bus Transceiver, 3-state Outputs
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Transfers data between different voltage levels in digital systems
• Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 1.65V to 5.5V
• High-Level Input Voltage: 2V to VCC + 0.5V
• Low-Level Input Voltage: -0.5V to 0.8V
• High-Level Output Voltage: 2.4V (min), VCC (max)
• Low-Level Output Voltage: 0.4V (max), 0.1V (max) when disabled
• Maximum Operating Frequency: 100MHz
• Number of Channels: 8
• Input/Output Type: Non-Inverting
• Output Current: ±12mA
• Propagation Delay Time: 6ns (typical)

Pin Configuration

The SN74LV245ATDWR has a total of 20 pins, which are assigned as follows:

1. DIR (Direction Control)
2. OE (Output Enable)
3. A1 (Input/Output)
4. B1 (Input/Output)
5. A2 (Input/Output)
6. B2 (Input/Output)
7. A3 (Input/Output)
8. B3 (Input/Output)
9. A4 (Input/Output)
10. B4 (Input/Output)
11. GND (Ground)
12. B5 (Input/Output)
13. A5 (Input/Output)
14. B6 (Input/Output)
15. A6 (Input/Output)
16. B7 (Input/Output)
17. A7 (Input/Output)
18. B8 (Input/Output)
19. A8 (Input/Output)
20. VCC (Supply Voltage)

Functional Features

• Bidirectional Data Transfer: Allows data to be transferred in both directions between two systems with different voltage levels.
• 3-state Outputs: The outputs can be disabled, effectively disconnecting the bus lines from the rest of the system.
• Non-Inverting: The input and output signals have the same logic polarity.

Advantages and Disadvantages

Advantages: - Wide supply voltage range allows compatibility with various digital systems. - High-speed operation enables efficient data transfer. - 3-state outputs provide flexibility in controlling bus lines.

Disadvantages: - Limited number of channels may not be suitable for applications requiring a higher number of data lines. - Non-inverting nature may not be suitable for certain applications that require inverted logic.

Working Principles

The SN74LV245ATDWR is designed to shift the voltage levels of digital signals between two systems. It acts as a bidirectional buffer, allowing data to flow in both directions. The DIR pin controls the direction of data transfer, while the OE pin enables or disables the outputs.

When the DIR pin is set to a specific logic level, the corresponding data inputs (A1-A8 or B1-B8) are connected to the respective data outputs (B1-B8 or A1-A8). The non-inverting nature ensures that the logic polarity remains the same during the transfer.

The 3-state outputs allow the bus lines to be disconnected from the system when not in use, preventing any interference or contention on the shared lines.

Detailed Application Field Plans

The SN74LV245ATDWR is commonly used in various digital systems where there is a need to interface between different voltage levels. Some of the application fields include:

1. Microcontroller Interfacing: It can be used to connect microcontrollers operating at different voltage levels, enabling communication between them.
2. Level Shifting in Communication Systems: It is suitable for level shifting in serial communication interfaces such as UART, SPI, and I2C.
3. Bus Transceiver in Data Buses: It can be used as a bus transceiver in data buses, allowing data transfer between systems with different voltage levels.

Detailed and Complete Alternative Models

1. SN74LVC245A: Similar to SN74LV245ATDWR but operates at a lower voltage range (1.65V to 3.6V).
2. SN74HCT245: Operates at a higher voltage range (4.5V to 5.5V) and has TTL-compatible inputs.

These alternative models provide similar functionality but may have different voltage ranges or compatibility features.

In conclusion, the SN74LV245ATDWR is an octal bus transceiver IC that facilitates level shifting between different voltage levels in digital systems. Its bid