SN74AS645N

Product Overview

• Category: Integrated Circuit
• Use: Bus Transceiver
• Characteristics: High-speed, bidirectional data transfer, voltage level translation
• Package: DIP (Dual In-line Package)
• Essence: Transfers data between two buses with different voltage levels
• Packaging/Quantity: Tube packaging, 25 pieces per tube

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: 10ns
• Maximum Operating Frequency: 100MHz

Detailed Pin Configuration

The SN74AS645N has a total of 20 pins, which are divided into two groups:

Group A (Input/Output Pins)

1. A1 - Data I/O A
2. A2 - Data I/O A
3. A3 - Data I/O A
4. A4 - Data I/O A
5. A5 - Data I/O A
6. A6 - Data I/O A
7. A7 - Data I/O A
8. GND - Ground
9. OE - Output Enable
10. DIR - Direction Control

Group B (Input/Output Pins)

1. B1 - Data I/O B
2. B2 - Data I/O B
3. B3 - Data I/O B
4. B4 - Data I/O B
5. B5 - Data I/O B
6. B6 - Data I/O B
7. B7 - Data I/O B
8. VCC - Power Supply
9. NC - No Connection
10. GND - Ground

Functional Features

• Bidirectional data transfer between two buses with different voltage levels
• Voltage level translation from 5V to 3.3V or vice versa
• High-speed operation with low propagation delay
• Output enable and direction control for flexible bus management

Advantages and Disadvantages

Advantages

• Enables seamless communication between buses operating at different voltage levels
• Supports high-speed data transfer
• Provides flexibility in controlling the direction of data flow
• Easy to use and integrate into existing systems

Disadvantages

• Limited to voltage level translation between 5V and 3.3V
• Not suitable for applications requiring voltage translation beyond the specified range
• May require additional components for more complex bus configurations

Working Principles

The SN74AS645N is a bidirectional bus transceiver that facilitates data transfer between two buses operating at different voltage levels. It uses a combination of input/output pins, output enable, and direction control to manage the flow of data. When the direction control pin (DIR) is set to logic high, data flows from Group A to Group B. Conversely, when DIR is set to logic low, data flows from Group B to Group A. The output enable pin (OE) allows the user to enable or disable the outputs of the transceiver.

Detailed Application Field Plans

The SN74AS645N is commonly used in various applications where voltage level translation and bidirectional data transfer are required. Some specific application fields include:

1. Microcontroller interfacing with peripheral devices
2. Communication interfaces between different logic families
3. Industrial automation systems
4. Data acquisition systems
5. Embedded systems and IoT devices

Detailed and Complete Alternative Models

1. SN74LVC245A: Low-voltage CMOS Octal Bus Transceiver
2. SN74HCT245: High-speed CMOS Octal Bus Transceiver
3. SN74LVCH245A: Low-voltage CMOS Octal Bus Transceiver with 3-State Outputs
4. SN74ACT245: Octal Bus Transceiver with 3-State Outputs

These alternative models offer similar functionality to the SN74AS645N and can be used as replacements depending on specific requirements.

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