MC74AC646DWR2G

Product Overview

• Category: Integrated Circuit
• Use: Data Bus Transceiver
• Characteristics: High-Speed, Octal, Non-Inverting, 3-State, Voltage-Level Translator
• Package: SOIC-24
• Essence: This integrated circuit is designed to provide bidirectional voltage-level translation between different logic levels. It can be used to interface between devices operating at different voltage levels.
• Packaging/Quantity: The MC74AC646DWR2G is typically sold in reels of 2500 units.

Specifications

• Logic Family: AC
• Number of Channels: 8
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Voltage Range: 2V to 6V
• Maximum Propagation Delay Time: 10ns
• Maximum Operating Frequency: 100MHz
• Output Drive Capability: ±24mA
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The MC74AC646DWR2G has a total of 24 pins. The pin configuration is as follows:

1. OE (Output Enable) - Active Low Output Enable Input
2. A0-A7 (Data Bus) - Bidirectional Data Bus Inputs/Outputs
3. B0-B7 (Data Bus) - Bidirectional Data Bus Inputs/Outputs
4. DIR (Direction Control) - Direction Control Input
5. GND (Ground) - Ground Reference
6. VCC (Supply Voltage) - Positive Supply Voltage
7. NC (No Connect) - No Connection
8. B7 (Data Bus) - Bidirectional Data Bus Input/Output
9. B6 (Data Bus) - Bidirectional Data Bus Input/Output
10. B5 (Data Bus) - Bidirectional Data Bus Input/Output
11. B4 (Data Bus) - Bidirectional Data Bus Input/Output
12. B3 (Data Bus) - Bidirectional Data Bus Input/Output
13. B2 (Data Bus) - Bidirectional Data Bus Input/Output
14. B1 (Data Bus) - Bidirectional Data Bus Input/Output
15. B0 (Data Bus) - Bidirectional Data Bus Input/Output
16. A7 (Data Bus) - Bidirectional Data Bus Input/Output
17. A6 (Data Bus) - Bidirectional Data Bus Input/Output
18. A5 (Data Bus) - Bidirectional Data Bus Input/Output
19. A4 (Data Bus) - Bidirectional Data Bus Input/Output
20. A3 (Data Bus) - Bidirectional Data Bus Input/Output
21. A2 (Data Bus) - Bidirectional Data Bus Input/Output
22. A1 (Data Bus) - Bidirectional Data Bus Input/Output
23. A0 (Data Bus) - Bidirectional Data Bus Input/Output
24. VCC (Supply Voltage) - Positive Supply Voltage

Functional Features

• Bidirectional voltage-level translation between different logic levels.
• Non-inverting operation preserves the logic state of the input signals.
• 3-state outputs allow multiple devices to share a common bus.
• High-speed operation with a maximum propagation delay time of 10ns.
• Wide operating voltage range from 2V to 6V.

Advantages and Disadvantages

Advantages: - Provides bidirectional voltage-level translation, allowing interfacing between devices operating at different voltage levels. - Non-inverting operation preserves the logic state of the input signals. - 3-state outputs enable multiple devices to share a common bus. - High-speed operation allows for efficient data transfer. - Wide operating voltage range provides flexibility in various applications.

Disadvantages: - Limited to 8 channels, which may not be sufficient for certain complex systems requiring more data lines. - Requires careful consideration of voltage compatibility between input and output devices.

Working Principles

The MC74AC646DWR2G works by utilizing a combination of level-shifting circuitry and non-inverting buffers. When the direction control input (DIR) is set to a specific logic level, the device translates the data from one voltage level to another. The bidirectional nature of the device allows for data transmission in both directions.

The output enable input (OE) controls the tri-state outputs, enabling or disabling the device's connection to the shared bus. When the OE input is active low, the outputs are enabled, allowing the device to drive the bus. Conversely, when the OE input is high, the outputs are disabled, effectively disconnecting the device from the bus.

Detailed Application Field Plans

The MC74AC646DWR2G can be used in various applications that