SN74LVC8T245PWR Detailed explanation of pin function specifications and circuit principle instructions
The " SN74LVC8T245PW R" is a product from Texas Instruments. It is a 3-state octal bus transceiver , often used in applications that require data transfer between different voltage domains or different logic families.
Here is a detailed explanation of its pin functions and packaging, followed by a FAQ section. Please note that I’ll include all 20 pins of the part.
Pin Function Specifications for SN74LVC8T245PWR
Package Type: Package Type: TSSOP (Thin Shrink Small Outline Package) Pin Count: 20 Pinout and Pin Functions: Pin Number Pin Name Function Description 1 A1 Data input, part of the A bus (Low voltage side) 2 A2 Data input, part of the A bus (Low voltage side) 3 A3 Data input, part of the A bus (Low voltage side) 4 A4 Data input, part of the A bus (Low voltage side) 5 A5 Data input, part of the A bus (Low voltage side) 6 A6 Data input, part of the A bus (Low voltage side) 7 A7 Data input, part of the A bus (Low voltage side) 8 A8 Data input, part of the A bus (Low voltage side) 9 GND Ground, common reference point for the device 10 DIR Direction control input. Controls the direction of data flow (A to B or B to A). 11 B1 Data output, part of the B bus (High voltage side) 12 B2 Data output, part of the B bus (High voltage side) 13 B3 Data output, part of the B bus (High voltage side) 14 B4 Data output, part of the B bus (High voltage side) 15 B5 Data output, part of the B bus (High voltage side) 16 B6 Data output, part of the B bus (High voltage side) 17 B7 Data output, part of the B bus (High voltage side) 18 B8 Data output, part of the B bus (High voltage side) 19 VCC Power supply, connects to the positive supply voltage for the device 20 OE Output enable control. When low, the device outputs data; when high, outputs are in high impedance state. Circuit Principle Instruction:The SN74LVC8T245PWR is an octal transceiver that facilitates bidirectional data transfer between two voltage domains. It is designed with separate A and B buses, which are controlled by the DIR (Direction) pin.
When DIR is low, data flows from A to B. When DIR is high, data flows from B to A. The OE (Output Enable) pin controls the high-impedance state of the B-side outputs, allowing for bus sharing with other devices.The A and B buses are separate, allowing each side to operate at different voltage levels, typically with A operating at a lower voltage (e.g., 3.3V) and B at a higher voltage (e.g., 5V). The device is powered by the VCC pin, and ground is connected to the GND pin.
FAQ: 20 Common Questions about the SN74LVC8T245PWR
1. What is the main function of the SN74LVC8T245PWR? The SN74LVC8T245PWR is a 3-state octal bus transceiver used for bidirectional data transfer between different voltage domains. 2. How does the DIR pin work? The DIR pin controls the direction of data flow. When DIR is low, data flows from A to B. When DIR is high, data flows from B to A. 3. What is the function of the OE pin? The OE pin enables or disables the B-side outputs. When OE is low, the B-side outputs are active; when OE is high, the B-side outputs are in a high impedance state. 4. What is the package type of the SN74LVC8T245PWR? The SN74LVC8T245PWR comes in a TSSOP (Thin Shrink Small Outline Package) with 20 pins. 5. How many data pins does the SN74LVC8T245PWR have? The device has 16 data pins, with 8 for the A bus and 8 for the B bus. 6. Can the SN74LVC8T245PWR operate at different voltage levels? Yes, the device supports separate voltage levels for the A and B buses. For example, A can be 3.3V, and B can be 5V. 7. What is the significance of the GND pin? The GND pin serves as the ground reference for the device, providing a common return path for electrical currents. 8. What are the typical use cases for the SN74LVC8T245PWR? It is commonly used in systems where data needs to be transferred between components with different voltage levels or in systems requiring high-speed data transfer. 9. Can the SN74LVC8T245PWR be used for unidirectional data transfer? Yes, although it is designed for bidirectional transfer, it can be used for unidirectional transfer by tying the DIR pin to a fixed state. 10. What is the maximum operating voltage for the SN74LVC8T245PWR? The device typically operates between 2V and 5.5V, with a nominal VCC of 3.3V or 5V. 11. What is the recommended operating temperature range for the SN74LVC8T245PWR? The device operates within a temperature range of -40°C to +85°C. 12. How does the SN74LVC8T245PWR compare to other bus transceivers? It offers low voltage operation, fast switching speeds, and supports separate voltage domains for A and B buses. 13. Is the SN74LVC8T245PWR suitable for high-speed applications? Yes, the device supports fast switching and can handle high-speed data transfer between components. 14. Can the SN74LVC8T245PWR be used for level shifting? Yes, the device is commonly used for level shifting between devices operating at different voltage levels. 15. What is the power consumption of the SN74LVC8T245PWR? The power consumption is low due to its LVC (Low Voltage CMOS) technology, making it suitable for power-sensitive applications. 16. How does the TSSOP package affect the performance? The TSSOP package offers a compact footprint, making the SN74LVC8T245PWR suitable for space-constrained designs while maintaining high performance. 17. What are the input and output voltage levels for the SN74LVC8T245PWR? The input and output voltage levels are compatible with the operating voltage (typically 3.3V or 5V). 18. Can the SN74LVC8T245PWR be used in automotive applications? Yes, the device can be used in automotive applications as it meets the temperature and voltage requirements for such environments. 19. Is the SN74LVC8T245PWR ESD-protected? Yes, the device features electrostatic discharge (ESD) protection to ensure its reliability in harsh environments. 20. Where can I find more information on the SN74LVC8T245PWR? You can find more information in the datasheet provided by Texas Instruments, which includes detailed electrical characteristics and application notes.This response should provide a thorough understanding of the SN74LVC8T245PWR, its pin functions, packaging, and the most common queries related to its usage. Let me know if you need further clarification!