Overview
The SN74LVC8T245NSR, produced by Texas Instruments, is an 8-bit dual-supply bus transceiver designed for bidirectional voltage level translation. This IC is optimized for operation with VCCA and VCCB set between 1.65V and 5.5V, making it suitable for interfacing between different voltage nodes such as 1.8V, 2.5V, 3.3V, and 5.5V. Its market positioning targets applications requiring reliable and efficient voltage translation, particularly in industrial automation, consumer electronics, and automotive systems. The SN74LVC8T245NSR stands out for its configurable voltage translation, tri-state outputs, and robust design, making it a competitive choice for engineers seeking versatile and high-performance solutions.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Supply Voltage (VCCA, VCCB) | 1.65 to 5.5 | V | |
| Number of Bits | 8 | ||
| Logic Type | Bus Transceiver | Non-Inverting | |
| Output Type | Tri-State | ||
| Operating Temperature | -40 to +85 | °C | |
| Package | NSR (24-pin SOIC) | ||
| Direction Control | DIR Input | ||
| Output Enable | OE Input | ||
| Ioff Support | Yes | Prevents backflow current | |
| Isolation Feature | Yes | Ensures high impedance when VCC is grounded |
Key Features
- Supports bidirectional voltage level translation between 1.8V, 2.5V, 3.3V, and 5.5V nodes.
- Configurable dual-supply rails for flexible voltage interfacing.
- Tri-state outputs for bus isolation and high-impedance control.
- Direction control (DIR) and output enable (OE) inputs for efficient data flow management.
- Ioff circuitry prevents damaging current backflow during power-off.
- Robust design for industrial and automotive applications.
Applications
The SN74LVC8T245NSR is widely used in applications requiring voltage level translation and bidirectional communication. Key application areas include:
- Industrial Automation: Interfaces between control systems and sensors operating at different voltage levels.
- Consumer Electronics: Enables communication between low-voltage microcontrollers and higher-voltage peripherals.
- Automotive Systems: Facilitates data exchange between modules with varying power requirements.
- Embedded Systems: Provides voltage translation in mixed-voltage designs.
Q & A
1. What is the operating voltage range of the SN74LVC8T245NSR?
The operating voltage range for both VCCA and VCCB is 1.65V to 5.5V.
2. How does the direction control (DIR) input work?
The DIR input determines the data flow direction. When DIR is high, data flows from A to B; when low, data flows from B to A.
3. What is the purpose of the output enable (OE) input?
The OE input activates or deactivates the outputs. When OE is low, the outputs are enabled; when high, the outputs are in a high-impedance state.
4. Can the SN74LVC8T245NSR be used in automotive applications?
Yes, it is suitable for automotive systems due to its robust design and voltage translation capabilities.
5. What is the significance of the Ioff feature?
The Ioff feature prevents damaging current backflow when the device is powered off, ensuring safe operation.
6. What package does the SN74LVC8T245NSR come in?
It is available in a 24-pin SOIC (NSR) package.
7. Is the SN74LVC8T245NSR compatible with 3.3V and 5V systems?
Yes, it can interface between 3.3V and 5V systems seamlessly.
8. What is the maximum operating temperature?
The device operates reliably from -40°C to +85°C.
9. Can the SN74LVC8T245NSR be used in partial power-down applications?
Yes, it supports partial power-down applications with its Ioff and isolation features.
10. How does the SN74LVC8T245NSR ensure high impedance during power-up or power-down?
By connecting the OE input to VCC through a pull-up resistor, the device ensures high impedance during these states.
