Overview
The TCA9517ADGKR, produced by Texas Instruments, is a bidirectional buffer with level-shifting capabilities designed for I2C and SMBus systems. This device enables the extension of I2C and SMBus systems without degradation of performance, even during level shifting between low voltages (down to 0.9V) and higher voltages (2.7V to 5.5V) in mixed-mode applications. It buffers both the serial data (SDA) and the serial clock (SCL) signals on the I2C bus, allowing two buses of up to 400-pF bus capacitance to be connected. The TCA9517ADGKR is particularly useful in applications requiring voltage-level translation and high reliability, such as servers, routers, industrial equipment, and products with many I2C slaves or long PCB traces.
Key Specifications
| Parameter | Value |
|---|---|
| VCCA (min) | 0.9 V |
| VCCA (max) | 5.5 V |
| VCCB (min) | 2.7 V |
| VCCB (max) | 5.5 V |
| Operating Temperature Range | -40°C to 125°C |
| Maximum Frequency | 0.4 MHz (400 kHz) |
| Bus Capacitance | Up to 400 pF |
| ESD Protection | 5500 V Human-Body Model, 200 V Machine Model, 1000 V Charged-Device Model |
| Package | VSSOP (8-pin) |
Key Features
- Two-channel bidirectional buffer with level-shifting capabilities for I2C and SMBus systems.
- Operating supply voltage range of 0.9V to 5.5V on the A-side and 2.7V to 5.5V on the B-side.
- Supports Standard mode and Fast mode I2C devices, as well as SMBus devices.
- Active-high repeater-enable input with internal pull-up to VCCB.
- Open-drain I2C I/O configuration.
- High contention level threshold (VILC) for connections to slaves with weaker pulldown ability.
- Over-voltage tolerant inputs and I/Os up to 5.5V.
- Clock stretching support.
- Low power consumption for energy-efficient devices.
Applications
- Servers and routers (telecom switching equipment).
- Industrial equipment.
- Products with many I2C slaves and/or long PCB traces.
- High-performance applications requiring reliable voltage-level translation.
Q & A
- Q: What is the primary function of the TCA9517ADGKR?
A: The TCA9517ADGKR is a bidirectional buffer with level-shifting capabilities for I2C and SMBus systems, enabling voltage-level translation between different voltage levels. - Q: What are the operating voltage ranges for the A-side and B-side of the TCA9517ADGKR?
A: The A-side operates from 0.9V to 5.5V, and the B-side operates from 2.7V to 5.5V. - Q: What types of I2C modes does the TCA9517ADGKR support?
A: It supports Standard mode and Fast mode I2C devices, as well as SMBus devices. - Q: What is the maximum bus capacitance supported by the TCA9517ADGKR?
A: Up to 400 pF. - Q: Does the TCA9517ADGKR have ESD protection?
A: Yes, it exceeds JESD 22 standards for Human-Body Model (5500V), Machine Model (200V), and Charged-Device Model (1000V). - Q: What is the purpose of the active-high enable (EN) input?
A: The active-high enable input allows the user to select when the repeater is active and can be used to isolate a badly behaved slave on power-up reset. - Q: Can multiple TCA9517ADGKR devices be connected in series?
A: Yes, multiple devices can be connected in series from A-side to B-side without buildup in offset voltage, but B-side to B-side connections are not allowed. - Q: What is the operating temperature range of the TCA9517ADGKR?
A: The operating temperature range is -40°C to 125°C. - Q: What package types are available for the TCA9517ADGKR?
A: It is available in an 8-pin VSSOP package. - Q: Is the TCA9517ADGKR over-voltage tolerant?
A: Yes, all inputs and I/Os are over-voltage tolerant up to 5.5V, even when the device is unpowered.
