Overview
The TCA9517DR, 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 performance degradation, even during level shifting. It supports bidirectional voltage-level translation between low voltages (down to 0.9 V) and higher voltages (2.7 V to 5.5 V), making it suitable for mixed-mode applications. The TCA9517DR buffers both the serial data (SDA) and the serial clock (SCL) signals, allowing the connection of two buses with up to 400-pF bus capacitance in an I2C application.
Key Specifications
| Parameter | Description |
|---|---|
| Operating Supply Voltage Range (A-side) | 0.9 V to 5.5 V |
| Operating Supply Voltage Range (B-side) | 2.7 V to 5.5 V |
| I2C Bus Compatibility | Standard Mode and Fast Mode I2C Devices |
| Enable Input | Active-High Repeater-Enable Input with internal pull-up to VCCB |
| I2C I/O | Open-Drain I2C I/O, 5.5-V Tolerant |
| Bus Capacitance | Up to 400 pF per bus |
| ESD Protection | Human-Body Model: 5500 V, Machine Model: 200 V, Charged-Device Model: 1000 V |
| Package Options | VSSOP (8), SOIC (8) |
| Operating Temperature Range | -40°C to 85°C |
Key Features
- Bidirectional voltage-level translation (up-translation/down-translation) between low and high voltages.
- Supports mixed-mode signal operation.
- Active-high repeater-enable input with internal pull-up to VCCB.
- Open-drain I2C I/O with 5.5-V tolerant inputs.
- High-impedance I2C pins when powered off.
- Latch-up performance exceeds 100 mA per JESD 78, Class II.
- ESD protection exceeds JESD 22 standards.
Applications
- Servers and data centers.
- Routers and telecom switching equipment.
- Industrial equipment.
- Products with many I2C slaves and/or long PCB traces.
Q & A
- What is the primary function of the TCA9517DR?
The TCA9517DR is a bidirectional buffer with level-shifting capabilities for I2C and SMBus systems, allowing voltage-level translation between different voltage levels.
- What are the operating supply voltage ranges for the A-side and B-side of the TCA9517DR?
The A-side operates from 0.9 V to 5.5 V, and the B-side operates from 2.7 V to 5.5 V.
- What types of I2C devices does the TCA9517DR support?
The TCA9517DR supports Standard Mode and Fast Mode I2C devices.
- What is the purpose of the active-high repeater-enable input?
The active-high repeater-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.
- What is the maximum bus capacitance supported by the TCA9517DR?
The TCA9517DR supports up to 400 pF of bus capacitance per bus.
- What kind of ESD protection does the TCA9517DR offer?
The TCA9517DR offers ESD protection exceeding JESD 22 standards: Human-Body Model (5500 V), Machine Model (200 V), and Charged-Device Model (1000 V).
- What are the package options available for the TCA9517DR?
The TCA9517DR is available in VSSOP (8) and SOIC (8) packages.
- What is the operating temperature range of the TCA9517DR?
The operating temperature range is -40°C to 85°C.
- Can the TCA9517DR be used in mixed-mode applications?
Yes, the TCA9517DR supports mixed-mode signal operation.
- What happens to the I2C pins when the device is powered off?
The I2C pins are in a high-impedance state when the device is powered off.
