Overview
The TCA9517DGKR, 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. It supports bidirectional voltage-level translation between low voltages (down to 0.9 V) and higher voltages (2.7 V to 5.5 V) in mixed-mode applications. The TCA9517 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 in an I2C application.
Key Specifications
| Parameter | Specification |
|---|---|
| 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 |
| 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) |
| Package Size (VSSOP) | 3.00 mm × 3.00 mm |
| Package Size (SOIC) | 4.90 mm x 3.91 mm |
| Enable Input | Active-High with internal pull-up to VCCB |
Key Features
- Bidirectional voltage-level translation between low and high voltages.
- Support for mixed-mode signal operation.
- Active-high repeater-enable input with internal pull-up to VCCB.
- Open-drain I2C I/O and 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
- 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 TCA9517DGKR?
The primary function of the TCA9517DGKR is to provide bidirectional voltage-level translation and buffering for I2C and SMBus systems, allowing the extension of these systems without performance degradation.
- What are the operating supply voltage ranges for the A-side and B-side of the TCA9517DGKR?
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 modes does the TCA9517DGKR support?
The TCA9517DGKR supports both Standard Mode and Fast Mode I2C devices.
- What is the maximum bus capacitance supported by the TCA9517DGKR?
The device supports up to 400 pF of bus capacitance per bus.
- Does the TCA9517DGKR have ESD protection?
Yes, it has ESD protection exceeding JESD 22 standards: Human-Body Model (5500 V), Machine Model (200 V), and Charged-Device Model (1000 V).
- What package options are available for the TCA9517DGKR?
The device is available in VSSOP (8) and SOIC (8) packages.
- How does the active-high repeater-enable input work?
The active-high repeater-enable input has an internal pull-up to VCCB, allowing the user to control when the repeater is active.
- What is the significance of high-impedance I2C pins when powered-off?
This feature ensures that the I2C pins do not load the bus when the device is powered off, preventing potential system failures.
- Can the TCA9517DGKR be used in mixed-mode applications?
Yes, the device supports mixed-mode signal operation, allowing it to translate voltage levels between different voltage domains.
- What are some common applications of the TCA9517DGKR?
Common applications include servers, routers, industrial equipment, and products with many I2C slaves or long PCB traces.
