Overview
The PCA9517DGKR, produced by Texas Instruments, is a 2-bit level-translating I2C/SMBus buffer/repeater designed to enhance the functionality and reliability of I2C and SMBus systems. This BiCMOS integrated circuit is capable of operating within a wide supply voltage range of 0.9 V to 5.5 V, making it versatile for various mixed-mode applications. The device supports voltage-level translation between low voltages on the B side (down to 0.9 V) and higher voltages (2.7 V to 5.5 V) on the A side, ensuring seamless communication across different voltage domains.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Supply Voltage Range | 0.9 V to 5.5 V | V |
| I2C Bus Frequency | Up to 400 kHz | kHz |
| Bus Capacitance | Up to 400 pF per bus | pF |
| Input/Output Voltage Tolerance | Up to 5.5 V | V |
| Enable Input Type | Active-high with internal pullup to VCCB | |
| Package Type | 8-VSSOP, 8-MSOP | |
| Operating Temperature Range | -40°C to +85°C | °C |
| RoHS Compliance | Yes |
Key Features
- Level translation between low voltages (down to 0.9 V) and higher voltages (2.7 V to 5.5 V) for mixed-mode applications.
- Buffers both serial data (SDA) and serial clock (SCL) signals on the I2C bus.
- Supports I2C bus and SMBus systems.
- Active-high repeater-enable input with internal pullup to VCCB.
- Open-drain I2C I/Os and 5.5-V tolerant inputs.
- Lockup-free operation.
- Ability to connect multiple PCA9517s in series or in a star topology without offset voltage buildup.
- Power-up circuit keeps output drivers turned off until VCCB and VCCA are above specified thresholds.
Applications
- I2C and SMBus system extensions in mixed-voltage environments.
- Isolation of two halves of a bus for voltage and capacitance reasons.
- Use in systems requiring level translation between different voltage domains.
- Implementation in star or series topologies for expanded bus capabilities.
- Integration into safety-critical applications where reliable bus communication is essential.
Q & A
- What is the primary function of the PCA9517DGKR?
The PCA9517DGKR is a level-translating I2C/SMBus buffer/repeater that enables voltage-level translation and signal buffering between different voltage domains.
- What is the operating supply voltage range of the PCA9517DGKR?
The device operates within a supply voltage range of 0.9 V to 5.5 V.
- Can the PCA9517DGKR support clock stretching and arbitration across the repeater?
No, the PCA9517DGKR does not support clock stretching and arbitration across the repeater.
- How does the enable input work on the PCA9517DGKR?
The PCA9517DGKR has an active-high enable input with an internal pullup to VCCB, allowing the user to control when the repeater is active.
- What types of drivers does the PCA9517DGKR have?
The PCA9517DGKR has two types of drivers: A-side drivers and B-side drivers.
- Can multiple PCA9517DGKRs be connected in series or in a star topology?
Yes, multiple PCA9517DGKRs can be connected in series or in a star topology without offset voltage buildup.
- What is the maximum bus capacitance supported by the PCA9517DGKR?
The device supports up to 400 pF of bus capacitance per bus.
- Is the PCA9517DGKR RoHS compliant?
Yes, the PCA9517DGKR is RoHS compliant.
- What is the operating temperature range of the PCA9517DGKR?
The operating temperature range is -40°C to +85°C.
- How does the power-up circuit of the PCA9517DGKR work?
The power-up circuit keeps the output drivers turned off until VCCB is above 2.5 V and VCCA is above 0.8 V.
