Overview
The PCA9517DR, produced by Texas Instruments, is a 2-bit level-translating I2C/SMBus buffer/repeater. This device is designed to extend I2C and SMBus systems without degrading 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), making it suitable for mixed-mode applications. The PCA9517DR buffers both the serial data (SDA) and the serial clock (SCL) signals, allowing two buses of up to 400-pF bus capacitance to be connected in an I2C application. It also enables the isolation of two halves of a bus for voltage and capacitance purposes.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Manufacturer | Texas Instruments | |
| Product Name | PCA9517DR | |
| Product Classification | Signal Buffers, Repeaters and Splitters | |
| Lifecycle Status | NRND (Not Recommended for New Designs) | |
| Package | SOIC (8-pin) | |
| Maximum Operating Temperature | 85°C | |
| Minimum Operating Temperature | -40°C | |
| Supply Voltage Range (A-side) | 0.9 V to 5.5 V | |
| Supply Voltage Range (B-side) | 2.7 V to 5.5 V | |
| Bus Capacitance | Up to 400 pF | Per bus |
| ESD Protection | Exceeds JESD 22 – 5500 V Human-Body Model |
Key Features
- I2C and SMBus Compatibility: Supports standard mode and fast mode I2C devices and multiple masters.
- Level Translation: Bidirectional voltage-level translation between low voltages (down to 0.9 V) and higher voltages (2.7 V to 5.5 V).
- Overvoltage Tolerance: All inputs and I/Os are overvoltage tolerant to 5.5 V, even when the device is unpowered.
- Active-High Enable Input: With an internal pullup resistor.
- Open-Drain I2C I/O: Supports open-drain output configuration.
- Lockup-Free Operation: Ensures reliable operation in safety-critical applications.
- Star Topology Support: Allows multiple PCA9517s to be connected in a star topology or in series without offset voltage buildup.[
Applications
- Servers and Routers: Ideal for telecom switching equipment and other server applications.
- Industrial Equipment: Suitable for industrial environments requiring robust I2C bus extension.
- Products with Multiple I2C Slaves and Long PCB Traces: Enhances signal integrity in systems with many I2C slaves or long PCB traces.[
Q & A
- What is the primary function of the PCA9517DR?
The PCA9517DR is a level-translating I2C/SMBus buffer/repeater designed to extend I2C and SMBus systems without degrading performance, even during level shifting.
- What are the supply voltage ranges for the A-side and B-side of the PCA9517DR?
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 is the maximum bus capacitance supported by the PCA9517DR?
The device supports up to 400 pF of bus capacitance per bus.
- Is the PCA9517DR overvoltage tolerant?
Yes, all inputs and I/Os are overvoltage tolerant to 5.5 V, even when the device is unpowered.
- What types of I2C modes does the PCA9517DR support?
The device supports standard mode and fast mode I2C devices and multiple masters.
- Can multiple PCA9517DRs be connected in series or in a star topology?
Yes, multiple PCA9517DRs can be connected in series or in a star topology without offset voltage buildup.[
- What is the ESD protection level of the PCA9517DR?
The device exceeds JESD 22 – 5500 V Human-Body Model for ESD protection.[
- What is the operating temperature range of the PCA9517DR?
The operating temperature range is from -40°C to 85°C.[
- What package type is the PCA9517DR available in?
The PCA9517DR is available in an 8-pin SOIC package.[
- Is the PCA9517DR recommended for new designs?
No, the PCA9517DR is not recommended for new designs (NRND).[
