Overview
The PCA9546AD, produced by Texas Instruments, is a low-voltage, 4-channel I2C and SMBus switch. This device is designed to manage multiple I2C buses, allowing for the connection of up to eight PCA9546A devices on a single I2C bus. It features a bidirectional translating switch that can handle voltage-level translation between different bus voltages, making it versatile for various applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Power-Supply Voltage Range | 2.3 to 5.5 | V |
| Input Voltage Range | -0.5 to 7 | V |
| Output Current | ±25 | mA |
| Operating Free-Air Temperature Range | -40 to 85 | °C |
| Storage Temperature Range | -65 to 150 | °C |
| Clock Frequency | 0 to 400 kHz | |
| Package Type | SO16 (Small Outline, 16 leads) | |
| Package Dimensions | 9.9 mm x 3.9 mm x 1.35 mm |
Key Features
- 1-of-4 bidirectional translating switches
- I2C bus and SMBus compatible
- Active-low reset input
- Three address pins allowing up to eight PCA9546A devices on the I2C bus
- Channel selection via I2C bus in any combination
- Power-up with all switch channels deselected
- Low RON switches
- Voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses
- No glitch on power-up
- Supports hot insertion
- Low standby current
- 5.5 V tolerant inputs
- ESD protection exceeds JESD 22 – 2000-V Human-Body Model and 1000-V Charged-Device Model
Applications
- Servers
- Routers (Telecom Switching Equipment)
- Factory Automation
- Products with I2C slave address conflicts (e.g., multiple, identical temperature sensors)
Q & A
- What is the PCA9546AD used for? The PCA9546AD is used as a 4-channel I2C and SMBus switch to manage multiple I2C buses and enable voltage-level translation between different bus voltages.
- What is the operating voltage range of the PCA9546AD? The operating power-supply voltage range is from 2.3 V to 5.5 V.
- How many PCA9546A devices can be connected on a single I2C bus? Up to eight PCA9546A devices can be connected on a single I2C bus.
- What is the clock frequency range supported by the PCA9546AD? The clock frequency range is from 0 to 400 kHz.
- Does the PCA9546AD support hot insertion? Yes, the PCA9546AD supports hot insertion.
- What are the package dimensions of the PCA9546AD? The package dimensions are 9.9 mm x 3.9 mm x 1.35 mm.
- What types of applications benefit from using the PCA9546AD? Applications such as servers, routers, factory automation, and products with I2C slave address conflicts benefit from using the PCA9546AD.
- Does the PCA9546AD have ESD protection? Yes, the PCA9546AD has ESD protection that exceeds JESD 22 – 2000-V Human-Body Model and 1000-V Charged-Device Model.
- How are the channels selected on the PCA9546AD? Channels are selected via the I2C bus in any combination.
- What happens to the switch channels during power-up? During power-up, all switch channels are deselected.
