Overview
The PCA9546ADGVR, produced by Texas Instruments, is a quad bidirectional translating switch designed for use with I²C and SMBus systems. This component allows for the fan-out of a single upstream I²C/SMBus pair to four downstream pairs or channels, enabling flexible and efficient communication between multiple devices on the same bus. The PCA9546A supports both Standard-Mode (100 kHz) and Fast-Mode (400 kHz) operation, making it versatile for various applications. It also features an active-low reset input and three address pins, allowing up to eight PCA9546A devices to be connected on the same I²C bus, thus resolving potential address conflicts.
Key Specifications
| Specification | Value |
|---|---|
| Operating Power-Supply Voltage Range | 2.3 V to 5.5 V |
| Input Voltage Tolerance | 5.5 V tolerant |
| Clock Frequency Range | 0 to 400 kHz |
| Number of Channels | 4 |
| Address Pins | 3 (allowing up to 8 devices on the I²C bus) |
| Reset Input | Active-low |
| Operating Temperature Range | -40°C to 85°C |
| Package Type | TSSOP (16 pins) |
| Package Size | 5.00 mm x 4.40 mm |
| ESD Protection | 2000-V Human-Body Model, 1000-V Charged-Device Model |
Key Features
- I²C Bus and SMBus Compatible
- Channel Selection Via I²C Bus, in Any Combination
- Power-up With All Switch Channels Deselected
- Low RON Switches
- Allows 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
- Latch-Up Performance Exceeds 100 mA Per JESD 78
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 PCA9546ADGVR used for? The PCA9546ADGVR is used as a quad bidirectional translating switch for I²C and SMBus systems, allowing multiple devices to share the same bus.
- What is the operating voltage range of the PCA9546ADGVR? The operating power-supply voltage range is from 2.3 V to 5.5 V.
- How many channels does the PCA9546ADGVR support? It supports four downstream I²C/SMBus channels.
- What is the maximum clock frequency supported by the PCA9546ADGVR? The maximum clock frequency is 400 kHz.
- Does the PCA9546ADGVR support voltage-level translation? Yes, it allows voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses.
- How many PCA9546A devices can be connected on the same I²C bus? Up to eight devices can be connected using the three address pins.
- What is the purpose of the active-low reset input on the PCA9546ADGVR? The active-low reset input allows the device to recover from a situation where one of the downstream I²C buses is stuck in a low state.
- Is the PCA9546ADGVR tolerant to high input voltages? Yes, all I/O pins are 5.5-V tolerant.
- What is the operating temperature range of the PCA9546ADGVR? The operating temperature range is from -40°C to 85°C.
- Does the PCA9546ADGVR support hot insertion? Yes, it supports hot insertion.
