Overview
The PCA9546APWG4, produced by Texas Instruments, is a 4-channel, bidirectional translating switch designed for I2C and SMBus applications. This device is part of the PCA9546A family and is specifically packaged in a TSSOP (Thin Shrink Small Outline Package) with 16 pins. It is used to expand the number of I2C buses in a system, allowing multiple devices to share the same I2C bus while preventing address conflicts. The PCA9546A supports both Standard-Mode (100 kHz) and Fast-Mode (400 kHz) I2C operations, making it versatile for various applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Power-Supply Voltage Range | 2.3 to 5.5 | V |
| Input Voltage Tolerance | -0.5 to 7 | V |
| Operating Free-Air Temperature Range | -40 to 85 | °C |
| Clock Frequency Range | 0 to 400 | kHz |
| RON (On-State Resistance) | Low RON switches | - |
| ESD Protection | 2000-V Human-Body Model, 1000-V Charged-Device Model | - |
| Package Type | TSSOP (16 pins) | - |
| Body Size (Nominal) | 5.00 mm x 4.40 mm | - |
Key Features
- 1-of-4 bidirectional translating switches for I2C buses
- I2C and SMBus compatible
- Active-low reset input to recover from fault states
- 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
- Voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses
- No glitch on power-up and supports hot insertion
- Low standby current and 5.5 V tolerant inputs
- 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 PCA9546APWG4 used for?
The PCA9546APWG4 is used to expand the number of I2C buses in a system, allowing multiple devices to share the same I2C bus while preventing address conflicts.
- What are the operating voltage ranges for the PCA9546APWG4?
The operating power-supply voltage range is from 2.3 V to 5.5 V.
- Does the PCA9546APWG4 support voltage-level translation?
Yes, it supports voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses.
- What is the maximum clock frequency supported by the PCA9546APWG4?
The maximum clock frequency supported is 400 kHz.
- How many PCA9546A devices can be used on the same I2C bus?
Up to eight PCA9546A devices can be used on the same I2C bus.
- What is the purpose of the active-low reset input?
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 PCA9546APWG4 compatible with SMBus?
Yes, it is compatible with both I2C and SMBus.
- What is the package type and size of the PCA9546APWG4?
The package type is TSSOP with 16 pins, and the body size is 5.00 mm x 4.40 mm.
- Does the PCA9546APWG4 support hot insertion?
Yes, it supports hot insertion.
- What kind of ESD protection does the PCA9546APWG4 have?
The PCA9546APWG4 has ESD protection exceeding 2000-V Human-Body Model and 1000-V Charged-Device Model.
