Overview
The PCA9548ABSHP, produced by NXP USA Inc., is an 8-channel I2C-bus multiplexer with reset. This device enables a single I2C master to interface with up to eight separate I2C slave devices, making it ideal for resolving I2C slave address conflicts in complex systems. The PCA9548A series supports voltage-level translation between different bus voltages, allowing communication between devices operating at 1.8-V, 2.5-V, 3.3-V, and 5-V levels without additional protection.
Key Specifications
| Parameter | Description |
|---|---|
| Number of Channels | 8 |
| I2C Bus Compatibility | I2C and SMBus compatible |
| Reset Input | Active-low reset input |
| Hardware Address Pins | Three hardware address pins for up to eight devices on the I2C bus |
| Channel Selection | Channel selection via I2C bus |
| Power-Up State | Power-up with all switch channels deselected |
| Switch Type | 1-of-8 bidirectional translating switches |
| Operating Voltage Range | 2.3 V to 5.5 V |
| Input Voltage Tolerance | 5-V tolerant inputs |
| Clock Frequency Range | 0 kHz to 400 kHz |
| ESD Protection | Exceeds JESD 22 – 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
| Package Options | HVQFN24, among others |
| Body Size (HVQFN24) | 4.00 mm × 4.00 mm |
Key Features
- 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
- Low RON switches
- ESD protection exceeds JESD 22 standards
- Latch-up performance exceeds 100 mA per JESD 78, Class II
- All I/O pins are 5-V tolerant
Applications
- Servers
- Routers and telecom switching equipment
- Factory automation
- Products with I2C slave address conflicts (e.g., multiple identical temperature sensors)
Q & A
- What is the PCA9548ABSHP used for? The PCA9548ABSHP is used to allow a single I2C master to interface with up to eight separate I2C slave devices, helping to resolve I2C slave address conflicts.
- What are the key features of the PCA9548ABSHP? Key features include voltage-level translation, no glitch on power-up, support for hot insertion, low standby current, and ESD protection.
- What is the operating voltage range of the PCA9548ABSHP? The operating voltage range is from 2.3 V to 5.5 V.
- Is the PCA9548ABSHP compatible with SMBus? Yes, it is compatible with both I2C and SMBus.
- What is the maximum clock frequency supported by the PCA9548ABSHP? The maximum clock frequency supported is 400 kHz.
- Does the PCA9548ABSHP support hot insertion? Yes, it supports hot insertion.
- What are the package options available for the PCA9548ABSHP? Available packages include HVQFN24, among others.
- How does the PCA9548ABSHP handle power-up? The device power-ups with all switch channels deselected.
- Can the PCA9548ABSHP be reset without powering down? Yes, asserting the RESET input causes the same reset and initialization to occur without powering down the part.
- What kind of ESD protection does the PCA9548ABSHP offer? The device offers ESD protection exceeding JESD 22 standards.
