Overview
The PCA9548APW, produced by Texas Instruments (now part of NXP Semiconductors), is an 8-channel I2C-bus switch with reset functionality. This device is designed to manage multiple I2C devices on a single bus, resolving potential address conflicts and enabling the use of different voltage levels on each channel. The PCA9548APW features bidirectional translating switches that can be controlled via the I2C bus, allowing for flexible and efficient communication between various devices.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Number of Channels | 8 bidirectional translating switches | 8 |
| Bus Compatibility | I2C Bus and SMBus | I2C, SMBus |
| Reset Input | Active-low reset input | Active-low |
| Address Pins | Three hardware address pins | 3 |
| Voltage-Level Translation | Between 1.8-V, 2.5-V, 3.3-V, and 5-V buses | 1.8-V to 5-V |
| Operating Power-Supply Voltage | 2.3 V to 5.5 V | 2.3 V to 5.5 V |
| Input Tolerance | 5-V tolerant inputs | 5 V |
| Clock Frequency | 0 kHz to 400 kHz | 0 kHz to 400 kHz |
| ESD Protection | Exceeds 2000 V HBM, 200 V MM, 1000 V CDM | 2000 V HBM, 200 V MM, 1000 V CDM |
| Thermal Resistance (Junction to Ambient) | Varies by package (e.g., 89.1°C/W for SSOP) | Varies by package |
| Package Options | SSOP, TVSOP, SOIC, TSSOP, VQFN | SSOP, TVSOP, SOIC, TSSOP, VQFN |
Key Features
- 1-of-8 bidirectional translating switches controlled via the I2C bus
- 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
- Operating power-supply voltage range of 2.3 V to 5.5 V
- 5-V tolerant inputs
- 0 kHz to 400 kHz clock frequency
- ESD protection exceeds 2000 V HBM, 200 V MM, 1000 V CDM
- Latch-up performance exceeds 100 mA per JESD 78, Class II
- Power-up with all switch channels deselected
- Active-low reset input for recovery from stuck I2C-bus states
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 PCA9548APW used for?
The PCA9548APW is used to manage multiple I2C devices on a single bus, resolving potential address conflicts and enabling the use of different voltage levels on each channel.
- How many channels does the PCA9548APW have?
The PCA9548APW has 8 bidirectional translating switches.
- What is the operating voltage range of the PCA9548APW?
The operating power-supply voltage range is from 2.3 V to 5.5 V.
- Is the PCA9548APW compatible with SMBus?
Yes, the PCA9548APW is compatible with both I2C Bus and SMBus.
- 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.
- Can the PCA9548APW handle different voltage levels on each channel?
Yes, the PCA9548APW allows voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses.
- What are the package options for the PCA9548APW?
The PCA9548APW is available in SSOP, TVSOP, SOIC, TSSOP, and VQFN packages.
- Does the PCA9548APW support hot insertion?
Yes, the PCA9548APW supports hot insertion.
- What is the clock frequency range of the PCA9548APW?
The clock frequency range is from 0 kHz to 400 kHz.
- What kind of ESD protection does the PCA9548APW have?
The PCA9548APW has ESD protection that exceeds 2000 V HBM, 200 V MM, and 1000 V CDM.
