Overview
The PCA9548AD,118 is an octal bidirectional translating switch controlled via the I²C-bus, manufactured by NXP USA Inc. This device is designed to fan out the SCL/SDA upstream pair to eight downstream pairs, allowing for the resolution of I²C slave address conflicts and enabling communication between devices with different voltage levels.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 8 | - |
| Interface Type | I²C, SMBus | - |
| Maximum Clock Frequency | 400 kHz | - |
| Operating Power-Supply Voltage Range | 2.3 V to 5.5 V | - |
| Switch-on Resistance (RON) | 4-20 Ω (depending on VCC) | Ω |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model | - |
| Package | 24-SOIC | - |
| Mounting Style | SMD/SMT | - |
Key Features
- 1-of-8 bidirectional translating switches
- I²C bus and SMBus compatible
- Active-low reset input
- Three hardware address pins for use of up to eight PCA9548A devices on the I²C bus
- Channel selection via I²C bus
- Power-up with all switch channels deselected
- 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
- 5-V tolerant inputs
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 PCA9548AD,118 used for?
The PCA9548AD,118 is used to resolve I²C slave address conflicts and to enable communication between devices with different voltage levels. - How many channels does the PCA9548AD,118 have?
The PCA9548AD,118 has eight bidirectional translating switches. - What is the maximum clock frequency of the PCA9548AD,118?
The maximum clock frequency is 400 kHz. - What is the operating power-supply voltage range of the PCA9548AD,118?
The operating power-supply voltage range is from 2.3 V to 5.5 V. - Does the PCA9548AD,118 support hot insertion?
Yes, it supports hot insertion. - What type of ESD protection does the PCA9548AD,118 have?
The PCA9548AD,118 has ESD protection exceeding 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model. - What package type is the PCA9548AD,118 available in?
The PCA9548AD,118 is available in a 24-SOIC package. - Can the PCA9548AD,118 be used with multiple devices on the same I²C bus?
Yes, it can be used with up to eight PCA9548A devices on the same I²C bus using three hardware address pins. - Does the PCA9548AD,118 have a reset feature?
Yes, it has an active-low reset input. - What are some common applications of the PCA9548AD,118?
Common applications include servers, routers, factory automation, and products with I²C slave address conflicts.
