Description

The PCA9548PW is a octal bi-directional translating switch controlled by the I2C-bus. It has the capability to fan out the SCL/SDA upstream pair to eight downstream pairs or channels. The individual SCx/SDx channel or combination of channels can be selected based on the contents of the programmable Control Register.

Specifications and features

The PCA9548PW offers the following specifications and features:

• 1-of-8 bi-directional translating switches
• I2C interface logic; compatible with SMBus standards
• Active LOW Reset Input
• 3 address pins allowing up to 8 devices on the I2C-bus
• Channel selection via I2C-bus, in any combination
• Power-up with all switch channels deselected
• Low RdsON 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 stand-by 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 per JESD22-A114, 150 V MM per JESD22-A115 and 1000 V per JESD22-C101
• Latchup testing is done to JESDEC Standard JESD78 which exceeds 100 mA
• Packages offered: SO24, TSSOP24

Application Scenarios

The PCA9548PW can be used in various applications such as:

• Electronic component switching and control
• Interfacing between different voltage buses
• Multi-channel I2C/SMBus communication

Comparison

Advantages:

• Provides bi-directional translating switches
• Supports voltage level translation between multiple buses
• Compatible with I2C and SMBus standards
• Low RdsON switches reduce power consumption
• Supports hot insertion without glitches

Disadvantages:

• Latchup testing limited to 100 mA
• Available in limited package options (SO24, TSSOP24)