PCA9543A - Texas Instruments

PCA9543A 2-Channel I2C Bus Switch

The PCA9543A is a dual bidirectional translating switch controlled by the I2C bus. The SCL/SDA upstream pair fans out to two downstream pairs, or channels. Either individual SCn/SDn channel or both channels can be selected, determined by the contents of the programmable control register. Two interrupt inputs (INT1–INT0), one for each of the downstream pairs,.

Features

•1 1-of-2 Bidirectional Translating Switches
• I2C Bus and SMBus Compatible
• Two Active-Low Interrupt Inputs
• Active-Low Interrupt Output
• Active-Low Reset Input
• Two Address Pins Allowing up to Four PCA9543A Devices on the I2C Bus
• Channel Selection Via I2C Bus, in Any Combination
• Power-up With All Switch Channels Deselected
• Low RON 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 Standby Current
• Operating Power-Supply Voltage Range of 2.3 V to 5.5 V
• 5.5-V Tolerant Inputs
• 0 to 400-kHz C.