PCA9547PW,118

PCA9547PW,118 is an 8-channel I2C-bus multiplexer with reset. This is an octal bidirectional translating multiplexer controlled by the I2C-bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Only one SCx/SDx channel can be selected at a time, determined by the contents of the programmable control register. The device powers up with Channel 0 connected, allowing immediate communication between the host and downstream devices on that channel. An active LOW reset input allows the PCA9547 to recover from a situation where one of the downstream I2C-buses is stuck in a LOW state. Pulling the (active low) RESET pin LOW resets the I2C-bus state machine causing all the channels to be deselected, except Channel 0 so that the host can regain control of the bus.

• Supply voltage range from 2.3 to 5.5V
• I2C-bus 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, one channel at a time
• Power-up with all channels deselected except Channel 0 which is connected
• Low Ron multiplexers, no glitch on power-up, supports hot insertion, low standby current
• 5V tolerant inputs and 0Hz to 400kHz clock frequency
• Allows voltage level translation between 1.8V, 2.5V, 3.3V and 5V buses
• 24 pin TSSOP package
• Ambient temperature range from -40 to 85°C