PCA9547BS,118

PCA9547BS,118 is a 8-channel I2C-bus multiplexer with reset. This octal bidirectional translating multiplexer is 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. The pass gates of the multiplexers are constructed such that the VDD pin can be used to limit the maximum high voltage which will be passed by the PCA9547.

• 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
• ESD protection exceeds 2000V HBM per JESD22-A114 and 1000V CDM per JESD22-C101
• 24 pin HWQFN package and ambient temperature range from -40 to +85°C