The PCA9547PW is a 8-channel I2C-bus Multiplexer with reset. The PCA9547 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 master 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 RESET pin low resets the I2C-bus state machine causing all the channels to be deselected, except channel 0 so that the master 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.
1-of-8 Bidirectional translating multiplexer
I2C-bus Interface logic, compatible with SMBus standards
Active low reset input
3 Address pins allowing up to 8 devices on 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
Allows voltage level translation between 1.8, 2.5, 3.3 and 5V buses
No glitch on power-up
Supports hot insertion
Low standby current
5V Tolerant inputs
0Hz to 400kHz Clock frequency
Latch-up testing is done to JEDEC standard JESD78 that exceeds 100mA
(EN)
