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The PI4MSD5V9540B is a 1-of-2 bidirectional translating multiplexer, controlled via the I2C/SMBus.
The SCL/SDA upstream pair fans out to two SCx/SDx downstream pairs, or channels. Only one SCx/SDx channel is selected at a time, determined by the contents of the programmable control register. A power-on reset function puts the registers in their default state and initializes the I2C/ SMBus. state machine with no channels selected. The pass gates of the multiplexer are constructed such that the VCC pin can be used to limit the maximum high voltage that is passed by the PI4MSD5V9540B. This allows the use of different bus voltages on each SCx/SDx pair, so that 1.2V, 1.8V, 2.5V or 3.3V parts can communicate with 5V parts without any additional protection. External pull-up resistors can pull the bus up to the desired voltage level for this channel. All I/O pins are 5V tolerant.
1-of-2 bidirectional translating multiplexer
I2C-bus interface logic; compatible with SMBus standards
Operating power supply voltage range of 1.65V to 5.5
Allows voltage level translation between 1.2V, 1.8V, 2.5V, 3.3V and 5V buses
Low standby current
Low Ron switches
Channel selection via I2C-bus
Power-up with all multiplexer channels deselected
No glitch on power-up
Supports hot insertion
5V tolerant inputs
0 Hz to 400 kHz clock frequency
ESD protection exceeds 2000V HBM per JESD22-A114, and 1000 V CDM per JESD22-C101
Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA