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The PI4MSD5V9542A is a 1-of-2 bidirectional translating multiplexer, controlled via the I²C bus. 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. Two interrupt inputs, INT0 and INT1, one for each of the SCx/SDx downstream pairs, are provided. One interrupt output, INT, which acts as an AND of the two interrupt inputs, is provided. A power-on reset function puts the registers in their default state and initializes the I2C bus 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 which will be passed by the PI4MSD5V9542A. This allows the use of different bus voltages on each SCx/SDx pair, so that1.2V, 1.8 V, 2.5 V, or 3.3 V parts can communicate with 5 V parts without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5 V tolerant.
1-of-2 bidirectional translating multiplexer
I²C-bus interface logic
Operating power supply voltage :1.65 V to 5.5 V
Allows voltage level translation between 1.2V, 1.8V,2.5 V, 3.3 V and 5 V buses
Low standby current
Low Ron switches
Channel selection via I²C bus
Power-up with all multiplexer channels deselected
Capacitance isolation when channel disabled
No glitch on power-up
Supports hot insertion
5 V tolerant inputs
0 Hz to 400 kHz clock frequency
ESD protection exceeds 8000 V HBM per JESD22-A114, and 1000 V CDM per JESD22-C101
Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA