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The PCA9542APW is a two-way bidirectional multiplexer controlled via the I²C bus. The SCL/SDA upstream pair fan 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, 1 and 1, are provided, one for each SCx/SDx downstream pair. It provides one interrupt output (IO1), which serves as the AND of the two interrupt inputs.

The power-on reset function sets the registers to their default state and initialises the I²C bus state machine without selecting any channels.

The multiplexer's pass gate is constructed such that the VDD pin can be used to limit the maximum voltage passed by the PCA9542A. This allows different bus voltages to be used on each SCx/SDx pair, enabling 1.8 V, 2.5 V, or 3.3 V components to communicate with 5 V components 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-rated.

PCA9542APW Features

Two-way bidirectional multiplexer

I²C bus interface logic; compatible with SMBus

2 low-active interrupt inputs (1, 1)

Low-active interrupt output (1)

3 address pins allow up to 8 devices on the I²C bus

Channel selection via the I²C bus

All multiplexer channels are unselected at power-up

Low Ron switch

Allows voltage level conversion between 1.8 V, 2.5 V, 3.3 V, and 5 V buses

No pulse interference at power-up

Supports hot insertion

Low standby current

Operating supply voltage range of 2.3 V to 5.5 V

5 V-rated inputs

Clock frequency from 0 Hz to 400 kHz

ESD protection: exceeds 2000 V HBM per JESD22-A114, exceeds 200 V MM per JESD22-A115, exceeds 1000 V CDM per JESD22-C101

Passed lockout testing per JEDEC standard JESD78, exceeding 100 mA

Available package: TSSOP14

PCA9542APW Parameters

Number of input lines:    2 Input    

Number of output lines:    1 Output    

Package/housing:    TSSOP-14    

Propagation delay time:    0.3 ns at 2.3 V to 5.5 V

Minimum supply voltage:    2.3 V    

Maximum supply voltage:    5.5 V    

Mounting style:    SMD/SMT    

Minimum operating temperature:    -40°C    

Maximum operating temperature:    +85°C

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