PCA9542APW,112

Specialized Overview

The PCA9542APW,112 is a 1-of-2 bidirectional translating multiplexer controlled via the I2C-bus. It fans out one upstream SCL/SDA pair to two downstream SCx/SDx pairs. The device supports an operating power supply voltage range of 2.3 V to 5.5 V and operates at clock frequencies from 0 Hz to 400 kHz. It features low standby current and includes two active LOW interrupt inputs (INT0, INT1) and one active LOW interrupt output (INT). The component is housed in a TSSOP14 package with 14 leads.

Specialized Feature Summary

• Bidirectional translating multiplexer allowing voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses
• Integrated interrupt logic with dedicated inputs for each channel and a combined open-drain output
• Hardware selectable addressing supporting up to eight devices on a single I2C bus
• Power-on reset function initializes the state machine with all channels deselected

Specialized Applications

• Systems requiring expansion of I2C bus capacity beyond address limits
• Resolving I2C address conflicts between multiple identical peripheral devices
• Voltage translation interfaces between different logic families or bus domains

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the packaging format. The suffix indicates the packing method, which may differ between bulk tubes and reels. Ensure the package type matches the intended PCB footprint requirements before finalizing procurement orders.

Specialized Selection Notes

Select this component when a system requires routing I2C signals between two distinct downstream buses while managing interrupt events centrally. Consider the TSSOP14 package dimensions and thermal resistance characteristics during layout planning. Verify that the external pull-up resistor values are compatible with the desired bus capacitance and speed requirements.

Specialized Part Context

This part belongs to the PCA9542A family of I2C-bus multiplexers manufactured by NXP Semiconductors. The family provides solutions for expanding I2C bus capabilities and managing signal integrity across different voltage domains. Other variants in the series offer different channel counts or package options.

Specialized Replacement Considerations

PCA9542AD,112 offers the same functionality in an SO14 plastic small outline package.