PCA9544APW,112

Specialized Overview

The PCA9544APW,112 is a 1-of-4 bidirectional translating multiplexer controlled via the I2C-bus. It fans out one SCL/SDA upstream pair to four SCx/SDx downstream pairs. The device supports voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses by using the VDD pin to limit passed high voltage. It operates with a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies from 0 Hz to 400 kHz. The component includes four active LOW interrupt inputs and one combined interrupt output. It features power-on reset functionality, low standby current, and ESD protection exceeding 2000 V HBM.

Specialized Feature Summary

• Bidirectional translating multiplexer with I2C-bus interface compatible with SMBus
• Voltage level translation capability between 1.8 V, 2.5 V, 3.3 V, and 5 V buses
• Four active LOW interrupt inputs with a combined active LOW interrupt output
• Power-on reset initializes registers and deselects all channels

Specialized Applications

• Expanding I2C-bus capacity by connecting multiple slave devices
• Interfacing components operating at different bus voltages (e.g., 5 V masters with 3.3 V slaves)
• Systems requiring hot insertion support for I2C peripherals
• Applications needing interrupt handling across multiple I2C channels

Specialized Procurement Notes

Verify the ordering suffix '112' corresponds to the TSSOP20 package in tube packing. Confirm the temperature range is -40 °C to +85 °C. Ensure the part number matches the specific package variant required for the design. Cross-reference with NXP official documentation to validate availability and specifications before procurement.

Specialized Selection Notes

Select this component when voltage translation between disparate I2C bus levels is required. The TSSOP20 package suits designs needing a thin shrink small outline form factor. Consider the 400 kHz fast-mode speed and interrupt logic if system latency or multi-channel monitoring is critical. Verify that the 5 V tolerant inputs meet the master controller's output requirements.

Specialized Part Context

The PCA9544A is part of NXP's I2C/SMBus multiplexer family. The APW suffix denotes the TSSOP20 plastic thin shrink small outline package. The ',112' suffix indicates standard marking ICs in tube bulk pack format. This specific variant provides four channels with interrupt logic, distinguishing it from simpler switch variants in the same series.

Specialized Replacement Considerations

PCA9544ABS,118 (HVQFN20 package) offers the same electrical characteristics in a leadless thermal enhanced quad flat package. PCA9544AD,112 (SO20 package) provides an alternative plastic small outline package version. Both are direct functional replacements within the same product family.