PCA8574PW,112

I/o Expanders Overview

The PCA8574PW,112 is an 8-bit I/O expander for the I2C-bus manufactured by NXP USA Inc. It operates within a supply voltage range of 2.3 V to 5.5 V and supports Fast-mode I2C communication up to 400 kHz. The device features eight quasi-bidirectional ports that default to inputs at power-up, with latched outputs capable of sinking 25 mA per pin. An active LOW open-drain interrupt output signals input state changes. The TSSOP-16 package includes three hardware address pins allowing up to eight devices on one bus. Typical standby current is 4.5 µA, and it functions between -40 °C and +85 °C.

I/o Expanders Feature Summary

• Quasi-bidirectional I/O ports without direction control registers
• Active LOW open-drain interrupt output for event notification
• Three hardware address pins for multi-device bus configurations
• Low standby current consumption suitable for mobile applications

I/o Expanders Applications

• LED signs and displays
• Industrial control systems
• Key pads and instrumentation
• Servers and PLCs

I/o Expanders Procurement Notes

Verify the specific ordering suffix '112' corresponds to the tube packing method in official documentation. Confirm the manufacturer designation matches NXP Semiconductors specifications. Ensure the component meets RoHS compliance requirements for your target market. Validate the package type against the schematic footprint before integration.

I/o Expanders Selection Notes

Select this component when an I2C interface is required for remote GPIO expansion. The PCA8574 series is functionally identical to the PCF8574 but utilizes different fixed slave addresses. Consider the 400 kHz speed limit if higher bandwidth is needed. Verify that the 25 mA sink capability meets the load requirements for connected peripherals like LEDs.

I/o Expanders Part Context

This part belongs to the PCA8574/PCA8574A family of remote 8-bit I/O expanders. The 'PW' suffix indicates the TSSOP16 plastic thin shrink small outline package. The '112' suffix denotes the standard marking tube packing method. The PCA8574 variant uses a distinct slave address map compared to the PCA8574A.

I/o Expanders Replacement Considerations

The datasheet lists the PCF8574T/3 as a drop-in replacement for the PCA8574D. For migration to newer packages, consider the PCA9674 or PCA9670 series which offer increased addressability and Fm+ speeds.