PCA8574N,112

I/o Expanders Overview

The PCA8574N,112 is an NXP remote 8-bit I/O expander for the I2C-bus with interrupt output. It provides eight quasi-bidirectional ports operating between 2.3 V and 5.5 V. The device features a 400 kHz I2C interface, three hardware address inputs, and an active LOW open-drain interrupt output. It includes a Power-On Reset (POR) that initializes I/Os as inputs with a weak internal pull-up. The latched outputs support up to 25 mA sink capability per pin and 200 mA total package sink current.

I/o Expanders Feature Summary

• Provides general-purpose remote I/O expansion via the two-wire bidirectional I2C-bus
• Features eight quasi-bidirectional ports that default to inputs at power-up
• Includes an active LOW open-drain interrupt output for state change notification
• Supports eight programmable slave addresses using three hardware address pins

I/o Expanders Applications

• LED signs and displays
• Key pads
• Industrial control systems
• Medical equipment
• PLCs

I/o Expanders Procurement Notes

Verify the specific ordering suffix '112' against official documentation to confirm the TSSOP16 package and bulk tube packing method. Ensure the component matches the standard marking requirements specified in the datasheet. Confirm the temperature range of -40 °C to +85 °C aligns with your application environment before finalizing procurement.

I/o Expanders Selection Notes

Select this component when an 8-bit I/O expander with interrupt functionality is required on an I2C bus. It serves as a drop-in replacement for the PCF8574T/3 series. Consider the PCA8574A variant if a different fixed portion of the slave address is needed to avoid conflicts on the same bus. Verify voltage compatibility within the 2.3 V to 5.5 V range.

I/o Expanders Part Context

The PCA8574 is part of NXP's family of remote I/O expanders designed for I2C communication. It complements other models like the PCA9535 and PCA9539 by offering a cost-effective solution for basic GPIO expansion. The device is widely used in embedded systems where microcontroller pins are limited but additional input/output capabilities are necessary.

I/o Expanders Replacement Considerations

The PCA8574D is a drop-in replacement for PCF8574T/3. The PCA8574AD replaces PCF8574AT/3. For migration to newer packages, consider the PCA9674 or PCA9670 series which offer higher speeds and additional features while maintaining similar functionality.