The PCF8574 is an 8-bit I/O port expander IC that extends the I/O capabilities of a microcontroller via an I2C bus. It increases the digital I/O count to 21 when used with an Arduino UNO board, with pins configurable as either input or output.

Features:

• I/Os: The PCF8574 provides 8 I/O ports, expanding the digital I/O capabilities of the microcontroller it's connected to. These ports can be individually configured as either inputs or outputs, allowing for versatile interfacing with external devices.
• Interrupt: Pin: Featuring an interrupt pin (INT), the PCF8574 can generate interrupts to the microcontroller upon detecting specific events or conditions. This feature enhances real-time responsiveness in applications, enabling prompt action based on external stimuli.
• Supply Voltage (Min): 2.5V: The PCF8574 operates reliably with a minimum supply voltage of 2.5V. This low operating voltage requirement makes it suitable for use in low-power applications or with power sources that provide limited voltage output.
• Supply Voltage (Max): 6V: With a maximum supply voltage tolerance of 6V, the PCF8574 accommodates a wide range of power sources commonly used in electronic circuits. This ensures compatibility with various system configurations and voltage levels.
• Addresses: 8: It supports 8 unique I2C addresses, enabling multiple PCF8574 devices to coexist on the same I2C bus without address conflicts. This feature facilitates the expansion of I/O capabilities by allowing several PCF8574 modules to be interconnected in a system.
• Frequency (Max): 100 kHz: The PCF8574 supports a maximum I2C communication frequency of 100 kHz. This high-frequency capability ensures efficient data transfer between the microcontroller and the PCF8574, enabling fast and reliable communication in diverse applications.
• Operating Temperature Range: -40°C to 85°C: Designed to withstand harsh environmental conditions, the PCF8574 operates reliably within a wide temperature range from -40°C to 85°C. This temperature tolerance makes it suitable for use in industrial, automotive, and commercial applications subjected to varying environmental temperatures.

 Specifications:

• Number of I/Os: 8
• Interrupt: Pin
• Supply Voltage (Min): 2.5V
• Supply Voltage (Max): 6V
• Addresses: 8
• Frequency (Max): 100 kHz
• Operating Temperature Range: -40°C to 85°C

PCF8574 Pinout:

PCF8574 Connections with Arduino:

Package Includes:

• 1 x PCF8574 IC