PCF8574PW datasheet by Texas Instruments

PCF8574PW Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCF8574PW can support?
  The PCF8574PW can support I2C bus frequencies up to 400 kHz.
• Can the PCF8574PW be used as a level shifter for I2C signals?
  Yes, the PCF8574PW can be used as a level shifter for I2C signals, allowing it to interface with devices operating at different voltage levels.
• How many external interrupts can the PCF8574PW generate?
  The PCF8574PW can generate up to 8 external interrupts, one for each of its I/O pins.
• Can the PCF8574PW be used as a GPIO expander for microcontrollers?
  Yes, the PCF8574PW can be used as a GPIO expander for microcontrollers, providing additional I/O pins for the microcontroller to use.
• What is the maximum current that the PCF8574PW can sink or source on its I/O pins?
  The PCF8574PW can sink or source up to 25 mA of current on its I/O pins.