PCF8574PWG4 datasheet by Texas Instruments

PCF8574PWG4 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCF8574PWG4 can support?
  The PCF8574PWG4 can support I2C bus frequencies up to 400 kHz.
• How many external interrupts can the PCF8574PWG4 generate?
  The PCF8574PWG4 can generate up to 8 external interrupts, one for each input port.
• Can the PCF8574PWG4 be used as a level shifter?
  Yes, the PCF8574PWG4 can be used as a level shifter, allowing communication between devices operating at different voltage levels.
• What is the maximum current that the PCF8574PWG4 can sink or source?
  The PCF8574PWG4 can sink or source up to 25 mA of current per I/O pin.
• Is the PCF8574PWG4 compatible with 5V systems?
  Yes, the PCF8574PWG4 is compatible with 5V systems, but it can also operate at lower voltages, making it suitable for use in 3.3V or 2.5V systems.