PCF8574APWRE4 datasheet by Texas Instruments

PCF8574APWRE4 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCF8574APWRE4 can support?
  The PCF8574APWRE4 can support I2C bus frequencies up to 400 kHz, but it is recommended to operate at 100 kHz or lower for reliable operation.
• Can the PCF8574APWRE4 be used as a level shifter for 5V to 3.3V or vice versa?
  Yes, the PCF8574APWRE4 can be used as a level shifter for 5V to 3.3V or vice versa, but it is not recommended as it is not designed for level shifting and may not provide reliable operation.
• What is the maximum current that can be sourced or sunk by the PCF8574APWRE4?
  The PCF8574APWRE4 can source or sink up to 25 mA of current per pin, but it is recommended to limit the current to 10 mA or less to ensure reliable operation.
• Can the PCF8574APWRE4 be used in a multi-master I2C bus configuration?
  Yes, the PCF8574APWRE4 can be used in a multi-master I2C bus configuration, but it requires careful design and consideration of bus arbitration and collision detection.
• What is the power-on reset behavior of the PCF8574APWRE4?
  The PCF8574APWRE4 has a power-on reset feature that resets the device to its default state when power is applied. The device will also reset if the VCC supply voltage falls below 1.5V.