PCA8574AD datasheet by NXP Semiconductors

PCA8574AD Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that PCA8574AD can support?
  The PCA8574AD can support I2C bus frequencies up to 400 kHz, but it's recommended to limit it to 100 kHz for reliable operation.
• Can I use PCA8574AD as a level shifter for 5V to 3.3V or vice versa?
  Yes, PCA8574AD can be used as a level shifter for 5V to 3.3V or vice versa, but it's essential to ensure that the input voltage on the device does not exceed the recommended maximum rating.
• How do I handle the power-on reset (POR) and brown-out detection (BOD) in PCA8574AD?
  The PCA8574AD has an internal POR and BOD circuitry that resets the device during power-up or brown-out conditions. No external components are required, but it's recommended to add a capacitor to the reset pin to ensure a clean reset signal.
• What is the maximum current that PCA8574AD can sink or source on its I/O pins?
  The PCA8574AD can sink or source up to 25 mA of current on its I/O pins, but it's recommended to limit the current to 10 mA or less to ensure reliable operation and prevent overheating.
• Can I use PCA8574AD in a hot-swappable application?
  Yes, PCA8574AD can be used in hot-swappable applications, but it's essential to ensure that the device is properly powered down before the hot-swap event to prevent damage or data corruption.