PCA9539DBR datasheet by Texas Instruments

PCA9539DBR Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9539DBR can support?
  The PCA9539DBR can support I2C bus frequencies up to 400 kHz.
• How do I configure the PCA9539DBR to operate in 8-bit or 16-bit mode?
  The PCA9539DBR can be configured to operate in 8-bit or 16-bit mode by setting the MODE pin high or low, respectively, during power-up.
• What is the maximum current that the PCA9539DBR can sink or source on each output pin?
  The PCA9539DBR can sink or source up to 25 mA of current on each output pin.
• How do I reset the PCA9539DBR?
  The PCA9539DBR can be reset by pulling the RESET pin low for at least 1 ms.
• What is the purpose of the INT pin on the PCA9539DBR?
  The INT pin is an active-low interrupt output that is asserted when a change is detected on any of the input pins.