The PCF8574TS can handle I2C bus frequencies up to 400 kHz, but it's recommended to use a frequency of 100 kHz or less for reliable operation.
Yes, the PCF8574TS can be used as a level shifter between 3.3V and 5V systems, but you need to ensure that the VCC pin is connected to the higher voltage (5V) and the I2C bus is properly terminated.
The PCF8574TS has internal pull-up resistors on the I2C bus, but they are relatively weak (around 10 kΩ). You may need to add external pull-up resistors to ensure reliable operation, especially in noisy environments.
No, the PCF8574TS is not designed to drive high-current devices like LEDs. The output pins are limited to a maximum current of 20 mA, and you should use external transistors or drivers to handle higher currents.
The PCF8574TS does not have a dedicated reset pin. However, you can reset the device by cycling the power supply (VCC) or by sending a series of clock pulses on the I2C bus without any data.
