The recommended operating voltage range for the MC145170D2 is 2.7V to 5.5V, although it can operate down to 2.3V with reduced performance.
To ensure reliable communication, make sure to use a proper clock signal, ensure the microcontroller and MC145170D2 are in the same voltage domain, and use a pull-up resistor on the SCL line.
The MC145170D2 supports clock frequencies up to 400 kHz, but it's recommended to use a clock frequency of 100 kHz or less for reliable operation.
To handle bus contention, use a bus arbiter or a multiplexer to ensure only one device is transmitting at a time, and implement a retry mechanism in case of bus contention.
The internal pull-up resistors on the SCL and SDA lines are used to pull the lines high when they are not being driven by the microcontroller or other devices on the bus.