Tell me about the output tolerant function.
The output tolerant function is a function to prevent current from output to the power supply when the output is high impedance or when power supply VCC = 0V.
The specification of the allowable output voltage is described in the output voltage of recommended operating conditions. When input/output specification is 0 - VCC, voltage that exceeds VCC cannot be applied because the circuit has a diode (without tolerant function).
The output voltage of LCX is 0 - 5.5V@output = high-impedance (with output tolerant function), so voltage up to 5.5V can be applied to output regardless of the power supply voltage. When the VCC = 3.3V, it can be directly connected to the 5V bus line.
The output voltage of VCX is 0 - 3.6V@output = high-impedance (with input tolerant function), so voltage up to 3.6V can be applied to input regardless of the power supply voltage. When the power supply voltage VCC = 2.5V, it can be directly connected to the 3.6V bus line.
To directly connect to the bus line, however, whether VOH meets the input voltage VIH level of the IC in the subsequent stage must be checked because the output voltage VOH≈ power supply voltage VCC if the CMOS input of the subsequent stage is driven by the CMOS output of the IC in the previous stage.