JAJSGE1A October 2018 – October 2019 ISO1042-Q1
The VCC1 supply for the isolated digital input and output side of the device can be supplied by 1.8-V, 2.5-V, 3.3-V, and 5-V supplies and therefore the digital inputs and outputs are 1.8-V, 2.5-V, 3.3-V, and 5-V compatible.
The TXD pin is very weakly internally pulled up to VCC1. An external pullup resistor should be used to make sure that the TXD pin is biased to recessive (high) level to avoid issues on the bus if the microprocessor does not control the pin and the TXD pin floats. The TXD pullup strength and CAN bit timing require special consideration when the device is used with an open-drain TXD output on the CAN controller of the microprocessor. An adequate external pullup resistor must be used to make sure that the TXD output of the microprocessor maintains adequate bit timing input to the input on the transceiver.