what is the output capacitance of each channel for this component? It is not specified in the datasheet, but necessary for this project.
The output channels are all tied together in a wired-OR configuration. The time constant of the pull-up depends on the capacitive load. What is the capacitive load when all 6 output channels are tied together?
Since all output channel are tied together with 1K pullup resistor, the output capacitance (of all channels) cannot be large, so as to make sure the resulting time constant (1Kohm x Cout-all) is reasonably smaller than 1 bit time, i.e. 250ns for 4MHz.