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For serial IN/parallel OUT driver ICs, the current that can flow to the output is described in the datasheet as 'can drive a maximum of 25mA', so is this the total permissible current for all pins?
The maximum current of 25mA indicated in the datasheet is the maximum current that can flow to one output pin. The total current value must be within the total output current specification or the range not exceeding the total permissible loss.