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Is the high impedance mode of the data bus lines just controlled by the RD-Signal or also by the CS-Signal? What is the max. current load of data bus signals?
The output buffer is enabled when CS and RD are held low, both RD-Signal and CS-Signal are needed for high impedance control. The datasheet specifies 2mA/-1mA load conditions for data bus electrical specifications (page 5 of datasheet).