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SN74LVC8T245-Q1: Range of Va & Vb at turn-off and How to handle unused I/O pins

Part Number: SN74LVC8T245-Q1

(a) When both Vcca and Vccb is 0V, before turn on SN74LVC8T245PW, are there the recommended voltage and current of A1 and B1? Are the voltage limits at turn-off the same as the range in the datasheet (Absolute Maximum Voltage -0.5 – 6.5V )?

(b) I’d like to ask about how to handle unused I/O pins. I plan that unused input pins are connected to GND without pull-down resistor and that unused connected pins are open. Could you please tell me if there is any problem with this usage?