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About SN75HVD1176's VIH voltage

Hello all.

About SN75HVD1176's question.

There is following description in p2 of datasheet.

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(ABSOLUTE MAXIMUM RATINGS)
   - Vcc(Voltage input at any D, DE or RE terminal)   :  –0.5 to 7 (V)

(RECOMMENDED OPERATING CONDITIONS)
   - VIH(D, DE or RE)   :  2 to Vcc (V)
-------------------------------------------------------------------------------------------------------

Our customer would like to supply 5V at D(#4) pin,when it didn't supply power to Vcc.

Is it no problem when is the above condition?
If it's problem,please tell me any advice.

Best regards,