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SN74HC14: Inverter with specific input feature

Part Number: SN74HC14
Other Parts Discussed in Thread: CD40106B, SN74AHC14,

Hi,

Good Day. I have a customer who has a query about logic device. Please see below for his query. Thank you very much.

I am looking for an inverter with a specific input feature...to replace a SN74HC14N..or..CD40106B. My problem is the clamping diodes between the input and Vdd. I need an input that can be "high" while the power is off Vcc.  it back-feeds the Vdd supply through the clamping diodes.

Best Regards,

Ray Vincent