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CD4069UB: need to step up the 3.3 volt logic to more than 8 volt.

Part Number: CD4069UB
Other Parts Discussed in Thread: CD40109B

i needed to step up the 3.3-volt logic to more than 8 volts. we have CD4069UB ic available with us. when i saw datasheet i could see that by using VDD at 10 or 15 volts. the input PWM can be stepped up as well. 

i am confused is it possible nad how it can be done.