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Need help: Digital Input Circuit

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diepvu1805

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Hi all,
I want to design a Digital input circuit follow as:
Active : 3VDC - 45VDC
Inactive: <2VDC.
About the active, it's too large. I'm confused that.
Pls, help me!
thank for advance
 

This picture should give you an idea....

CMOS_LogLevel.jpg
 

Thank kak111!
I think, I already known what to do.
 

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