minimum voltage for Microcontroller

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barathwaj555

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I am using Phillips 89V51RD2 microcontroller. what is the minimum voltage which the microcontroller can detect as high level input?
 

I think those nice folks from Phillips have clearly and concisely answer your question in the datasheet.
 

Ya. Refer the datasheet of the controller which you are using............ It is explained in detailed there.
Regards,
Jerin.
 

it is around 3.1-3.2 V. also depends on the supply voltage becoz it is sum fraction of it.. confirm with d datasheet.
 
barathwaj555 said:
I am using Phillips 89V51RD2 microcontroller. what is the minimum voltage which the microcontroller can detect as high level input?
Click to expand...

Don't really know why but I checked the data sheet for you.
89V51RD2 has a min high voltage of 0.2*Vdd + 0.9V. For 5V that would be min high level of 1.9V.
Vdd min is 4.5V therefore the absolute lowest Vin-high is 1.8V if Vdd is 4.5V
A good approach, stay above 2V for high input voltage and you are OK.

@nikhil_jain, just curious where you got your numbers from. Crystal ball?

Cheers, Bob
 

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