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NE566 IC beginners question-Control Pin voltage value

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themaccabee

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Hi,

I was going through the datasheet of NE566 IC .
There is a control voltage Vc to control the frequency of oscillation.But in the datasheet it has been specified V+≦Vc≦V+ where V+ is the input voltage..
I couldnt understand the same.
Also it has been mentioned the absolute maximum voltage to the Vc pin is 3Vpp
Can some body help me to understand the same?
Thanks
 

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The Signetics datasheet shows the correct version as "3/4V+ ≤Vc ≤ V+"

If you check the voltage divider used in the applications, you will see that is right. Unfortunately, I can't link to that datasheet right now.

John

Edit: I will try to attach.
 

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Last edited:
When you analyse the internal circuit of the NE566 you will easily notice that there are plenty of circuitry below the input transistor, so the condition that the bias/control voltage has to be between 3/4Vcc and Vcc is correct ..

:wink:
IanP
 
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