Whats the voltage on pin24 of the 4067.?
Whats the voltage on pin24 of the 4067
12v
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Whats the voltage on pin24 of the 4067.?
Whats the voltage on pin24 of the 4067
12v
Thanks for the explain. And what kind of pull-down-transistor should I use?
At last... thats why the 4067 is not being addressed.
The MCU 3.3V high, is not seen as a High by the 4067.!
yes i got u, b4 i always control low voltage chips by MCU, It's my first time to control a demux with this voltage level. I can program relatively good but hardware it not really my advantage. Thanks for the turtoring..I'm so lazy I should post the pics. yesterday.
You need to have a voltage higher than about 6V for the address inputs of the 4067 to be 'seen' as high.
A level shifter is required.
Is time travelling faster for me than it is for every other person responding to this thread? Other responders seem to be lagging.
The MCU i/o can output voltage as high as 5.7v, if I follow the datasheet, I need to shift from at least 5v to 10v. is that right? it's for the high level, the low level should shift from 0v to 5v
OK,
Sorry I shouted,
The good news is the 4067's are not dead, are they.?
My pull-up resistor and pull-down transistor is a level shifter and should solve your problem.
hi dknguyen,
Address voltage level inversion.
Dk, I seem to remember you posted a real good appnote for level translation awhile back. Do you remember the link?
I have no idea what you're talking about. But you don't happen to mean this one do you?
https://www.electro-tech-online.com/custompdfs/2009/03/en026368-1.pdf
Yeah I think that might be it. I thought you posted that link before. Anyways thanks.