Hello
I need to connect 5v signals to the input ports of a Kinetis MK66 microcontroller, the ports are not 5v tolerant.
So far I have used an HEF4050 in SOIC, but when trying the CD4050 version in TSSOP I have problems, I think because the propagation time of this chip is quite high, over 140ns.
I found the 74LVC07, which has a much shorter propagation time, about 2ns, could be a solution. But on the other hand, I have read that the inputs of the MK66 have internally an ESD protective diode that I suppose cuts the signal if the current is limited.
My question is whether it would be enough to put serial resistors to the inputs of the ports to be able to connect 5v signals to the ports of this microcontroller. The alternative is to use a 74LVC07, but if I can do it with resistors much better and cheaper.
Regards