Re: Pic programmer

In article <12081ipq8vjhjcb@xxxxxxxxxxxxxxxxxx>,
Abstract Dissonance <Abstract.Dissonance.hotmail.com> wrote:

Is there any type of schmitt trigger like 3-State buffer that can be used
for this? Or are these buffers schmitt triggered but I just happen to have
one that is "fixing" it(whatever you call it) at 3.8V?

What I mean by Schmitt Triggers is that ones that "rail" the voltage at 5V
or so.

That a family issue, not a Schmitt Trigger one. The HCT family is specifically
designed to facilitate that type of level translation.

As I posted in my other post, you can get away with adding pullup resistors
on other families such as LS and ALS.


I tried some hex inverters
and they upped the voltage from 3.2V to 4.2V so I was thinking I could use
one of them to increase the voltage a little but seems like a waste to do it
unless I have to(I tried to chain two and see if it would up the voltage
past 5V but still gave me 4.2V.

What family was the inverters? 4.2V is sufficient. You can simply use the
inverters to do the job. You just have to make sure that you invert all of
the pins in your configuration of your programming software.

One last thing. Make sure that you use the programming software debugging
mode to test your pin configuration. An inverted pin description, a broken
or missing wire, or a wiring misconfiguration will mess up your whole day.
This is an instance that taking 10 minutes to ensure that you can wiggle
all the programming pins with the correct voltage and polarity is well worth
the effort.

BAJ
.