Pull up vs pulldown

[wt]

For logic inputs, we can either use pull up resistors to 5V for pull down to
ground. What are the pros and cons for boths and which is better to use and
why?
Thanks

 

[Klaus (DK)]

Usually pull-ups are used. This is mainly because TTL devices or open
collector outputs are able to handle that kind of inputs. TTL devices
are able to sink more current (to Low) than to source current (to Hi)
As a rule of thumb: use pull up instead of using pull down.
Just my one Euro cent
Cheers
Klaus


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