How many volts are VDD? Is it regulated?
And, when the pin is pulled high, in other applications, what voltage is that?
Just two post up CMOS.What logic series is this?
As I recall it, you don't need a resistor on any logic type except plain 74 and its variants. 74LS, 74HC etc are all OK with direct connection to Vcc.
Part of TTL specification is to accept logic levels from 0V to Vcc. There is nothing wrong or unusual about connecting input to Vcc.What logic series is this?
As I recall it, you don't need a resistor on any logic type except plain 74 and its variants. 74LS, 74HC etc are all OK with direct connection to Vcc.
There are always exceptionsPart of TTL specification is to accept logic levels from 0V to Vcc. There is nothing wrong or unusual about connecting input to Vcc.
http://en.wikipedia.org/wiki/Logic_level
There are always exceptions
For a SN7400, TI suggest a resistor to unused inputs (preferably tied to High) with a min and a max value for it. See section 11 of http://www.ti.com/lit/ds/symlink/sn7400.pdf.
True, but the need of a pull up resistor is still an actual matter of interest. It is not as if it was about a 5.5" floppy disk, isn't it? And the reference I gave has been update not later than May 2017.A 6 year old thread??? Really????
True, but the need of a pull up resistor is still an actual matter of interest. It is not as if it was about a 5.5" floppy disk, isn't it? And the reference I gave has been update not later than May 2017.
I have no doubt that the OP don't care, but I imagine a new reader who peruse through the already asked questions and for whom, an "updated" answer could be of an actual interest. After all, you surely don't claim that each and every such reader should ask anew, again and again, the same question, WITHOUT looking if the said question has already been asked. You are right if we consider only the OP, but I consider it potentially useful to update it, even six years later, since the subject is still quite actual. And the point that I brought was not mentioned, six years ago. So, it is not a redundancy.Actually it isn't . The question has been answered and it is 6 years later.
I have no doubt that the OP don't care, but I imagine a new reader who peruse through the already asked questions and for whom, an "updated" answer could be of an actual interest. After all, you surely don't claim that each and every such reader should ask anew, again and again, the same question, WITHOUT looking if the said question has already been asked. You are right if we consider only the OP, but I consider it potentially useful to update it, even six years later, since the subject is still quite actual. And the point that I brought was not mentioned, six years ago. So, it is not a redundancy.
Actually no again. Give it up already and stop trying to up your post count with information you are going to care about.I have no doubt that the OP don't care, but I imagine a new reader who peruse through the already asked questions and for whom, an "updated" answer could be of an actual interest. After all, you surely don't claim that each and every such reader should ask anew, again and again, the same question, WITHOUT looking if the said question has already been asked. You are right if we consider only the OP, but I consider it potentially useful to update it, even six years later, since the subject is still quite actual. And the point that I brought was not mentioned, six years ago. So, it is not a redundancy.
That is a process of intention. I couldn't care less for my "post count".Actually no again. Give it up already and stop trying to up your post count with information you are going to care about.