Jump to content
Electronics-Lab.com Community

Newbie question on terminology


Recommended Posts

Thanks very much, everyone.

I have another one (and it looks like I'll have tons more). Not sure if I should post it here though. Probably it's better idea to create a new topic... ???
Anyhow, here it is, where to find basic description of components? I mean function, purpose, basic schemes how to use, etc.
I.e. what is "latch"? How it works? Where, when and what for should I use it? Or what for and when should I use "octal 3-state transmitter/receiver" like 74CT244? What is "3-state" (I suppose 0, 1, Z)?
I'm trying to create some device on DSP, but when I look on schematics, I don't understrand lots of things, so I have to learn it, therefore I need you help.
I have some knowledge, but it's waaay too outdated and basic.

Thank you in advance,
Any info like web-links, book, or just "directions" where to start/look whould be very useful.

Link to post
Share on other sites

Hi kevin,
What is the difference between an open circuit and a 3 state?Suppose I have a memory device with tri state I/o buffers.If I tristate output buffers (which may be having valid voltage levels on their I/O pins corresponding to data from a previous read but not producing current)and enable input buffers for writing,then the data I put on the bus would cause contention resulting garbage written to the selected location.
What is the voltage of a 'Z' state?Does it correspond to logic1/logic0 or any other?Why do they show a horizontal line at the center of the waveform if it can be any open circuit voltage?
Regards
-shekhar

Link to post
Share on other sites

shekhar,
Tri-state refers to a feature of some digital devices which allow a connector (pin) to either act as a normal output, drive a signal onto a line, or to be "tri stated" which is setting it to a high-impedance ("high Z") condition. This allows other outputs to drive signals onto the same line. Often the same connector in a circuit will also function as an input when its output circuitry is tri-stated.

Tri-state outputs are typically used for the connection of several digital circuits to a shared bus where any one of them may output data for the others to input.

MP

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
  • Create New...