McLachran Posted December 15, 2004 Report Share Posted December 15, 2004 Hello everyone,I'm a complete newbie in microelectronics, please, don't laugh too much. :)What does "high-impedance state" mean exactly? Quote Link to comment Share on other sites More sharing options...
shekhar_dandya Posted December 15, 2004 Report Share Posted December 15, 2004 Hi MacLachran,I guess a high impedence state is a device with its one terminal or pin floating or not a part of the electrical circuit.SO there is no potential difference between that pin and any other pin in the circuit,not even 0V. Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted December 15, 2004 Report Share Posted December 15, 2004 The high impedance means the voltage applied does not produce a current. Quote Link to comment Share on other sites More sharing options...
McLachran Posted December 16, 2004 Author Report Share Posted December 16, 2004 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understrand lots of things, so I have to learn it, therefore I need you help.I have some knowledge, but it's waaay too outdated and basic.Thank you in advance,Any info like web-links, book, or just "directions" where to start/look whould be very useful. Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted December 16, 2004 Report Share Posted December 16, 2004 A latch is most useful. It is a storage device. Once it is set or reset it will hold the result. Normally a high on the input is used to set or reset and a high on both will, as matter of fact, reset the output. Quote Link to comment Share on other sites More sharing options...
shekhar_dandya Posted December 17, 2004 Report Share Posted December 17, 2004 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 Quote Link to comment Share on other sites More sharing options...
MP Posted December 18, 2004 Report Share Posted December 18, 2004 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 Quote Link to comment Share on other sites More sharing options...
shekhar_dandya Posted December 24, 2004 Report Share Posted December 24, 2004 Hi MP,Merry Christmas :)I just wanted to know what is the voltage level across the High-Z terminals? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.