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2nd March 2012, 11:33 #1
Digital signals (supplies) : 1 for high voltage & 0 for low voltage OR 1 for high log
Digital signals (supplies) : 1 for high voltage & 0 for low voltage OR 1 for high logic/state & 0 for low logic/state ?
What is right ?

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2nd March 2012, 18:19 #2
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Re: Digital signals (supplies) : 1 for high voltage & 0 for low voltage OR 1 for high
1s and 0s are logic states "true and not true", they can be defined by any voltage you like, though it is common to define a 1 as > .5 Vcc and a 0 as < .5 Vcc.
Frank
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3rd March 2012, 00:12 #3
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Re: Digital signals (supplies) : 1 for high voltage & 0 for low voltage OR 1 for high
Details here
http://en.wikipedia.org/wiki/Logic_level
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3rd March 2012, 19:31 #4
Re: Digital signals (supplies) : 1 for high voltage & 0 for low voltage OR 1 for high
then ......... what should be right ?
1 for high voltage & 0 for low voltage OR 1 for high logic/state & 0 for low logic/state ? ?????

3rd March 2012, 22:33 #5
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Re: Digital signals (supplies) : 1 for high voltage & 0 for low voltage OR 1 for high
1s and 0s are logic states "true and not true", they can be defined by any voltage you like. I have worked on a logic unit where a "1" was 50V and a "0" was earth (0V). For families of logic TTL,CMOS etc. it is customary to use the true (1) is ~ Vcc and false (0) is ~0V.
Frank
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5th March 2012, 21:12 #6
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Re: Digital signals (supplies) : 1 for high voltage & 0 for low voltage OR 1 for high
no reply from KAK yet

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5th March 2012, 21:29 #7
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Re: Digital signals (supplies) : 1 for high voltage & 0 for low voltage OR 1 for high
1 and 0 represent logic states and are binary values.
Depending on the logic family used they can represent a range of voltages that results in a digital result of 1 or 0
There is a graph http://www.interfacebus.com/voltage_threshold.html
showing the threshold levels for a few logic families
You can also read tutorials like the following
http://www.allaboutcircuits.com/vol_4/chpt_3/10.html
AlexPlease don't make requests for help in private using PM. Create a thread in the forum so that other members can benefit from the posted answers.
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5th March 2012, 23:41 #8
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Re: Digital signals (supplies) : 1 for high voltage & 0 for low voltage OR 1 for high
As alexan_e wrote...
1 and 0 are bit values ( binary digit values) and they represent logic states "true" and "not true".
Boolean algebra deals with the values 0 and 1.
These can be thought of as two integers,
or as the truth values false and true respectively.
In either case they are called bits or binary digits.
A bit is the minimum amount of information that we can imagine,
since it only stores either value 1 or 0, which represents either YES or NO,
activated or deactivated, true or false, etc...
that is: two possible states each one opposite to the other, without possibility of any shades.
So, if you say...
1 for high voltage & 0 for low voltage
It is right.
and this means that , when converting a bit value to a voltage value OR a voltage value to a bit value
bit value = 1 represent voltage value "high voltage"
bit value = 0 represent voltage value "low voltage"
Example: If "low voltage" < 100Volts < "high voltage"
then bit 0 represent all voltage values < 100V and bit 1 represent all voltage values > 100V
ie. NOT TRUE = voltage < 100V and TRUE = voltage > 100V
and, if you say...
1 for high logic/state & 0 for low logic/state
It is right.
and this means that , when converting a bit value to a logic/state OR a logic/state to a bit value
bit value = 1 represent " high logic/state"
bit value = 0 represent "low logic/state"
Example: If "low logic/state" < 2V < "high logic/state"
then bit 0 represent "all logic/states" < 2V and bit 1 represent "all logic/states" > 2V
ie. NOT TRUE = voltage < 2V and TRUE = voltage > 2VLast edited by kak111; 5th March 2012 at 23:47.
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