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    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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    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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    Re: Digital signals (supplies) : 1 for high voltage & 0 for low voltage OR 1 for high



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    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 ? ?????



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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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    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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    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

    Alex
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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 > 2V
    Last edited by kak111; 5th March 2012 at 23:47.
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