An AND gate
Most control signals in electronics are active-low signals (usually reset lines, chip select lines and so on). This stems from the fact that most logic families can sink more current than they can source, so fanout and noise immunity increase. (The reason for this is ultimately related to the fact that electrons are negatively charged.) It also allows for wired-OR logic if the logic gates are open-collector/open-drain with a pull-up resistor. Examples of this are the I²C bus and Controller Area Network (CAN).
NAND
Probably you are referring to an Exlusive OR gate (XOR). This logic function (also implemented as an electronic circuit) outputs TRUE (or high) when one and only one of its two inputs is TRUE (or high). A regular OR gate outputs TRUE when either or both of its inputs are TRUE.
input output 000 0 001 0 010 0 011 0 100 0 101 0 110 0 111 1 Just to generalize, No high output till all inputs are high.
Hello The difference between an active low and an active high SR flip-flop is that with the active low SR flip-flop, the system is activated when the inputs to system are zeros while with the active high SR flip-flop, the system is activated when the inputs to the system are ones.
Because the data at the D inputs is passed to the Q output terminals as long as the C enable control inputs are high...it is thus said to be transparent. When the enable inputs go low, the data present at that time is latched into the register and retained.
When all inputs are HIGH.
The output of the AND gate is high when both inputs are high because that is the definition of an AND gate. (Ouput is true ONLY WHEN Input A AND Input B are true.)
high level inputs
An AND gate
In high-performance memory systems these decoders can be used to minimize the effects of system decoding. When used with high-speed memories, the delay times of these decoders are usually less than the typical access time of the memory. This means that the effective system delay introduced by the decoder is negligible. The DM74LS138 decodes one-of-eight lines, based upon the conditions at the three binary select inputs and the three enable inputs. Two active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding. A 24-line decoder can be implemented with no external inverters, and a 32-line decoder requires only one inverter.
L. R. Botting has written: 'The response of a high-pressure pneumatic servomechanism to step and sinewave inputs' -- subject(s): Pneumatic control, Servomechanisms
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The gate is called EXNOR gate. its output is high when only one input is high. the Boolean expression for this gate for two inputs A and B is AB+A'B'
Short the inputs together. Logic: A High input, with the inputs shorted together, will be H+H at the input side of the NAND gate, therefore resulting in a low output. A Low input, with both inputs shorted together, is L+L for inputs, resulting in a High output. Also, a NOR gate can be used in exactly the same way.
A NOR gate