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Advantage of Pull Up resistor over Pull down resistor

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sunidrak

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Hi,

What are the advantages of having PULL UP resistor over PULL DOWN resistor interface . As most of the protocols have Pull Up resistor . Like I2C JTAG etc .Is there any specific advantage ?/

Plz answer
 

srizbf

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Hi,

What are the advantages of having PULL UP resistor over PULL DOWN resistor interface . As most of the protocols have Pull Up resistor . Like I2C JTAG etc .Is there any specific advantage ?/

Plz answer

the quiescient state of a pull-up is 1 level.
and that of pull-down , 0.
for connecting many in a single line , the drive does not source any current when it is at 1 level.
if it is at 0 , then there will always be a current drain.
 

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