IC enable connection and I2C connection

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hi all,

i want ask how right connect enable in ics , digital communication between ics.

take example this:



in first case have mcu connect pin1 , pin2 example, in second enable pin, in third i2c connection.

i want ask 3 examples:

 - how correctly should choose resistors value?
 - it's error connect decoupling cap? (i suppose it's if want have stable en i'll have delay before  en goes down after pin5 pull down)
 - difference between i2c connection , simple connection between 2 pins? see first have resistor connected vcc , second gnd, why difference?

for individual chips' enable lines read datasheet - that's source of correct
information.  if general input hardwired on cmos ic tie gnd or vcc as
appropriate directly.  ancient ttl logic chips things different, ancient,
you shouldn't seeing them around these days.

for i2c bus things pretty standardized, in lack of other information use 4k7 pullups
on sda , scl.


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