Afternoon... I am still working on my trigger project. Here's a question...If I power the 555 with 5v, 6mA, the output current isn't shown??? so... if the JK flip flop inputmax high current (J,K ,pre) is around 20uA, shouldn't I be placing a 250k resistor in line between them? Thanks.

 

Not a problem. The logic inputs are really level sensitive. Seeing +5 volts from a 1 ma capable source is the same as +5 from a 100 amp source.

 

Good point! What condition would cause the JK input to exceed 20uA? Perhaps driving something with the "Q" output? Thanks for the help!

 

Not even that - the input structure limits the current. The IC as a whole might draw more current with loads on the output, but not the inputs.

 

Thank you!