LITTLE CRACKY

[Abayomi]

I need an experience answer on how to hold the logic level of a digital circuit and change the level at leisure. This due to the fact that I want to control three 7447 (7-segment decoder) switching between each decoder without affecting the previous decoder

[SL4P]

I need an experience answer on how to hold the logic level of a digital circuit and change the level at leisure.

I think you need to elaborate a bit more so we can understand your problem!

[Kilrah]

A latch?

[Chris Mr]

The 'old standard' way would be to use a latch in between the data and 7447, one latch for each 7447 with common data input.

These days the 'old standard' way is old and not very standard at all - you would be more likely to use an LED driver and a micro-processor; but it could be that such things are not available to you?

Where is the data coming from and what makes it change 

[Brumby]

I need an experience answer on how to hold the logic level of a digital circuit and change the level at leisure.

I think you need to elaborate a bit more so we can understand your problem!

+1

OP - your description is very vague.  We can't figure out what you actually want to do ... which means there's no way for us to help you.

More information is needed.

[PA0PBZ]

I *think* he has one BCD output which he wants to send to 3 different displays. I'd suggest a 4543 which is a decoder + latch. That way you can just latch in the data for one of the 3 displays when you feel like it.

http://www.nxp.com/documents/data_sheet/HEF4543B.pdf

[Ian.M]

Probably related: https://www.eevblog.com/forum/projects/synchronous-counter/
It looks like the O.P. may have an XY problem
He definitely needs a better question, e.g: "How can I store and display three decimal digits on three 7 segment displays using 74xx series logic?", and to add some constraints (e.g: fewest chips, or as cheaply as possible, or using easily available parts)  and specify how the decimal digits will be presented to his circuit, and what is to trigger storing each of the current digits.

However, even that may still be too close to the problem and stepping back and giving us a description of the overall purpose of this project would help steer this topic towards usable solutions