synchronous counter

[Abayomi]

Am trying to design a circuit that I will use one synchronous decade counter (74192) to control one 7-segment  decoder(7447) . This decoder through a 1-4 demultiplexer  is used to drive three 7-segments displays individually. The problem am now having is how to hold the voltages at each output of the demultiplexer when switching between outputs

[Abayomi]

Any help please

[MosherIV]

There are 2 tecniques:

1 latch the data/pattern into a buffer.

2. Do the multiplexing so fast that the eye sees all 3 displays, relies on persistence of vision.

For more/better help you will have to show a schematic of your circuit.

[David Hess]

Usually the multiplexer drives the 7447 with 4-bit BCD and the 7-segment displays are scanned.  This works fine even with 8 displays and the multiplexer only needs to be 4 bits wide instead of 7 or 8 bits wide.