# pausing d flip flop output

I want to make a digital timer that counts to 99 minutes 59 seconds the problem is that i want to use 4 digit 7 segment display so i have to oscillate the input of the bcd to 7 segment display between the four digits so i have to control the decade counter 74160 so i use mux to choose which counter to work and counter 5 oscillate switches the mux quickly . How to control f/f wheather to output or to keep the output for itself for now till its turn?

• Why don't you use a sim tool like micro-cap (free) and work this out yourself? – Andy aka Dec 18 '19 at 9:18

This is a buffer with an EN`able pin. When the enable pin is asserted, the buffer produces an output like normal. When the enable pin is de-asserted, the buffer puts its outputs in high-impedance (or high-Z) state. This not only means there's no output, it also means the output won't interfere with other gates trying to produce outputs onto the same wires.