4-bit binary to decimal into dual 7 segment displays

crutschow said:

A way to reduce the parts count with the counter method is to use a 40110 decade counter driver. This directly drives 7-segment displays and also has a built-in latch to eliminate any flicker while the count is occurring. Of course you also need an up/down binary counter, such as the 4516 or 4029, to go with it.

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ikelectro said:

Yes.. I have thought too about 40110 and you know what in our local market I try to buy 40110 2 months ago but cant find it...in the case about up binary counter i'll use 4510.....
and one more thing if I use 40110 in the circuit that i posted, that will can stop the flickering .. is not it??? what do you say.....???

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ljcox said:

As I said yesterday, flickering won't be a problem if the cycle rate is fast enough.

If the clock freq is 200 kHz then the maximum counting time will be 1.28 ms.

The minimum time will be 0 us (if 0 is to be converted).

So the average time will be 1.28/2 = 640 us.

In Australia, the TV frame frequency is 50 Hz & no flicker is noticable.

EDIT.
The 4553 is a 3 digit BCD up counter. It is available here from JayCar.

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ZUEHB said:

use 74185 IC to display digits on 2 seven segment

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