Counter and comparator circuit with hc393 and hc85

[aruwin]

I searched for a full schematic for building a comparator circuit and counter circuit that are connected to each other, using ics hc393 and hc85 but couldnt find any. Can san someone send me a schematic of this circuit?

[M.Kuznetsov]

Hi aruwin,

Please have a look at this schematic:

HC393 ICs give us values from 0000 to 1111 (where QD is the most significant bit).

HC85 ICs has two 4-bit inputs (where A3 and B3 and the most significant bits) and compares them giving three digital outputs:

1. A > B

2. A = B

3. A < B

You might ask why there are 3 more inputs (A > B_I, A = B_I, A < B_I). Those are needed if you are working with 8-bit numbers.

In addition please have a look at this article for more detailed explanation: 

http://www.electronics-tutorials.ws/combination/comb_8.html

Kind Regards,