74LS90 counter initial value

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abdullah.ali26

Joined Feb 22, 2017
2
I have a project with 4 counters 2 for seconds and 2 for minutes ... i used simple 555 ct. as a clk
used no gates , just counters .. every thing is cool in counting
only problem is first count is 8 x( ..
like
88 88
88 89
88 90
.
.
.
00 00
00 01
then continues perfectly
I tried protus simulator and my design started counting from 0
i hope i get some advice and thanks in advance
 

ericgibbs

Joined Jan 29, 2010
11,903
hi,
You need to apply a power up, HIGH going reset pulse to pins 6,7 & 2,3 of the 74ls90.
E

Edit: corrected pulse sense.!
 
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