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decade BCD-decimal counter, how
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Borber



Joined: 01 Jan 1970
Posts: 1561
Helped: 117
Location: Slovenia
Post07 Nov 2009 11:08   

decade BCD-decimal counter, how
I need to modify an older counter where 74F190 chip died. Is there any chance to make a substitution with 74LVC (maybe 74LVC109) chips that can count up to 200MHz. Needed is only decade UP counting and reset to 0.
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FvM



Joined: 22 Jan 2008
Posts: 5151
Helped: 766
Location: Bochum, Germany
Post07 Nov 2009 14:58   

decade BCD-decimal counter, how
74LVC isn't for 5V node. 74F190 has actually 100 MHz minimum specified counting speed, unfortunately most logic families don't achieve a similar speed, and there are only few decimal counters left among active parts. Seriously I see two options:
- Try to get an a 74F190 from an antique chips broker
- Design a replacement with a sufficient fast CPLD, e.g. a GAL16V8, 5 ns speed grade
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Borber



Joined: 01 Jan 1970
Posts: 1561
Helped: 117
Location: Slovenia
Post07 Nov 2009 16:30   

Re: decade BCD-decimal counter, how
Yes LVC is 3.3V which is not a problem. I considered it because it is 4-4.5 ns speed and seems to me simpler but I am not shure about result. Solution with CPLD will take me too much time to learn how to program it.
At an another problem it was possible to clock 74LVC109 up to 400MHz and...
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