Re: Looking for >5V pretty fast logic
- From: John Fields <jfields@xxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 22 Nov 2007 06:09:45 -0600
On Thu, 22 Nov 2007 03:00:56 -0800 (PST), Klaus Kragelund
<klauskvik@xxxxxxxxxxx> wrote:
Hi
I am using a CD4093 with 4 schmitt triggers wired as a free running
oscillator supplied by 10V. The CD4093 is 4000 series CMOS logic, but
it is just too slow for my application (need a 3MHz oscillator/VCO). I
can live with trigger level that has high tolerance and would shift
the frequency since the loop is closed to form a VCO
So been looking at the 74HC and other series, but cannot find anything
that can handle more than 6V and that is fast
Do any of you guys know of a chip? Or perhaps a faster VCO than the
CD4046 PLL. Alternatively building a astable oscillator with 2
MOSFETs. Maybe even a 74HC 5V IC, but with a simple levelshift to get
a fast 10V output
---
Why not use HC to get the speed you need and then a fast-ish
comparator to do the level conversion?
--
JF
.
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