Thanks for all of the replies, very useful. Also for the recommendations on
the 74LVC1G74 and 1G80. I don't know why I didn't check for a 7474 in this
technology, of course they would have that available. But it looks like the
1G80 will do just exactly what I need in a smaller package, so I think
One thing that is hidden in AC and later CMOS is very tightly controlled
edge-rate to combat ground bounce. The original AC components were so
fast, the ground bounce could be measured in volts and they had to be
quickly redesigned.
For the D-FF function, you might consider using one section
watsondani...@gmail.com said:
Let's say I have a 20MHz TCXO. I want to square up the output signal and
divide by two. Easy, just a buffer or inverter and a flip flop. But looking
at the pinout of the 74LVC1G175 (D flip flop) it doesn't have a Q not
output. So now I need a second inverter to
Hi Dan,
74LVC1G80. See: http://www.ti.com/lit/ds/symlink/sn74lvc1g80.pdf
Might be worth looking at.
Dan
On 6/9/2015 4:24 AM, time-nuts-requ...@febo.com wrote:
Let's say I have a 20MHz TCXO. I want to square up the output signal and
divide by two. Easy, just a buffer or inverter and a flip
Hi
The isolation in the package is likely better than the (practical) layout you
will
do to mate up with them. In fact, the single gate stuff probably does a better
job
of isolation than the multi gate stuff, simply because you can spread it out on
the board.
In the case of dividing by two,
Hi
The question is always “good isolation compared to what?”.
If you are expecting 180 db of isolation on a SOT-23 package at 10’s of MHz,
it’s
not going to happen. It’s also not going to happen with a practical pc board
layout
even without the SOT-23 involved.
If something around 120 db is
I have something of a follow up question. How good is the isolation inside
these devices (74LVC, SOT-23 package) between gates?
Let's say I have a 20MHz TCXO. I want to square up the output signal and
divide by two. Easy, just a buffer or inverter and a flip flop. But looking
at the pinout of the
Thanks for the replies! Very informative.
Dan
Sent from my iPhone
On May 31, 2015, at 6:23 PM, Attila Kinali att...@kinali.ch wrote:
On Sun, 31 May 2015 14:06:26 -0400
Dan Watson watsondani...@gmail.com wrote:
Has anyone used or experimented with the 74LVC series of ICs? I have found
I am curious, how the integrated gates could be compared for those
created on discrete elements ? Let say simple gates like this:
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/trangate.html
Regards,
Vlad
On 2015-05-31 18:23, Attila Kinali wrote:
On Sun, 31 May 2015 14:06:26 -0400
The example circuits given on that webpage will be inferior in every way to
RTL and DTL logic from the 1960's, which itself is inferior to late
60's/early 70's TTL.
A good reference on how to do discrete transistor logic design from the
1960's, is TI's book Transistor Circuit Design. I just poked
Moin,
On Mon, 01 Jun 2015 11:00:31 -0400
Vlad t...@patoka.org wrote:
I am curious, how the integrated gates could be compared for those
created on discrete elements ? Let say simple gates like this:
For the same implementation: Worse. There is much less control
over the exact building of
The gates on that page
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/trangate.html
use bipolar transistors. The 74LVC parts are CMOS. There are various
effects caused by that difference.
And those examples have vastly inferior control over input switching
levels, compared to just
Hi,
Has anyone used or experimented with the 74LVC series of ICs? I have found
them quite useful in projects. Supply voltage of 2-5V, and two inverters or
a single gate or flip flip in a SOT package. They make for much cleaner
layouts than large DIPs.
I'm wondering if they are acceptable
Hi
The 74HC series is an “old and slow” CMOS family. In some cases people use
their low speed to do filtering (they won’t follow a fast glitch …). Other than
that
sort of thing, the AC and LVC should be fine replacements for them. The HC
might pull a little less power with nothing going on. If
On Sun, 31 May 2015 14:06:26 -0400
Dan Watson watsondani...@gmail.com wrote:
Has anyone used or experimented with the 74LVC series of ICs? I have found
them quite useful in projects. Supply voltage of 2-5V, and two inverters or
a single gate or flip flip in a SOT package. They make for much
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