Jim Thompson wrote:
On Fri, 19 Oct 2012 08:09:38 -0400, "Tom Del Rosso"
wrote:

Jim Thompson wrote:

Taking note that I'm not a logic designer, I'm not sure your
version covers all states.

It passed your sim with slightly different frequencies at each
input to create a walking phase shift.

You did need to match the gates. If they were simmed as discrete
7400's then you had to take the 4 on the left from one package.


It took Ron Treadway NINE gates back in the
mid-60's in the MC4044...

http://www.analog-innovations.com/SED/MC4044_MC4344.pdf

I know. That's why I was surprised it worked with 8 as quoted:

==========quote==========
Newsgroups:
alt.binaries.schematics.electronic,sci.electronics .cad,sci.electronics.design,sci.electronics.misc
Sent: Monday, August 27, 2001 10:26 PM
Subject: Help an Analog Guy with a Digital Problem

The internal feedback disabled the pulse too soon. The resulting
pulse width at the final latch was about 1/2 of what it is with
feedback from the output (~2.5nS vs 5nS).

Ok. So was your testing of the last circuit sucessful under full
load?


You bet...you're now in a product...E-Mail for details.
=========================

Thanks, Tom! I'll have to try that. Does it have deadband?

That exchange was you, me, you. You tested it and according to the email it
went into an RFID Tag Chip that reports temperature and pressure of its
environment via a 2.4GHz RF Link.

Deadband like a frequency where it doesn't work? Wouldn't there just be an
upper limit that depends on the logic speed? I can't teach you anything
about that. You'll have to teach me.

Here is the diagram with markings to show the sequence of transitions. The
=0 and =1 indicate constant states. The "x" after a number means no
further changes are caused by that transition. If you build it with NOR's
it is negative-edge triggered.


below: Q(initially) = 0 RESET = 0


/0
SET -----+------------------------|
| |NAND--+ \1
+-------| \5 +--| | /6x
|NAND--+-----+ |
+--| | |
| | |
+----------|--+ |
| | |
+----------+ | |
| | |
+--| /4 | |
|NAND-----+ |
\3 +-------| +--| Q
| |NAND--+------- /2
+--------------------------------+--| |
| |
+----------|--+
| |
+----------+ |
| | _
+--------------------------------+--| | Q
| |NAND-----+---- \3
/2 +-------| +--|
|NAND--+ \3x |
+--| | |
| | |
+----------|--+ |
| | |
+----------+ | |
| | |
+--| =1 | |
|NAND-----+--+ |
+-------| +--| |
=0 | |NAND--+ =1
RESET -----+------------------------|


below: Q(initially) = 0 RESET = 1


/0
SET -----+------------------------|
| |NAND--+ \1
+-------| \5 +--| | /6x
|NAND--+-----+ |
+--| | |
| | |
+----------|--+ |
| | |
+----------+ | |
| | |
+--| /4 | |
|NAND-----+ |
\3 +-------| +--| Q
| |NAND--+------- /2
+--------------------------------+--| |
| |
+----------|--+
| |
+----------+ |
| | _
+--------------------------------+--| | Q
| |NAND-----+---- \3
/2 +-------| +--|
|NAND--+ =1 |
+--| | |
| | |
+----------|--+ |
| | |
+----------+ | |
| | |
+--| =0 | |
|NAND-----+--+ |
+-------| +--| |
=1 | |NAND--+ =1
RESET -----+------------------------|


below: Q(initially) = 1 RESET = 0


/0
SET -----+------------------------|
| |NAND--+ \1
+-------| \1 +--| | /2x
|NAND--+-----+ |
+--| | |
| | |
+----------|--+ |
| | |
+----------+ | |
| | |
+--| =1 | |
|NAND-----+ |
=0 +-------| +--| Q
| |NAND--+------- =1
+--------------------------------+--| |
| |
+----------|--+
| |
+----------+ |
| | _
+--------------------------------+--| | Q
| |NAND-----+---- =0
=1 +-------| +--|
|NAND--+ =0 |
+--| | |
| | |
+----------|--+ |
| | |
+----------+ | |
| | |
+--| =1 | |
|NAND-----+--+ |
+-------| +--| |
=0 | |NAND--+ =1
RESET -----+------------------------|


below: Q(initially) = 1 RESET = 1


/0
SET -----+------------------------|
| |NAND--+ \1
+-------| \1 +--| | /2x
|NAND--+-----+ |
+--| | |
| | |
+----------|--+ |
| | |
+----------+ | |
| | |
+--| =1 | |
|NAND-----+ |
=0 +-------| +--| Q
| |NAND--+------- =1
+--------------------------------+--| |
| |
+----------|--+
| |
+----------+ |
| | _
+--------------------------------+--| | Q
| |NAND-----+---- =0
=1 +-------| +--|
|NAND--+ =1 |
+--| | |
| | |
+----------|--+ |
| | |
+----------+ | |
| | |
+--| =0 | |
|NAND-----+--+ |
+-------| +--| |
=1 | |NAND--+ =1
RESET -----+------------------------|


--

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