Decade counter:
I am looking for a decade counter, I found some on-line like the 4017 and 74HC[T]390.
But I am now sure any of those are what I want. At my previous job we use to have quad decade counters in one chip available. That has been a few years ago and not sure where to look now.
What I want to be able to do is tie at least two of them end to end and get a divider of 10 and 100.
Maybe the terminology is wrong and I should be looking for a divider ?
Decade counter: I am looking for a decade counter, I found some on-line like the 4017 and 74HC[T]390. But I am now sure any of those are what I
want. At my previous job we use to have quad decade counters in one chip available. That has been a few years ago and not sure where to look now. What I want to be able to do is tie at least two of them end to end and get
a divider of 10 and 100. Maybe the terminology is wrong and I should be looking for a divider ?
In article <df6f7519-d347-4a84-b677-39ec12552f65n@googlegroups.com>, sidwelle@gmail.com says...
Decade counter:
I am looking for a decade counter, I found some on-line like the 4017 and 74HC[T]390.
But I am now sure any of those are what I want. At my previous job we use to have quad decade counters in one chip available. That has been a few years ago and not sure where to look now.
What I want to be able to do is tie at least two of them end to end and get a divider of 10 and 100.
Maybe the terminology is wrong and I should be looking for a divider ?
If all you need to do is divide by 10 and 100 look at a 7490. It has 2 sections as I recall. One divides by 2 and the other by 5 so you hook
them up in series. Usually the divide by 2 is the last so you get a
better transistion . YOu can put 2 in series to divide by 100.
Decade counter:
I am looking for a decade counter, I found some on-line like the 4017 and 74HC[T]390.
But I am now sure any of those are what I want. At my previous job we use to have quad decade counters in one chip available. That has been a few years ago and not sure where to look now.
What I want to be able to do is tie at least two of them end to end and get a divider of 10 and 100.
Maybe the terminology is wrong and I should be looking for a divider ?
Any help is appreciated.
Thanks
Decade counter:
I am looking for a decade counter, I found some on-line like the 4017 and 74HC[T]390.
But I am now sure any of those are what I want. At my previous job we use to have quad decade counters in one chip available.
That has been a few years ago and not sure where to look now.
What I want to be able to do is tie at least two of them end to end and get a divider of 10 and 100.
Maybe the terminology is wrong and I should be looking for a divider ?
Any help is appreciated.
Thanks
On a sunny day (Tue, 25 Jan 2022 08:51:40 -0800 (PST)) it happened Sid 03 <sidw...@gmail.com> wrote in
<df6f7519-d347-4a84...@googlegroups.com>:
Decade counter:
I am looking for a decade counter, I found some on-line like the 4017 and 74HC[T]390.
But I am now sure any of those are what I want. At my previous job we use to have quad decade counters in one chip available.
That has been a few years ago and not sure where to look now.
What I want to be able to do is tie at least two of them end to end and get a divider of 10 and 100.
Maybe the terminology is wrong and I should be looking for a divider ?
Any help is appreciated.2 x 74[HCT]90 in series will do that, gives you BCD output too.
Thanks
On Tuesday, January 25, 2022 at 11:36:10 AM UTC-6, Jan Panteltje wrote:
On a sunny day (Tue, 25 Jan 2022 08:51:40 -0800 (PST)) it happened Sid 03
<sidw...@gmail.com> wrote in
<df6f7519-d347-4a84...@googlegroups.com>:
Decade counter:2 x 74[HCT]90 in series will do that, gives you BCD output too.
I am looking for a decade counter, I found some on-line like the 4017 and 74HC[T]390.
But I am now sure any of those are what I want. At my previous job we use to have quad decade counters in one chip available.
That has been a few years ago and not sure where to look now.
What I want to be able to do is tie at least two of them end to end and get a divider of 10 and 100.
Maybe the terminology is wrong and I should be looking for a divider ?
Any help is appreciated.
Thanks
So either the 4017 or the 390 will do the job, but in either scenario I will need 2 chips ?
Is there a chip out there that will do it all in one chip ?
Decade counter:
I am looking for a decade counter, I found some on-line like the 4017 and 74HC[T]390.
But I am now sure any of those are what I want. At my previous job we use to have quad decade counters in one chip available. That has been a few years ago and not sure where to look now.
What I want to be able to do is tie at least two of them end to end and get a divider of 10 and 100.
Maybe the terminology is wrong and I should be looking for a divider ?
Any help is appreciated.
Thanks
Decade counter:
I am looking for a decade counter, I found some on-line like the 4017 and 74HC[T]390.
But I am now sure any of those are what I want. At my previous job we use to have quad decade counters in one chip available. That has been a few years ago and not sure where to look now.
Decade counter:
I am looking for a decade counter, I found some on-line like the 4017 and 74HC[T]390.
But I am now sure any of those are what I want. At my previous job we use to have quad decade counters in one chip available. That has been a few years ago and not sure where to look now.
What I want to be able to do is tie at least two of them end to end and get a divider of 10 and 100.
Maybe the terminology is wrong and I should be looking for a divider ?
Any help is appreciated.
On Tuesday, January 25, 2022 at 7:45:11 PM UTC-6, bill....@ieee.org wrote:all that powerful).
On Wednesday, January 26, 2022 at 3:51:44 AM UTC+11, sidw...@gmail.com wrote:
Decade counter:
I am looking for a decade counter, I found some on-line like the 4017 and 74HC[T]390.
But I am now sure any of those are what I want. At my previous job we use to have quad decade counters in one chip available. That has been a few years ago and not sure where to look now.
What I want to be able to do is tie at least two of them end to end and get a divider of 10 and 100.
Maybe the terminology is wrong and I should be looking for a divider ?
Any help is appreciated.The market for long counters in a single package probably went away when programmable logic chips came along. Something out of the Xilinx Coolrunner range could probably be programmed to do you job without needing much supply current.
https://www.xilinx.com/products/silicon-devices/cpld/coolrunner-ii.html
I've used an ICT PA7024 electrically erasable programmable logic array to do that kind of job, but that was nearly thirty years ago - the charm of the PA7024 was that was a drop-in replacement for the 22V10 part, but appreciably more powerful (if not
--I posted here because I don't know much about the counters and wanted some advice.
Bill Sloman, Sydney
This is just a project to try and measure the revolutions of a pump.
I see alot of these on-line as "CD74HC390E".
If someone could help me decode the prefix 'CD' and suffix 'E' that would be a big help as well.
On Wednesday, January 26, 2022 at 3:51:44 AM UTC+11, sidw...@gmail.com wrote:all that powerful).
Decade counter:
I am looking for a decade counter, I found some on-line like the 4017 and 74HC[T]390.
But I am now sure any of those are what I want. At my previous job we use to have quad decade counters in one chip available. That has been a few years ago and not sure where to look now.
What I want to be able to do is tie at least two of them end to end and get a divider of 10 and 100.
Maybe the terminology is wrong and I should be looking for a divider ?
Any help is appreciated.The market for long counters in a single package probably went away when programmable logic chips came along. Something out of the Xilinx Coolrunner range could probably be programmed to do you job without needing much supply current.
https://www.xilinx.com/products/silicon-devices/cpld/coolrunner-ii.html
I've used an ICT PA7024 electrically erasable programmable logic array to do that kind of job, but that was nearly thirty years ago - the charm of the PA7024 was that was a drop-in replacement for the 22V10 part, but appreciably more powerful (if not
--
Bill Sloman, Sydney
On Tuesday, January 25, 2022 at 7:45:11 PM UTC-6, bill....@ieee.org wrote:all that powerful).
On Wednesday, January 26, 2022 at 3:51:44 AM UTC+11, sidw...@gmail.com wrote:
Decade counter:
I am looking for a decade counter, I found some on-line like the 4017 and 74HC[T]390.
But I am now sure any of those are what I want. At my previous job we use to have quad decade counters in one chip available. That has been a few years ago and not sure where to look now.
What I want to be able to do is tie at least two of them end to end and get a divider of 10 and 100.
Maybe the terminology is wrong and I should be looking for a divider ?
Any help is appreciated.The market for long counters in a single package probably went away when programmable logic chips came along. Something out of the Xilinx Coolrunner range could probably be programmed to do you job without needing much supply current.
https://www.xilinx.com/products/silicon-devices/cpld/coolrunner-ii.html
I've used an ICT PA7024 electrically erasable programmable logic array to do that kind of job, but that was nearly thirty years ago - the charm of the PA7024 was that was a drop-in replacement for the 22V10 part, but appreciably more powerful (if not
I posted here because I don't know much about the counters and wanted some advice.
This is just a project to try and measure the revolutions of a pump.
I see a lot of these on-line as "CD74HC390E".
If someone could help me decode the prefix 'CD' and suffix 'E' that would be a big help as well.
I posted here because I don't know much about the counters and wanted some advice.
This is just a project to try and measure the revolutions of a pump.
I see alot of these on-line as "CD74HC390E".
If someone could help me decode the prefix 'CD' and suffix 'E' that would be a big help as well.
Decade counter:
I am looking for a decade counter, I found some on-line like the
4017 and 74HC[T]390. But I am now sure any of those are what I want.
At my previous job we use to have quad decade counters in one chip available.
That has been a few years ago and not sure where to look now.
What I want to be able to do is tie at least two of them end to end
and get a divider of 10 and 100.
On 1/25/2022 7:31 PM, Sid 03 wrote:
I posted here because I don't know much about the counters and wanted some advice.
This is just a project to try and measure the revolutions of a pump.
So, it's a dead slow input signal.
Are you interested in getting "nice" (human readable) numbers? Or,
just driving the output frequency down?
I.e., unless the pump emits "X*100 pulses per revolution" (in which case, dividing by 100 would give you "X revolutions"), you may, instead, want
to pick a divisor that directly gives you a number that is easier to "consume".
E.g., if you are wanting "RPM" and wanted to update your "data" every second,
you'd be looking to reduce:
N pulses per revolution / 60
So, if the pump produced 100 pulses per revolution and you observed 100 pulses
*in* that second, you would know that the pump was rotating at 60 RPM. If your frequency divisor divided by (100 / 60), you would directly see that result.
Or, if one revolution moved M units of liquid (?), you could normalize
your output to directly yield units per minute, hour, etc. by an appropriate choice of frequency divisor.
If you don't care about "nice units", then you can divide by anything that drives the output frequency low enough to be directly observable (with whatever you have "watching" this output). In which case, you can pick
any old ripple counter and use it.
I see alot of these on-line as "CD74HC390E".The prefix is chosen by the vendor of the part. CD was RCA, SN was TI, MC was
If someone could help me decode the prefix 'CD' and suffix 'E' that would be a big help as well.
Motogorilla, MM for Nat Semi, etc. (note vendors can choose multiple different
prefixes... *hopefully* without conflict with other vendors!).
The suffix often indicates a set of operating conditions -- temperature range,
accuracy, supply voltage tolerances, etc.
Sometimes, there may also be additional suffixes -- like "dash numbers" to indicate speed ranges.
The "HC" embedded in the part number often indicates a logic family (high speed
CMOS... as the original CMOS parts were typically pretty pokey).
The numeric portion of the part number defines the actual functionality
of the part. "In general" (ha!), a xx74yy###zzz from any manufacturer
will be the same basic part fabricated in different technologies, speed grades, etc.
Note that a manufacturer need not follow this "rule". They are free to
offer THEIR parts under whatever numbering scheme *they* develop. So,
you might find a particular *functionality* in MECL III with an entirely different part number than 100K ECL, etc. A vendor has control over the
part numbers he offers. And, can even change the part numbers of
existing products to suit his fancy (e.g., the NS16032 magically became
the NS32016, overnight!)
[There have been some annoying deviations from this "rule" -- most notably the early 27xx EPROMs where it was crucial to specify a vendor AND a
part number instead of just a "generic" part number]
On 2022-01-25, Sid 03 <sidwelle@gmail.com> wrote:
Decade counter:
I am looking for a decade counter, I found some on-line like the
4017 and 74HC[T]390. But I am now sure any of those are what I want.
At my previous job we use to have quad decade counters in one chip available.
I seem to remember a triple or quad with muliplexed BCD output, but
IIRC they stopped making them last century.
Jasen Betts wrote:
On 2022-01-25, Sid 03 <sidwelle@gmail.com> wrote:
Decade counter:
I am looking for a decade counter, I found some on-line like the
4017 and 74HC[T]390. But I am now sure any of those are what I want.
At my previous job we use to have quad decade counters in one chip
available.
I seem to remember a triple or quad with muliplexed BCD output, but
IIRC they stopped making them last century.
Interesil used to make frequency counter chips like that, and AD
actually still sells the ICM7217 four-digit decade counter. Of course
it's $21 and has muxed 7-segment outputs, but hey, it's a quad decade counter. ;)
Cheers
Phil Hobbs
On Tuesday, January 25, 2022 at 7:45:11 PM UTC-6, bill....@ieee.org wrote:all that powerful).
On Wednesday, January 26, 2022 at 3:51:44 AM UTC+11, sidw...@gmail.com wrote:
Decade counter:The market for long counters in a single package probably went away when programmable logic chips came along. Something out of the Xilinx Coolrunner range could probably be programmed to do you job without needing much supply current.
I am looking for a decade counter, I found some on-line like the 4017 and 74HC[T]390.
But I am now sure any of those are what I want. At my previous job we use to have quad decade counters in one chip available. That has been a few years ago and not sure where to look now.
What I want to be able to do is tie at least two of them end to end and get a divider of 10 and 100.
Maybe the terminology is wrong and I should be looking for a divider ?
Any help is appreciated.
https://www.xilinx.com/products/silicon-devices/cpld/coolrunner-ii.html
I've used an ICT PA7024 electrically erasable programmable logic array to do that kind of job, but that was nearly thirty years ago - the charm of the PA7024 was that was a drop-in replacement for the 22V10 part, but appreciably more powerful (if not
--
Bill Sloman, Sydney
I posted here because I don't know much about the counters and wanted some advice.
This is just a project to try and measure the revolutions of a pump.
I see alot of these on-line as "CD74HC390E".
If someone could help me decode the prefix 'CD' and suffix 'E' that would be a big help as well.
Decade counter:
I am looking for a decade counter, I found some on-line like the 4017
and 74HC[T]390. But I am now sure any of those are what I want. At my previous job we use to have quad decade counters in one chip available.
That has been a few years ago and not sure where to look now. What I
want to be able to do is tie at least two of them end to end and get a divider of 10 and 100. Maybe the terminology is wrong and I should be looking for a divider ?
Any help is appreciated.
Thanks
Sid 03 <sidwelle@gmail.com> wrote:
Decade counter:
I am looking for a decade counter, I found some on-line like the 4017
and 74HC[T]390. But I am now sure any of those are what I want. At my
previous job we use to have quad decade counters in one chip available.
That has been a few years ago and not sure where to look now. What I
want to be able to do is tie at least two of them end to end and get a
divider of 10 and 100. Maybe the terminology is wrong and I should be
looking for a divider ?
Any help is appreciated.
Thanks
Tom Van Baak published a list of PIC counters that give various ratios,
such as 1e7 (10MHz to 1Hz) with jitter under 2ps. Here is a list with
source code:
picDIV -- Single Chip Frequency Divider >http://www.leapsecond.com/pic/picdiv.htm
PIC divider jitter measurement
http://www.leapsecond.com/pic/jitter/
He also posted a different version to time events:
picPET -- Precision Event Timer, more versions >http://leapsecond.com/pic/picpet2.htm
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