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
Looking for a decade counter -or- divider ?
Started by ●January 25, 2022
Reply by ●January 25, 20222022-01-25
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.
Reply by ●January 25, 20222022-01-25
On 1/25/2022 9:51 AM, Sid 03 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 ?You *only* care about the resulting output pulse-train (which can be shaped to a square wave)? Not any of the intermediate outputs? Do you care about the exact phase relationship with the input clock? Must the divisor always be (exactly) 10/100? What clock rates are you planning on working with? Supply voltages? (presumably, you want COTS "components" and not an integrated solution like an FPGA)
Reply by ●January 25, 20222022-01-25
Ralph Mowery schrieb:> 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.For dividing by 100 one needs just a single 74x390 which contains two divide-by-10 counters. HTH Reinhard
Reply by ●January 25, 20222022-01-25
On Tue, 25 Jan 2022 08:51:40 -0800 (PST), 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. >ThanksHCT390 should work. It's a dual ripple counter. Maybe use a schmitt gate in front to get a clean clock, depending on what you want to count. -- I yam what I yam - Popeye
Reply by ●January 25, 20222022-01-25
On a sunny day (Tue, 25 Jan 2022 08:51:40 -0800 (PST)) it happened Sid 03 <sidwelle@gmail.com> wrote in <df6f7519-d347-4a84-b677-39ec12552f65n@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. >Thanks2 x 74[HCT]90 in series will do that, gives you BCD output too.
Reply by ●January 25, 20222022-01-25
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: > >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 > 2 x 74[HCT]90 in series will do that, gives you BCD output too.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 ? Thanks
Reply by ●January 25, 20222022-01-25
On 1/25/2022 2:03 PM, Sid 03 wrote:> 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: >>> 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 >> 2 x 74[HCT]90 in series will do that, gives you BCD output too. > > 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 ?As you are being (deliberately) imprecise, I guess we can offer solutions that are equally imprecise: "Sure! Use an 8 pin MCU in a SOIC8!"
Reply by ●January 25, 20222022-01-25
On 2022-01-25 17:51, Sid 03 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. > ThanksThe 74[[HC]T]390 had two decade counters, when the two are combined it can divide by 10 and at the same time by 100. Isn't that what you want? Or do you want to divide by 10, 100, 1000 and 10000 (the quad case)? Arie
Reply by ●January 25, 20222022-01-25
On Tuesday, January 25, 2022 at 8:51:44 AM UTC-8, 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.Even years ago, 'decade' was just a special case of counter, there's many 16-bit timer/counters that will handle /10, /100, /1000, /10000 easily, and low-end controllers typically have several such as onboard peripherals. AT89C55 has three, in addition to compute and I/O resources to use them. Do you accept output synchronous with a CPU clock? Is this for some UHF divider purpose? There's lots of hardware not sold as 'counter' that will do the task or useful parts of it, just as there's lots of A to D converters that don't come with the ADC label.
