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Sets, Parts and Service Information Wanted (private buyers only, no swaps) If you need help obtaining components, sets or equipment, post a message here. Private buyers only - no traders. No swaps.

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Old 22nd Nov 2022, 3:07 pm   #1
veedub565
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Default Wanted: Motorola 1820-0413 divide by 10 counter

If anybody has one I can buy, or can suggest a modern equivalent, I'm in need of a 1820-0413 Frequency divider to repair my HP 5326B frequency counter.

I believe it's an 8 pin gated divide by 10 counter, it takes 10MHz in, and outputs 1MHz
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Old 22nd Nov 2022, 6:06 pm   #2
factory
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Default Re: Wanted: Motorola 1820-0413 divide by 10 counter

They are on ebay, but pricey (as "1820-0413").

Here is the information from the manual, note the pinout for each half.
Click image for larger version

Name:	HP 1820-0413.jpg
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David
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Old 22nd Nov 2022, 6:58 pm   #3
factory
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Default Re: Wanted: Motorola 1820-0413 divide by 10 counter

Possible idea to replace them with 74HCT390 and some extra logic gates for the gating, but it never got updated, also not sure they are connected right for divide-by-10 in the CAD design.
https://www.eevblog.com/forum/testge...erdvm-problem/

Looking at the parts list the 0412 & 0413 seem the same, apart from the 0413 is selected for minimum 12.5MHz rating.

David
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Old 22nd Nov 2022, 7:36 pm   #4
veedub565
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Default Re: Wanted: Motorola 1820-0413 divide by 10 counter

I did find the one on ebay, works out around 24 I think with postage. 0412 similar sort of price. Original part would be better, Might have to use the 74HCT390 or similar and adapt it to fit though. It's the one on A14 board that divides the 10MHz down to 1MHz for the DVM logic. 10MHz in but no 1MHz out.

I'm debating whether to replace the PSU caps too.
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Old 22nd Nov 2022, 8:10 pm   #5
Cruisin Marine
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Default Re: Wanted: Motorola 1820-0413 divide by 10 counter

Contact Jotrin, in my experience they are more reasonable than the other suppliers.
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Old 23rd Nov 2022, 12:27 am   #6
Maarten
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Default Re: Wanted: Motorola 1820-0413 divide by 10 counter

Isn't there an original Motorola equivalent, as this is the HP house number?
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Old 23rd Nov 2022, 10:00 am   #7
veedub565
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Default Re: Wanted: Motorola 1820-0413 divide by 10 counter

Quote:
Originally Posted by Maarten View Post
Isn't there an original Motorola equivalent, as this is the HP house number?
Possibly, NSN is 5962-00-009-6621and shows them being manufactured by various companies
HP
Agilent
Freescale semiconductors

Not Motorola weirdly
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Old 23rd Nov 2022, 10:17 am   #8
tony brady
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Default Re: Wanted: Motorola 1820-0413 divide by 10 counter

Motorolas chip business was renamed as Freescale, I think about 20 years ago
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Old 23rd Nov 2022, 2:06 pm   #9
factory
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Default Re: Wanted: Motorola 1820-0413 divide by 10 counter

Probably a custom spec/pinout part for HP, some HP 1820-xxxx parts were standard parts, but quite a lot of ICs in these older counters are custom, some use negative logic to add to the confusion.
Currently got designs almost ready to have some boards made, for two out of three ICs on the display board, there will be two designs for each due to space limitations in different counters.

Looking at the 5326/27 I have, they have a 16 pin space on the A14 board for U1, but only use the 8 pin 0413 IC, the manuals shows the earlier ones had a 16 pin 1820-0227 in it's place.

You have two choices, as it's only a single divide by ten IC and doesn't use any of the extra reset/gate functions, a 74LS90 would do if you want to make an adaptor board.

Or, I could have a look at the spares 5327 here and take one from the A5 board, looking at my pictures A14 is missing. Edit: will have to design a replacement board at some point, seems to be mostly Motorola DTL AND, NAND & OR gates on that board, plus the divider IC, would like to get it working again someday.

The 74HCT390 (more useful for repairing the A5 timebase board) is two 74HCT90s in a single IC, except there doesn't seem to be a HCT version of the 7490, it does appear in datasheets but isn't stocked anywhere.

The PSU caps are mostly original in mine, except one that broke off during shipping.

David

Last edited by factory; 23rd Nov 2022 at 2:14 pm.
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Old 24th Nov 2022, 8:23 pm   #10
veedub565
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Default Re: Wanted: Motorola 1820-0413 divide by 10 counter

I see a lot of old equipment going in the bin at work. I do try to salvage interesting things where possible. Or at least salvage parts from them, I've got a load of NOS Tek parts, and some custom HP pulls amongst other things. Was hoping I might have one of these, but no (isn't it always the case)

Will have a look into the 74LS90, can't imagine it will be too hard to make it work.

Let me know if you need pictures, measurements or anything for the A14 board.
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Old 26th Nov 2022, 9:21 pm   #11
factory
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Default Re: Wanted: Motorola 1820-0413 divide by 10 counter

Thank you for offering to help with measurements, it was the spares 5327 that was missing A14 (my working 5326/7 have the same board), that was the reason it wasn't repaired, but I've since learnt KiCAD and have a source of a pair of covers (from the PP auction junk) for this 5327. Also looking at the back it's labelled 9500D-221, this was part of one of HP computer measurement systems, which explains the rear inputs for the both the counter & DVM. Also I forgot I replaced the PSU caps with good used ones, for testing as some were missing and it's had a lot of use.

Our internet has been barely usable for the last couple of days, had plenty of free time in the evening to play with the CAD, here is my version of A14.
Click image for larger version

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Just need to figure out which 74 series ICs can replace the Motorola MDTL logic gates, they are available but not at sensible prices.
Also need to do the adaptor board for the 7490.

P.S. Unless your work had any 1960s designed HP kit, it's unlikely you would find any of the parts, the 1972 designed 5340 used 7490 divider ICs for example.

David
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Old 26th Nov 2022, 9:50 pm   #12
Cruisin Marine
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Default Re: Wanted: Motorola 1820-0413 divide by 10 counter

There will be plenty of say appropriate 74HC type chips that will be available at a reasonable price that will work above 10 MHz, you won't have to fork out for an expensive pre-scaler that works up to hundreds of megs.
From memory the 4018 did divide by ten (but I don't know if there is a higher frequency 74HC version?), but not easy to locate, maybe the 74HC390 may be your answer via a bit of modification?
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Last edited by Cruisin Marine; 26th Nov 2022 at 10:00 pm.
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Old 29th Nov 2022, 8:10 am   #13
veedub565
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Default Re: Wanted: Motorola 1820-0413 divide by 10 counter

Quote:
Originally Posted by factory View Post
P.S. Unless your work had any 1960s designed HP kit, it's unlikely you would find any of the parts, the 1972 designed 5340 used 7490 divider ICs for example.

David
You'd be surprised what we get through the door here. We still get counters with nixies coming in for calibration. Someone sent us a power meter for repair and cal a while back, dated 1943 and evidently still in use.

One of my friends has made up a small daughter board using a 74LS90N which divides 10MHz down to 1MHz, so we'll see if that works.
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