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M48Z35-70PC1 NVRAM for CSA803 & 11801 E5622 error

 

I have been unable to find anyone who has these in stock selling just 2. I've checked Digikey, Mouser, Newark, Arrow, and any other places google turned up. ST said Arrow has them, but Arrow says otherwise.

Futureelectronics.com says they have them for $13.50 each, but with a 12 piece minimum.

There are lots of them on eBay from China, some with 1999 date codes. And I wouldn't trust more recent date codes on anything from China. Far too much history of remarking.

These are the cure for E5622. Is anyone else interested in getting a pair? If so, please contact me off list.

I'm in Arkansas so it would cost $3.50 for me to ship them priority mail. So a fresh pair would be $30.50 shipped. These seem to have a useful life of 5-10 years. I had to replace NVRAM in a Sun workstation in the past. So I'm all too familiar with these things.

Reg
 



These are what I use. They are due in in June.

On 3/10/2019 2:10 PM, Reginald Beardsley via Groups.Io wrote:
I have been unable to find anyone who has these in stock selling just 2. I've checked Digikey, Mouser, Newark, Arrow, and any other places google turned up. ST said Arrow has them, but Arrow says otherwise.

Futureelectronics.com says they have them for $13.50 each, but with a 12 piece minimum.

There are lots of them on eBay from China, some with 1999 date codes. And I wouldn't trust more recent date codes on anything from China. Far too much history of remarking.

These are the cure for E5622. Is anyone else interested in getting a pair? If so, please contact me off list.

I'm in Arkansas so it would cost $3.50 for me to ship them priority mail. So a fresh pair would be $30.50 shipped. These seem to have a useful life of 5-10 years. I had to replace NVRAM in a Sun workstation in the past. So I'm all too familiar with these things.

Reg
 

RS Components are showing 36 ex-stock at 11.99 GBP each in the UK if that's any help?

On 3/10/2019 6:31 PM, Tom Miller wrote:


These are what I use. They are due in in June.



On 3/10/2019 2:10 PM, Reginald Beardsley via Groups.Io wrote:
I have been unable to find anyone who has these in stock selling just 2.? I've checked Digikey, Mouser, Newark, Arrow, and any other places google turned up.? ST said Arrow has them, but Arrow says otherwise.

Futureelectronics.com says they have them for $13.50 each, but with a 12 piece minimum.

There are lots of them on eBay from China, some with 1999 date codes.?? And I wouldn't trust more recent date codes on anything from China.? Far too much history of remarking.

These are the cure for E5622.? Is anyone else interested in getting a pair?? If so, please contact me off list.

I'm in Arkansas so it would cost $3.50 for me to ship them priority mail.? So a fresh pair would be $30.50 shipped.? These seem to have a useful life of 5-10 years.? I had to replace NVRAM in a Sun workstation in the past.? So I'm all too familiar with these things.

Reg
 

RS wouldn't allow me to enter any country except the UK when I tried to buy a couple.

Digikey says they'll have them in late May. I'm sure ST only makes a small run, probably just once a year, because of the shelf life issue.

I asked a NA eBay seller about the origin and date code of their stock. Came from a defunct distributor, but have a 2002 date code.

Unfortunately, with Farnell and their many names and websites, there is no telling where their stock is. If shipment is by sea from the UK it might still take until June :-(

so it looks as if I'm just going to have to wait.
 

I'm happy to get a couple and mail them to you if that helps?

Adrian

On 3/11/2019 2:17 PM, Reginald Beardsley via Groups.Io wrote:
RS wouldn't allow me to enter any country except the UK when I tried to buy a couple.

Digikey says they'll have them in late May. I'm sure ST only makes a small run, probably just once a year, because of the shelf life issue.

I asked a NA eBay seller about the origin and date code of their stock. Came from a defunct distributor, but have a 2002 date code.

Unfortunately, with Farnell and their many names and websites, there is no telling where their stock is. If shipment is by sea from the UK it might still take until June :-(

so it looks as if I'm just going to have to wait.
 

Reg,

There might be a more elegant solution possible. The problem of battery ram
was discussed at length in the pinball forums, and people made other
solutions for it. Permanent ones. No battery to replace EVER.

For example:

Now, I couldn't find a 32Kx8 variant, but the RAMTRON chip you'd likely
need is the FM1808. Mouser seems to have it in stock, but at a pretty hefty
price, and you'd have to make the breakout board still (JLPCB maybe?)
There seems to be stock on eBay for lower prices from US sellers...

Just a thought, make a breakout, put a SMD variant of the FM1808 plus
possibly some circuitry on it, and be done with it. No battery to deplete
anymore... You might even be able to find a DIP variant of it, and it looks
to be pin compatible...

There are some differences though, CE needs to be strobed. The datasheet
will tell the details...

Maurice

On Mon, Mar 11, 2019 at 8:33 AM Adrian <Adrian@...> wrote:

I'm happy to get a couple and mail them to you if that helps?

Adrian

On 3/11/2019 2:17 PM, Reginald Beardsley via Groups.Io wrote:
RS wouldn't allow me to enter any country except the UK when I tried to
buy a couple.

Digikey says they'll have them in late May. I'm sure ST only makes a
small run, probably just once a year, because of the shelf life issue.

I asked a NA eBay seller about the origin and date code of their stock.
Came from a defunct distributor, but have a 2002 date code.

Unfortunately, with Farnell and their many names and websites, there is
no telling where their stock is. If shipment is by sea from the UK it
might still take until June :-(

so it looks as if I'm just going to have to wait.
 

On Thu, Mar 14, 2019 at 09:28 PM, Maurice Smulders wrote:

There might be a more elegant solution possible. The problem of battery ram
was discussed at length in the pinball forums, and people made other
solutions for it. Permanent ones. No battery to replace EVER.

For example:

Now, I couldn't find a 32Kx8 variant, but the RAMTRON chip you'd likely
need is the FM1808. Mouser seems to have it in stock, but at a pretty hefty
price, and you'd have to make the breakout board still (JLPCB maybe?)
There seems to be stock on eBay for lower prices from US sellers...
I've done exactly this to my 2430A. I've replaced both of the dead Dallas NVRAM chips with Cirrus FM18W08 FRAMs in off-the-shelf SOIC to DIP converters (Aries LCQT-SOIC28), all bought from Farnell in the UK. The conversion works perfectly as far as I can tell, and the scope will never have dead batteries again.

One day I might try the same trick on my CSA803A.

Chris

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