[volt-nuts] HP-3458A NVRAM

[Dr. Frank]

Randy,

'quarks' is another volt-nuts companion.

His instrument is from 1989, and we both changed all nvSRAMs in our 3458As.

The complete designations are: DS1220AD-150+ and DS1230Y-150+.

If the 1230 battery fails, you will get failure messages on booting the 
3458A, and your stored settings and key function definitions will be 
lost, so that's a bit uncomfortable at most.


Frank

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Re: [volt-nuts] HP-3458A NVRAM

[Poul-Henning Kamp]

In message 

Re: [volt-nuts] HP-3458A NVRAM

[Randy Evans]

Frank,

Thanks for the information.  I was hoping to hear from someone that had
actually successfully used the DS1220AD in the 3458A.  I did not understand
the comment about the "instrument of 'quarks'", but it may be in regards to
the second set of DS1230Y NVRAMs?  Did you change those out to DS1230AD
NVRAMS also?

Thanks,

Randy

On Sat, Nov 11, 2017 at 6:31 AM, Dr. Frank 
wrote:

> Hello Randy,
>
> I have replaced the CAL-nvRAM by a DS1220AD-150 in 2013, as the Y version
> was not available.
>
> The speed was not the problem, but a slightly different supply volatge
> range, if I remeber correctly.
>
> My 3458A works w/o any problem, as does the instruments of 'quarks', who
> got the 2nd nvRAM which I have ordered.
>
> Frank
>
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Re: [volt-nuts] HP-3458A NVRAM

[Randy Evans]

Actually, it could make a difference depending on when the processor tries
to access the memory on start up.  The Maxim app note mentions that many
legacy programs designed for the DS1220Y may not work with the DS122AD,
hence the reason for the question.  I really would like to hear from
someone that has actually successfully replaced the DS1220Y with the
DS1220AD, since the DS1220Y is no longer avaialble..

On Fri, Nov 10, 2017 at 5:20 AM, Poul-Henning Kamp 
wrote:

> 
> In message  gmail.com>
> , Randy Evans writes:
>
> >Does anyone know if the DS1220AD will work as a direct replacement for
> >the DS1220Y
> >NVRAM chip currently installed in the HP-3458A?  There is a timing
> >difference between the two devices, as explained in Maxim AN 202.
>
> I don't think that difference will make any difference.
>
>
> --
> Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
> p...@freebsd.org | TCP/IP since RFC 956
> FreeBSD committer   | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
>
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Re: [volt-nuts] HP-3458A NVRAM

[Poul-Henning Kamp]

In message 
, Randy Evans writes:

>Does anyone know if the DS1220AD will work as a direct replacement for
>the DS1220Y
>NVRAM chip currently installed in the HP-3458A?  There is a timing
>difference between the two devices, as explained in Maxim AN 202.

I don't think that difference will make any difference.


-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer   | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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[volt-nuts] HP-3458A NVRAM

[Randy Evans]

Does anyone know if the DS1220AD will work as a direct replacement for
the DS1220Y
NVRAM chip currently installed in the HP-3458A?  There is a timing
difference between the two devices, as explained in Maxim AN 202.

"the "Y" parts had a reset timeout on the order of milliseconds while the
"AD"
parts have a timeout of 125ms. When replacing the Y part with the AD part,
it must be determined that
the controlling processor does not become active during a power-up cycle
for at least 125ms to ensure
that the NV SRAM is available before the processor attempts a memory
access."

There have been documented cases where the new DS1220AD part will not work
in circuits designed with the DS1220Y (now discontinued).

I would like to know if anyone has successfully utilized the DS1220AD
before proceeding to buy the parts.  Similar question for the DS1230Y and
DS1230AD.

Thanks,

Randy Evans
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