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Date: Sat, 03 Jun 00 14:51:26 MET
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Packet-Radio Digest Sat, 3 Jun 2000 Volume 2000 : Issue 140
Today's Topics:
Help -- 128 KB SRAM Chip (6 msgs)
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----------------------------------------------------------------------
Date: Fri, 02 Jun 2000 14:48:39 GMT
From: rgawtry@timewave.com (Randall Gawtry)
Subject: Help -- 128 KB SRAM Chip
Rob,
I checked in some of our archive Hitachi data books. While I didn't find the
precise part you mentioned, generally Hitachi medium speed SRAM with an LL
suffix is low power standby current (spec'ed at 15 uA vs. 50 uA normal). We
have used this type of SRAM in various projects over the years and have had no
problem with the LL or equivalent version from any manufacturer. (Backup
batteries last longer and resetting the SRAM to all zeros by pulling the
battery may take a lot longer!)
Most ICs are in very short supply at this point, so you will find problems
obtaining many parts at low prices with fast delivery.
73,
Randy Gawtry
Timewave Technology Inc.
In article <5BDZ4.4776$qS3.12347@tor-nn1.netcom.ca>, "Rob" <Pse@NoEmail.Com>
wrote:
>There is no information on this chip on the Hitachi web site. Very strange.
>
>I sent Hitachi an Email. But perhaps someone reading this post may have had
>some actual experience with this type of chip.
>
>73's
>Rob
>
>"D. Stussy" <kd6lvw@bde-arc.ampr.org> wrote in message
>news:Pine.LNX.4.10.10006020011000.138-100000@mbx.bde-arc.ampr.org...
>> On Thu, 1 Jun 2000, Rob wrote:
>> > I would like to upgrade the static RAM (SRAM) chip in my KPC-3.
>> >
>> > I need a SRAM chip (part number S628128-70L).
>> > They are sold out in this area. There are on back order -- probably at
>> > least 4 weeks before they show up. KANTRONICS sells them but they are
>way
>> > TOO expensive. Talk about a mark-up!
>> >
>> > I can buy a 128 KB SRAM low-low power chip (part number S628128-70LL
>such as
>> > Hitachi HY628100A LLP-70). It is even less expensive.
>> >
>> > Does anyone know what the difference is between the S628128-70L chip and
>the
>> > S628128-70LL chip??
>> >
>> > Can I use the S628128-70LL in the KPC-3??
>>
>> Did you try Hitachi's web site? I bet the only difference is power
>consumption
>> (as in current drain).
>>
>
>
------------------------------
Date: Fri, 2 Jun 2000 08:48:55 -0700
From: "aa" <please-reply-2-group-n6vig@hotmail.com>
Subject: Help -- 128 KB SRAM Chip
try http://www.jameco.com/cfm/viewdesc.cfm?part_num=131810
"Rob" <Pse@NoEmail.Com> wrote in message
news:o8BZ4.4740$qS3.12544@tor-nn1.netcom.ca...
> Hi,
>
> I would like to upgrade the static RAM (SRAM) chip in my KPC-3.
>
> I need a SRAM chip (part number S628128-70L).
> They are sold out in this area. There are on back order -- probably at
> least 4 weeks before they show up. KANTRONICS sells them but they are way
> TOO expensive. Talk about a mark-up!
>
> I can buy a 128 KB SRAM low-low power chip (part number S628128-70LL such
as
> Hitachi HY628100A LLP-70). It is even less expensive.
>
> Does anyone know what the difference is between the S628128-70L chip and
the
> S628128-70LL chip??
>
> Can I use the S628128-70LL in the KPC-3??
>
> 73's
> Rob
>
>
------------------------------
Date: Fri, 02 Jun 2000 09:51:20 -0500
From: Rick Haub <rhaub@midwestmicro-tek.com>
Subject: Help -- 128 KB SRAM Chip
The HY628100A is not a Hitachi part but a Hyundai part. Go here for a PDF data
sheet.
http://kcs.hei.co.kr/models/sram/sramcomp/1M/HY628100B.PDF
This part only comes in the SOP and TSOP-1 package (according to Hyundai). I'm
assuming that your's is in a plastic DIP package? If so you can get a similar
part from BG micro for cheep.
Rick KC0GIX
Rob wrote:
> Hi,
>
> I would like to upgrade the static RAM (SRAM) chip in my KPC-3.
>
> I need a SRAM chip (part number S628128-70L).
> They are sold out in this area. There are on back order -- probably at
> least 4 weeks before they show up. KANTRONICS sells them but they are way
> TOO expensive. Talk about a mark-up!
>
> I can buy a 128 KB SRAM low-low power chip (part number S628128-70LL such as
> Hitachi HY628100A LLP-70). It is even less expensive.
>
> Does anyone know what the difference is between the S628128-70L chip and the
> S628128-70LL chip??
>
> Can I use the S628128-70LL in the KPC-3??
>
> 73's
> Rob
------------------------------
Date: Fri, 2 Jun 2000 13:00:40 -0400
From: "Rob" <Pse@NoEmail.Com>
Subject: Help -- 128 KB SRAM Chip
Hi Dana,
Thanks for the warning. But it was just pointed out to me that the chip is
made by Hyundai not Hitachi.
Details at http://kcs.hei.co.kr/models/sram/sramcomp/1M/HY628100B.PDF
It is a TTL chip. It looks like it will tolerate 5 volts just fine.
For a KPC-3, the LL low low power SRAM chips look great. And they cost a
lot less.
Rob
"Dana H. Myers K6JQ" <Dana@Source.Net> wrote in message
news:39374D76.B16CFAAA@Source.Net...
>
>
> "D. Stussy" wrote:
>
> > On Thu, 1 Jun 2000, Rob wrote:
> >
> > > I can buy a 128 KB SRAM low-low power chip (part number S628128-70LL
To be continued in digest: pr_2000_140B
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