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PA2AGA > HDDIG 04.06.00 21:36l 251 Lines 6809 Bytes #-9457 (0) @ EU
BID : HD_2000_155B
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Subj: HamDigitalDigest 2000/155B
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Sent: 000604/1631Z @:PI8HGL.#ZH1.NLD.EU #:47578 [Den Haag] FBB $:HD_2000_155B
From: PA2AGA@PI8HGL.#ZH1.NLD.EU
To : HDDIG@EU
Date: Sat, 03 Jun 00 14:51:21 MET
Message-Id: <hd_2000_155B>
From: pa2aga@pe1mvx.ampr.org
To: hd_broadcast@pa2aga.ampr.org
X-BBS-Msg-Type: B
> 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
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).
>
> I'd be a little cautious, since there are more and more 3.3V chips out
these days
> that might not tolerate 5V.
>
> --
> Dana K6JQ DoD #j
> dana@source.net
>
>
------------------------------
Date: Fri, 2 Jun 2000 12:54:51 -0400
From: "Rob" <Pse@NoEmail.Com>
Subject: Help -- 128 KB SRAM Chip
Many thanks for the link.
I will use the Hyundi SRAM chip. It is about half the price of most
compatible SRAM chips.
It costs less than $10 US.
73's
Rob
"Rick Haub" <rhaub@midwestmicro-tek.com> wrote in message
news:3937C9E8.121A443C@midwestmicro-tek.com...
> The HY628100A is not a Hitachi part but a Hyundai part. Go here for a PDF
data
> sheet.
>
> http://kcs.hei.co.kr/models/sram/sramcomp/1M/HY628100B.PDF
>
> This part only comes in the SOP and TSOP-1 package (according to Hyundai).
I'm
> assuming that your's is in a plastic DIP package? If so you can get a
similar
> part from BG micro for cheep.
>
> Rick KC0GIX
>
> Rob wrote:
>
> > Hi,
> >
> > I would like to upgrade the static RAM (SRAM) chip in my KPC-3.
> >
> > I need a SRAM chip (part number S628128-70L).
> > They are sold out in this area. There are on back order -- probably at
> > least 4 weeks before they show up. KANTRONICS sells them but they are
way
> > TOO expensive. Talk about a mark-up!
> >
> > I can buy a 128 KB SRAM low-low power chip (part number S628128-70LL
such as
> > Hitachi HY628100A LLP-70). It is even less expensive.
> >
> > Does anyone know what the difference is between the S628128-70L chip and
the
> > S628128-70LL chip??
> >
> > Can I use the S628128-70LL in the KPC-3??
> >
> > 73's
> > Rob
>
------------------------------
Date: Fri, 2 Jun 2000 12:58:04 -0400
From: "Rob" <Pse@NoEmail.Com>
Subject: Help -- 128 KB SRAM Chip
Hi Randy,
I just found out that the chip is a Hyundai chip NOT an Hitachi chip.
Details are at http://kcs.hei.co.kr/models/sram/sramcomp/1M/HY628100B.PDF
You were very close. The standby current in the Hyundai chip is 20 ua. It
should work great with a KPC-3! It also costs a lot less.
73's
Rob
"Randall Gawtry" <rgawtry@timewave.com> wrote in message
news:8h8hjq$th$1@newsfeed.minn.net...
> Rob,
> I checked in some of our archive Hitachi data books. While I didn't find
the
> precise part you mentioned, generally Hitachi medium speed SRAM with an LL
> suffix is low power standby current (spec'ed at 15 uA vs. 50 uA normal).
We
> have used this type of SRAM in various projects over the years and have
had no
> problem with the LL or equivalent version from any manufacturer. (Backup
> batteries last longer and resetting the SRAM to all zeros by pulling the
> battery may take a lot longer!)
> Most ICs are in very short supply at this point, so you will find problems
> obtaining many parts at low prices with fast delivery.
>
> 73,
> Randy Gawtry
> Timewave Technology Inc.
>
>
> In article <5BDZ4.4776$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: 03 Jun 2000 01:11:17 GMT
From: johnl84238@aol.com (JOHNL84238)
Subject: Help -- 128 KB SRAM Chip
Take a look at ZMD-America.....their
distributor is All American Semiconductor......ZMD specializes in a
lot of the older lower density SRAMs that
Hitachi and others have discontinued.
You can find them on the web at
www.zmda.com
------------------------------
Date: Fri, 02 Jun 2000 07:57:14 -0500
From: Meg and JoAnne Maenpaa <maenpaa@corecomm.net>
Subject: N0ZO no longer supports Keyboard inputs!
Hi Rob,
> I think you are completely wrong here. Anyone can develop
> applications that use today's webserver/browser technology,
> which is layered on top of TCP/IP. It is simple to write perl
> or php scripts that run on Apache, or scripts that are run by
> Roxen, or on Microsoft IIS.
Hey! Thanks for the great advice! I now know what to tell the
Director of the Office of Emergency Management the next time he
is looking for technological support from the amateur radio
To be continued in digest: hd_2000_155C
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