Discussion about the Korg PolySix synthesizer

On Sat, 2/6/16, jw_dewdney@yahoo.com [PolySix] <PolySix@yahoogroups.com> wrote:

Subject: [PolySix] POLYSIX SRAM CHIP REPLACEMENT?
To: PolySix@yahoogroups.com
Date: Saturday, February 6, 2016, 2:47 PM


 









Hi - I'm just putting the finishing touches on
one of Jed's 367 boards - and in my efforts to remove
the TC5514 chip with solder wick - i'm a bit worried
I've cooked the poor thing (though I haven't fired
it up yet - who knows what the long term effect will be on
the patches - i hear SRAM is particularly sensitive to lots
of factors).


At any rate - my question is this - I just
bought some replacement TC5514 chips online - but didn't
notice that I got the AP3 version instead of APL3... does
anyone know the difference? I can't seem to find any
data sheets online from a valid source (just the usual spam
sites)...











#yiv6460587043 #yiv6460587043 --
#yiv6460587043ygrp-mkp {
border:1px solid #d8d8d8;font-family:Arial;margin:10px
0;padding:0 10px;}

#yiv6460587043 #yiv6460587043ygrp-mkp hr {
border:1px solid #d8d8d8;}

#yiv6460587043 #yiv6460587043ygrp-mkp #yiv6460587043hd {
color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px
0;}

#yiv6460587043 #yiv6460587043ygrp-mkp #yiv6460587043ads {
margin-bottom:10px;}

#yiv6460587043 #yiv6460587043ygrp-mkp .yiv6460587043ad {
padding:0 0;}

#yiv6460587043 #yiv6460587043ygrp-mkp .yiv6460587043ad p {
margin:0;}

#yiv6460587043 #yiv6460587043ygrp-mkp .yiv6460587043ad a {
color:#0000ff;text-decoration:none;}
#yiv6460587043 #yiv6460587043ygrp-sponsor
#yiv6460587043ygrp-lc {
font-family:Arial;}

#yiv6460587043 #yiv6460587043ygrp-sponsor
#yiv6460587043ygrp-lc #yiv6460587043hd {
margin:10px
0px;font-weight:700;font-size:78%;line-height:122%;}

#yiv6460587043 #yiv6460587043ygrp-sponsor
#yiv6460587043ygrp-lc .yiv6460587043ad {
margin-bottom:10px;padding:0 0;}

#yiv6460587043 #yiv6460587043actions {
font-family:Verdana;font-size:11px;padding:10px 0;}

#yiv6460587043 #yiv6460587043activity {
background-color:#e0ecee;float:left;font-family:Verdana;font-size:10px;padding:10px;}

#yiv6460587043 #yiv6460587043activity span {
font-weight:700;}

#yiv6460587043 #yiv6460587043activity span:first-child {
text-transform:uppercase;}

#yiv6460587043 #yiv6460587043activity span a {
color:#5085b6;text-decoration:none;}

#yiv6460587043 #yiv6460587043activity span span {
color:#ff7900;}

#yiv6460587043 #yiv6460587043activity span
.yiv6460587043underline {
text-decoration:underline;}

#yiv6460587043 .yiv6460587043attach {
clear:both;display:table;font-family:Arial;font-size:12px;padding:10px
0;width:400px;}

#yiv6460587043 .yiv6460587043attach div a {
text-decoration:none;}

#yiv6460587043 .yiv6460587043attach img {
border:none;padding-right:5px;}

#yiv6460587043 .yiv6460587043attach label {
display:block;margin-bottom:5px;}

#yiv6460587043 .yiv6460587043attach label a {
text-decoration:none;}

#yiv6460587043 blockquote {
margin:0 0 0 4px;}

#yiv6460587043 .yiv6460587043bold {
font-family:Arial;font-size:13px;font-weight:700;}

#yiv6460587043 .yiv6460587043bold a {
text-decoration:none;}

#yiv6460587043 dd.yiv6460587043last p a {
font-family:Verdana;font-weight:700;}

#yiv6460587043 dd.yiv6460587043last p span {
margin-right:10px;font-family:Verdana;font-weight:700;}

#yiv6460587043 dd.yiv6460587043last p
span.yiv6460587043yshortcuts {
margin-right:0;}

#yiv6460587043 div.yiv6460587043attach-table div div a {
text-decoration:none;}

#yiv6460587043 div.yiv6460587043attach-table {
width:400px;}

#yiv6460587043 div.yiv6460587043file-title a, #yiv6460587043
div.yiv6460587043file-title a:active, #yiv6460587043
div.yiv6460587043file-title a:hover, #yiv6460587043
div.yiv6460587043file-title a:visited {
text-decoration:none;}

#yiv6460587043 div.yiv6460587043photo-title a,
#yiv6460587043 div.yiv6460587043photo-title a:active,
#yiv6460587043 div.yiv6460587043photo-title a:hover,
#yiv6460587043 div.yiv6460587043photo-title a:visited {
text-decoration:none;}

#yiv6460587043 div#yiv6460587043ygrp-mlmsg
#yiv6460587043ygrp-msg p a span.yiv6460587043yshortcuts {
font-family:Verdana;font-size:10px;font-weight:normal;}

#yiv6460587043 .yiv6460587043green {
color:#628c2a;}

#yiv6460587043 .yiv6460587043MsoNormal {
margin:0 0 0 0;}

#yiv6460587043 o {
font-size:0;}

#yiv6460587043 #yiv6460587043photos div {
float:left;width:72px;}

#yiv6460587043 #yiv6460587043photos div div {
border:1px solid
#666666;height:62px;overflow:hidden;width:62px;}

#yiv6460587043 #yiv6460587043photos div label {
color:#666666;font-size:10px;overflow:hidden;text-align:center;white-space:nowrap;width:64px;}

#yiv6460587043 #yiv6460587043reco-category {
font-size:77%;}

#yiv6460587043 #yiv6460587043reco-desc {
font-size:77%;}

#yiv6460587043 .yiv6460587043replbq {
margin:4px;}

#yiv6460587043 #yiv6460587043ygrp-actbar div a:first-child {
margin-right:2px;padding-right:5px;}

#yiv6460587043 #yiv6460587043ygrp-mlmsg {
font-size:13px;font-family:Arial, helvetica, clean,
sans-serif;}

#yiv6460587043 #yiv6460587043ygrp-mlmsg table {
font-size:inherit;font:100%;}

#yiv6460587043 #yiv6460587043ygrp-mlmsg select,
#yiv6460587043 input, #yiv6460587043 textarea {
font:99% Arial, Helvetica, clean, sans-serif;}

#yiv6460587043 #yiv6460587043ygrp-mlmsg pre, #yiv6460587043
code {
font:115% monospace;}

#yiv6460587043 #yiv6460587043ygrp-mlmsg * {
line-height:1.22em;}

#yiv6460587043 #yiv6460587043ygrp-mlmsg #yiv6460587043logo {
padding-bottom:10px;}


#yiv6460587043 #yiv6460587043ygrp-msg p a {
font-family:Verdana;}

#yiv6460587043 #yiv6460587043ygrp-msg
p#yiv6460587043attach-count span {
color:#1E66AE;font-weight:700;}

#yiv6460587043 #yiv6460587043ygrp-reco
#yiv6460587043reco-head {
color:#ff7900;font-weight:700;}

#yiv6460587043 #yiv6460587043ygrp-reco {
margin-bottom:20px;padding:0px;}

#yiv6460587043 #yiv6460587043ygrp-sponsor #yiv6460587043ov
li a {
font-size:130%;text-decoration:none;}

#yiv6460587043 #yiv6460587043ygrp-sponsor #yiv6460587043ov
li {
font-size:77%;list-style-type:square;padding:6px 0;}

#yiv6460587043 #yiv6460587043ygrp-sponsor #yiv6460587043ov
ul {
margin:0;padding:0 0 0 8px;}

#yiv6460587043 #yiv6460587043ygrp-text {
font-family:Georgia;}

#yiv6460587043 #yiv6460587043ygrp-text p {
margin:0 0 1em 0;}

#yiv6460587043 #yiv6460587043ygrp-text tt {
font-size:120%;}

#yiv6460587043 #yiv6460587043ygrp-vital ul li:last-child {
border-right:none !important;
}
#yiv6460587043

On Sat, 2/6/16, jw_dewdney@yahoo.com [PolySix] <PolySix@yahoogroups.com> wrote:

Subject: [PolySix] Re: POLYSIX SRAM CHIP REPLACEMENT?
To: PolySix@yahoogroups.com
Date: Saturday, February 6, 2016, 3:32 PM


 









Thanks Bob - no that's QUITE a convincing
argument/explanation... I'll get the APLs instead...
anyone had any experience with cooking their SRAM chips?? or
are there any good tests to find out? I guess checking patch
storage etc would be the obvious - but not sure if there are
better/more critical tests?

I was hoping chip quik would work for
extracting these but it's useless without a decent
extraction tool - which I'm trying to get my hands on...
(open to suggestions on this too!)









#yiv8765232817 #yiv8765232817 --
#yiv8765232817ygrp-mkp {
border:1px solid #d8d8d8;font-family:Arial;margin:10px
0;padding:0 10px;}

#yiv8765232817 #yiv8765232817ygrp-mkp hr {
border:1px solid #d8d8d8;}

#yiv8765232817 #yiv8765232817ygrp-mkp #yiv8765232817hd {
color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px
0;}

#yiv8765232817 #yiv8765232817ygrp-mkp #yiv8765232817ads {
margin-bottom:10px;}

#yiv8765232817 #yiv8765232817ygrp-mkp .yiv8765232817ad {
padding:0 0;}

#yiv8765232817 #yiv8765232817ygrp-mkp .yiv8765232817ad p {
margin:0;}

#yiv8765232817 #yiv8765232817ygrp-mkp .yiv8765232817ad a {
color:#0000ff;text-decoration:none;}
#yiv8765232817 #yiv8765232817ygrp-sponsor
#yiv8765232817ygrp-lc {
font-family:Arial;}

#yiv8765232817 #yiv8765232817ygrp-sponsor
#yiv8765232817ygrp-lc #yiv8765232817hd {
margin:10px
0px;font-weight:700;font-size:78%;line-height:122%;}

#yiv8765232817 #yiv8765232817ygrp-sponsor
#yiv8765232817ygrp-lc .yiv8765232817ad {
margin-bottom:10px;padding:0 0;}

#yiv8765232817 #yiv8765232817actions {
font-family:Verdana;font-size:11px;padding:10px 0;}

#yiv8765232817 #yiv8765232817activity {
background-color:#e0ecee;float:left;font-family:Verdana;font-size:10px;padding:10px;}

#yiv8765232817 #yiv8765232817activity span {
font-weight:700;}

#yiv8765232817 #yiv8765232817activity span:first-child {
text-transform:uppercase;}

#yiv8765232817 #yiv8765232817activity span a {
color:#5085b6;text-decoration:none;}

#yiv8765232817 #yiv8765232817activity span span {
color:#ff7900;}

#yiv8765232817 #yiv8765232817activity span
.yiv8765232817underline {
text-decoration:underline;}

#yiv8765232817 .yiv8765232817attach {
clear:both;display:table;font-family:Arial;font-size:12px;padding:10px
0;width:400px;}

#yiv8765232817 .yiv8765232817attach div a {
text-decoration:none;}

#yiv8765232817 .yiv8765232817attach img {
border:none;padding-right:5px;}

#yiv8765232817 .yiv8765232817attach label {
display:block;margin-bottom:5px;}

#yiv8765232817 .yiv8765232817attach label a {
text-decoration:none;}

#yiv8765232817 blockquote {
margin:0 0 0 4px;}

#yiv8765232817 .yiv8765232817bold {
font-family:Arial;font-size:13px;font-weight:700;}

#yiv8765232817 .yiv8765232817bold a {
text-decoration:none;}

#yiv8765232817 dd.yiv8765232817last p a {
font-family:Verdana;font-weight:700;}

#yiv8765232817 dd.yiv8765232817last p span {
margin-right:10px;font-family:Verdana;font-weight:700;}

#yiv8765232817 dd.yiv8765232817last p
span.yiv8765232817yshortcuts {
margin-right:0;}

#yiv8765232817 div.yiv8765232817attach-table div div a {
text-decoration:none;}

#yiv8765232817 div.yiv8765232817attach-table {
width:400px;}

#yiv8765232817 div.yiv8765232817file-title a, #yiv8765232817
div.yiv8765232817file-title a:active, #yiv8765232817
div.yiv8765232817file-title a:hover, #yiv8765232817
div.yiv8765232817file-title a:visited {
text-decoration:none;}

#yiv8765232817 div.yiv8765232817photo-title a,
#yiv8765232817 div.yiv8765232817photo-title a:active,
#yiv8765232817 div.yiv8765232817photo-title a:hover,
#yiv8765232817 div.yiv8765232817photo-title a:visited {
text-decoration:none;}

#yiv8765232817 div#yiv8765232817ygrp-mlmsg
#yiv8765232817ygrp-msg p a span.yiv8765232817yshortcuts {
font-family:Verdana;font-size:10px;font-weight:normal;}

#yiv8765232817 .yiv8765232817green {
color:#628c2a;}

#yiv8765232817 .yiv8765232817MsoNormal {
margin:0 0 0 0;}

#yiv8765232817 o {
font-size:0;}

#yiv8765232817 #yiv8765232817photos div {
float:left;width:72px;}

#yiv8765232817 #yiv8765232817photos div div {
border:1px solid
#666666;height:62px;overflow:hidden;width:62px;}

#yiv8765232817 #yiv8765232817photos div label {
color:#666666;font-size:10px;overflow:hidden;text-align:center;white-space:nowrap;width:64px;}

#yiv8765232817 #yiv8765232817reco-category {
font-size:77%;}

#yiv8765232817 #yiv8765232817reco-desc {
font-size:77%;}

#yiv8765232817 .yiv8765232817replbq {
margin:4px;}

#yiv8765232817 #yiv8765232817ygrp-actbar div a:first-child {
margin-right:2px;padding-right:5px;}

#yiv8765232817 #yiv8765232817ygrp-mlmsg {
font-size:13px;font-family:Arial, helvetica, clean,
sans-serif;}

#yiv8765232817 #yiv8765232817ygrp-mlmsg table {
font-size:inherit;font:100%;}

#yiv8765232817 #yiv8765232817ygrp-mlmsg select,
#yiv8765232817 input, #yiv8765232817 textarea {
font:99% Arial, Helvetica, clean, sans-serif;}

#yiv8765232817 #yiv8765232817ygrp-mlmsg pre, #yiv8765232817
code {
font:115% monospace;}

#yiv8765232817 #yiv8765232817ygrp-mlmsg * {
line-height:1.22em;}

#yiv8765232817 #yiv8765232817ygrp-mlmsg #yiv8765232817logo {
padding-bottom:10px;}


#yiv8765232817 #yiv8765232817ygrp-msg p a {
font-family:Verdana;}

#yiv8765232817 #yiv8765232817ygrp-msg
p#yiv8765232817attach-count span {
color:#1E66AE;font-weight:700;}

#yiv8765232817 #yiv8765232817ygrp-reco
#yiv8765232817reco-head {
color:#ff7900;font-weight:700;}

#yiv8765232817 #yiv8765232817ygrp-reco {
margin-bottom:20px;padding:0px;}

#yiv8765232817 #yiv8765232817ygrp-sponsor #yiv8765232817ov
li a {
font-size:130%;text-decoration:none;}

#yiv8765232817 #yiv8765232817ygrp-sponsor #yiv8765232817ov
li {
font-size:77%;list-style-type:square;padding:6px 0;}

#yiv8765232817 #yiv8765232817ygrp-sponsor #yiv8765232817ov
ul {
margin:0;padding:0 0 0 8px;}

#yiv8765232817 #yiv8765232817ygrp-text {
font-family:Georgia;}

#yiv8765232817 #yiv8765232817ygrp-text p {
margin:0 0 1em 0;}

#yiv8765232817 #yiv8765232817ygrp-text tt {
font-size:120%;}

#yiv8765232817 #yiv8765232817ygrp-vital ul li:last-child {
border-right:none !important;
}
#yiv8765232817

 

Thanks Bob - no that's QUITE a convincing argument/explanation... I'll get the APLs instead... anyone had any experience with cooking their SRAM chips?? or are there any good tests to find out? I guess checking patch storage etc would be the obvious - but not sure if there are better/more critical tests?

I was hoping chip quik would work for extracting these but it's useless without a decent extraction tool - which I'm trying to get my hands on... (open to suggestions on this too!)

Please allow me throw in a few more words.

Reading the datasheet carefully you will find that the currents so far discussed are maximum currents - maximum in the sense of among a large group of samples. The typical current is 0.05uA, even for the non-'L' variants. The L variants seem to be just screened to meet lower maximum current specs.

These currents are listed Under conditions of VDD = 5V and Ta=85C

On the last page you can see how IDDS (standby current) goes up exponentially with temperature, from about 200nA at 85C down to just 4nA at room temperature (20C).

So you may actually have trouble to even measure these 4nA with hobbyist measurement Equipment.

With such current your 125mAh battery will last 3000 years ... theoretically. In reality the battery has it's own leakage current we don't know here.

So unless your ammeter can really measure something of uA's your safe to use even the non 'L' parts.

Ah, and another point touched before: the battery is only serving current to the SRAM and one more CMOS logic gate 14011, IC25. While the synth is not powerd, the other parts are separated from that supply through D15.

Cheers

>
>
> Thanks Bob - no that's QUITE a convincing argument/explanation... I'll
> get the APLs instead... anyone had any experience with cooking their
> SRAM chips?? or are there any good tests to find out? I guess checking
> patch storage etc would be the obvious - but not sure if there are
> better/more critical tests?
>
> I was hoping chip quik would work for extracting these but it's useless
> without a decent extraction tool - which I'm trying to get my hands
> on... (open to suggestions on this too!)
>
>

>
>
> That's cool Roman. I assume you can't buy the original SRAM in SMD, so
> it must e much larger. Any chance there is banking allowed for? ;-)
>
> GB
>
>