What type of RAM is this?

[jamma-plusser]

Can't seem to find a datasheet for this one, it's in a PCB from 2003

HY62WT081ED55C


Thanks

 

[Eeyore]

jamma-plusser wrote:

Can't seem to find a datasheet for this one, it's in a PCB from 2003

HY62WT081ED55C

At an inspired guess it's made by Hyundai. That might help.

Graham

 

[jamma-plusser]

On Mon, 08 Dec 2008 21:51:54 +0000, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:

Thanks guys. Should have said that it's 28-pin surface mount. I THINK

it's a standard 62256 ( 32K * 8 ) but am not 100% certain.

Going off at a tangent, what's a good, cheap, modern equivalent of the
62256 ?

 

[Franc Zabkar]

On Mon, 08 Dec 2008 19:08:16 GMT, jamma-plusser@hotmail.com
(jamma-plusser) put finger to keyboard and composed:

Can't seem to find a datasheet for this one, it's in a PCB from 2003

HY62WT081ED55C

Even though the part is marked as "HY62WT081E", the actual part number
is "HY62WT08081E".

Here is a datasheet for the HY62WT08081E series:
http://www.datasheets.org.uk/pdf/1669143.pdf

Page 13 of the datasheet decodes the part number as ...

HY62WT081E = part name, 2.7~5.5V
D = Low Low Power
55 = 55ns @ 4.5~5.5V, 70ns @ 2.7~3.6V
C = Commercial (0 ~ 70 °C)

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

 

[jamma-plusser]

On Wed, 10 Dec 2008 14:50:41 +1100, Franc Zabkar
<fzabkar@iinternode.on.net> wrote:

Even though the part is marked as "HY62WT081E", the actual part number
is "HY62WT08081E".

Here is a datasheet for the HY62WT08081E series:
http://www.datasheets.org.uk/pdf/1669143.pdf

Page 13 of the datasheet decodes the part number as ...

HY62WT081E = part name, 2.7~5.5V
D = Low Low Power
55 = 55ns @ 4.5~5.5V, 70ns @ 2.7~3.6V
C = Commercial (0 ~ 70 °C)

Excellent, many thanks for that. So why didn't the put complete number
on the chip? For security purposes? It looks like the whole number
could have been accomodated.

Much appreciated anyhow - looks like it's compatible with the 62256,
etc.

 

[Franc Zabkar]

On Wed, 10 Dec 2008 10:08:56 GMT, jamma-plusser@hotmail.com
(jamma-plusser) put finger to keyboard and composed:

On Wed, 10 Dec 2008 14:50:41 +1100, Franc Zabkar
fzabkar@iinternode.on.net> wrote:


Even though the part is marked as "HY62WT081E", the actual part number
is "HY62WT08081E".

Here is a datasheet for the HY62WT08081E series:
http://www.datasheets.org.uk/pdf/1669143.pdf

Page 13 of the datasheet decodes the part number as ...

HY62WT081E = part name, 2.7~5.5V
D = Low Low Power
55 = 55ns @ 4.5~5.5V, 70ns @ 2.7~3.6V
C = Commercial (0 ~ 70 °C)

Excellent, many thanks for that. So why didn't the put complete number
on the chip? For security purposes? It looks like the whole number
could have been accomodated.

When AdrianC posted the URL of the "Hynix part number decoder", I
thought that your number was missing an additional "08" code for the
capacity, so I searched for "HY62WT08081".

It may be instructive to see how other 8-bit Hynix SRAMs are marked.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.