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 Post subject: Replace Frontloader SRAM
PostPosted: Tue May 31, 2016 7:33 am 
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Joined: Sun May 22, 2016 9:29 am
Posts: 9
Hi!

I might have to change a broken Ram GM76C28..
Is a GM76C28A compatible?

i checked the datasheets and the GM76C28A Version counts the i/o pins from 0-8
and the other one from 1-7... does this matter?

farnell.com/datasheets/100676.pdf
datasheetarchive.com/dlmain/Datasheets-110/DSAP0015952.pdf

Rgds Dario


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PostPosted: Tue May 31, 2016 9:44 am 
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Joined: Sun Apr 13, 2008 11:12 am
Posts: 6277
Location: Seattle
The 24-pin 2 KiB RAMs are a standardized pinout. You are unlikely to be able to find one that's incompatible.

But, as long as it looks like:

Pins 1-8, 19, 22, 23: address pins
Pins 9-11, 13-17: data pins
pins 12,18,20,21,24: in order: gnd, /cs, /oe, (r)//w, vcc

It's compatible.


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PostPosted: Tue May 31, 2016 10:25 am 
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Joined: Sun May 22, 2016 9:29 am
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Thats what i wanted to hear.

Thank you!


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PostPosted: Wed Jun 01, 2016 5:44 am 
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Joined: Sun May 22, 2016 9:29 am
Posts: 9
The RAM is fine.. it wasnt broken

i changed the 74LS and its working again!


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