Electronics > Beginners
Trying to find old 8k sram chips for HP-75c calculator pod
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oPossum:
Ceramic capacitor.

Probably 100 nF, 0805 size
oPossum:
Breakdown of your original part # HM6264LFP-15

HM = Hitachi
6264 = 8k SRAM
L = Low power
FP = SOIC plastic package
15 = 150 ns
Kjelt:
If you are certain you need those and absolutely can't find any other source I am willing to part from this beauty  :'( , but you have to unsolder the ICs your self.

https://www.eevblog.com/forum/vintage-computing/pictures-of-vintage-ics/msg1438341/#msg1438341
RichardM:
Thanks for the offer. How much do you want for the 3 sram chips ?

Can I ask whether the speed on these (i.e. 15T or 12T) etc is referring to access time (or a better word?) Or actuals speed ? Is 15 "faster" than 12 or 10 ?

Also, do i need to use ceramic capacitors ?

What can go wrong I hear you say :)

Regards

Richard
Kjelt:

--- Quote from: RichardM on June 09, 2019, 05:09:32 am ---Thanks for the offer. How much do you want for the 3 sram chips ?
--- End quote ---
If you are going to use them it will be postage  ;)



--- Quote ---Can I ask whether the speed on these (i.e. 15T or 12T) etc is referring to access time (or a better word?) Or actuals speed ? Is 15 "faster" than 12 or 10 ?
--- End quote ---
AFAIK -15 = 150ns -12 = 120ns etc


--- Quote ---Also, do i need to use ceramic capacitors ?
--- End quote ---
I thought it was a one on one replacement of the hp chips but you want to expand your memory on your device? Then you need to add some ceramic caps probably 100nF to 200nF will suffice since these are very low power.
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