Electronics > Repair

Has anyone replaced HP8591(E) SRAM by FRAM?

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Greybeard:
OK, that sounds “a little” more difficult than I had hoped…  :-\

Miti:

--- Quote from: Greybeard on December 15, 2024, 12:33:33 am ---OK, that sounds “a little” more difficult than I had hoped…  :-\

--- End quote ---

Looking at Motorola 68000, looks like it needs a minimum of 4 clock cycles for a write so I think we are safe.
If my calculations are correct, the write cycle time is about 271nS. Same for reading.

squadchannel:
WE,OE? will probably conflict. if they don't conflict, could use a 16Bit FM22L16, but have to build a board that straddles the two ROMs. not my preference. :scared:
also, yeah, it slow.

my choice the 90ns FM28V100, but at $40(each $10). >:D
used to be able to get it for $10, but it's getting so expensive. jlc sell $10.

Miti:
Does anybody knows an IC that can delay a falling edge of a digital signal with minimum delay on the rising edge?

Thanks,
Miti

Miti:
I have a preliminary schematic. Can you please review and comment? What's missing is a supervisor.

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