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As a side note, the M25P40 part from Micron/Numonyx is a drop-in replacement for an EPCS4 and supports 2.3V to 3.6V.
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No they don't go down to 2.3V (at least any of the device data sheets I've looked at).
I was recently stumped with some recent experiments to prove an M25P16 was an acceptable replacement for a Spansion part that was
going obsolete. After much hair pulling I realised I'd set the supply to the config prom wrongly, it was at ~2.2V. The Spansion
part worked but the M25P16 didn't. The M25P data sheet said >2.7V, when I fixed the supply to 2.8V it worked finw.
I'd be keen to find an EPCS16 substitute that works down to 2.5V, what parts were you looking at?
Nial.
Honored Contributor
