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I'm afraid I can't help you with sourcing K3 chips, but I'm curious as to the board layout differences required for the M mask chips?
I did a board design a few years ago which used the K3 chip, and if I need to change it I'd like to understand why...
--- In MPC500@..., "cam13831" <cam13831@...> wrote:
> Good Morning,
> We are trying to source older MPC555 chips. Specifically we are looking
> for MPC555LFMZP40 with the K3 mask (Mask Set 6K02A, 1K83H, 3K83H,
> 5K83H). We have tried several places and have had no luck and
> unfortunately our current board layout does not allow us to do
> modifications at this time to use the later M mask.
> So I guess we were wondering if anyone would have any recommendations as
> to where we might be able to find someone that would have a supply of
> older stock (we are only looking for around 10 chips).
> Thanks and have a great day.