With 343 user I/O and 516096 bits of embedded RAM, it targets cost-sensitive medium-density applications.
I/O and package — the routing constraint
343 I/O pins force the 484-FBGA (23x23 mm) footprint. No smaller BGA or QFP variant exists for this density tier, so the board requires at least a four-layer stack-up to escape the balls. The supplier device package is 484-FBGA (23x23); plan for via-in-pad or microvia if routing density is tight. Surface-mount only — no socket option for prototyping without an adapter.
