Hi everyone,
I’m working on a custom board design using an STM32H753AII6 in the UFBGA169 package. I need to include external SDRAM but want to keep my PCB footprint as small as possible, so I’m leaning toward a BGA-packaged SDRAM rather than the typical TSOP.
Right now, I’m looking at the Micron MT48LC16M16A2B4-6A (which I believe is a 256 Mbit / 16-bit SDRAM, rated up to around 166 MHz). My plan is to run it in 16-bit mode at about 100–133 MHz using the STM32’s FMC SDRAM interface.
A few questions I have:
- Is the MT48LC16M16A2B4-6A a good choice for this processor/package if I want a small BGA footprint?
- Are there other similar BGA SDRAM parts I should consider that might be easier to source or have better lead times? Something you guys have good experience with.
- Do you have any layout tips (length matching, decoupling, etc.) when placing a BGA SDRAM so close to a BGA microcontroller?
- Any gotchas or lessons learned you guys learned using STM32H7 with BGA SDRAM?
I’m fairly new to designing with BGA packages, so any advice or references to example schematics (especially using the STM32H7 in a BGA form factor) would be really appreciated. I have checked the STM32H753I-EVAL design, however it is using 32bit SDRAM rathern than a 16bit option.
Thank you in advance for your help!
