NXP PCA9570 is an I²C 4-bit IO expander, although there are 4 unused pads on the die: probably 8-bit version uses the same die. 800nm technology.
Die size 589x600 µm.
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After (terrible) metal etch - we see IO transistors right under pads:
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Die size 589x600 µm.
After (terrible) metal etch - we see IO transistors right under pads:
