NXP PCA9570 - 4-bit IO expander : weekend die-shot

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.



After (terrible) metal etch - we see IO transistors right under pads: