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PST529
From SnesLab

The PST529 serves as the SNES' voltage supervisor. It is labeled "RESET IC" in the block diagram in the official Nintendo documentation. [1]
See Also
References
- Figure 2-22-1, "Super NES Functional Block Diagram" on page 2-22-2 of Book I
- datasheet: https://datasheetspdf.com/pdf-file/515960/MitsumiElectric/PST529/1