Skywater130 Standard Cells
Factory libraries:
- sky130_fd_sc_hs - High speed digital standard cells
- sky130_fd_sc_ms - Medium speed digital standard cells
- sky130_fd_sc_ls - Low speed digital standard cells
- sky130_fd_sc_hd - High density digital standard cells
- sky130_fd_sc_hdll - High density low leakage digital standard cells
Important note: The layouts for the high-speed, medium-speed and low-speed cells are nearly identical. Only the doping changes.[1]
Overview
These libraries populate the speed/power/density tradeoff space, support high voltage interfacing and provide for low power standby logic when the main parts of a chip are put to sleep.[1]
The high-density library uses smaller transistors that are more heavily doped to keep their performance up. This results in higher leakage, hence the provision of a low-leakage library where speed can be traded.[1]
The cells all work down to 1.2v. The maximum voltage is 1.8v for all except the high-voltage library (5v).[1]