| SONOS cells |
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| The SKY130 process currently supports two SONOS flash memory cells: |
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| - The original cell is supported in the S8PFHD, S8PHRC and S8PFN-20 technology options, with operating temperatures from -55°C to +155°C |
| - The “star” cell is supported in the S8PHIRS technology option. Its cell size is approximately 25% smaller than the original cell, but its temperature range is restricted to -40°C to +125°C. |
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| Spice models for the memory cells exist for multiple conditions: |
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| .. include:: special_sonosfet-table0.rst |
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| Program and Erase characteristics are described in more detail in the ***S8 Nonvolatile Technology Spec*** (001-08712), and summarized below: |
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| .. include:: special_sonosfet-table1.rst |
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| Endurance behavior is illustrated below (100K cycles guaranteed): |
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| |sonos-erase-program| |
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| Data retention behavior is shown below at 85C\ |sonos-data-retention| |
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| E-test parameters are summarized below for both original and star cells: |
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| .. include:: special_sonosfet-table2.rst |
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| The schematic for the 2-T SONOS memory cell is shown below: |
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| |schematic-sonos-cell| |
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| The cross-section of the 2-T SONOS cell is shown below. |
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| |cross-section-sonos-cell| |
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| .. |sonos-erase-program| image:: sonos-erase-program.svg |
| .. |sonos-data-retention| image:: sonos-data-retention.svg |
| .. |schematic-sonos-cell| image:: schematic-sonos-cell.svg |
| .. |cross-section-sonos-cell| image:: cross-section-sonos-cell.svg |
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