This cell is a 32kHz cyrstal oscillator (2^15 Hz) powered by a one-Farad super cap. During low-power operation the cell draws less that 2 uA over a power supply range of 2.7 to 4.3 V allowing it to operate for more than 200 hours. Off-chip components include a 10 MEG resistor and the crystal (and the cap). During normal operation the cell can be put into a high-power mode of operation to increase the cells immunity to power supply and ground noise. The cell was designed using Tower's 0.6 um CMOS process.

Below is a picture of the cell layout

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