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AN1012 Datasheet(PDF) 19 Page - STMicroelectronics |
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AN1012 Datasheet(HTML) 19 Page - STMicroelectronics |
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19 / 33 page  AN1012 Supervisor products Doc ID 6395 Rev 4 19/33 6 Supervisor products STMicroelectronics also has a family of ZEROPOWER® and TIMEKEEPER® supervisor devices. Supervisors are self-contained units that allow standard low-power SRAMs to be turned into non-volatile memory devices. They monitor and provide VCC input for one or more external SRAMs the same way ZEROPOWER and TIMEKEEPER products do. They use a precision voltage reference and comparator to monitor the VCC input for going out-of- tolerance. When VCC becomes invalid, the supervisor’s conditioned chip-enable outputs (ECON) are forced to their “inactive” state, thereby putting each external SRAM into its own write-protect state. During the power failure, the supervisor provides the power for the SRAM from the lithium cell within its SNAPHAT top. The supervisor switches the power source back to the VCC supply as soon as the voltage returns to specified levels. |
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